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HU, CHENG, SHUANG-LAI LI, YAN QIAO, DONG-HAI LIU i YUN-FENG CHEN. "EFFECTS OF 30 YEARS REPEATED FERTILIZER APPLICATIONS ON SOIL PROPERTIES, MICROBES AND CROP YIELDS IN RICE–WHEAT CROPPING SYSTEMS". Experimental Agriculture 51, nr 3 (18.11.2014): 355–69. http://dx.doi.org/10.1017/s0014479714000350.
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SUMMARYLong-term fertilization experiment has been conducted since 1981 to study the effect of soil management practices on soil fertility, soil carbon and nitrogen sequestration, soil culturable microbe counts and crop yields at the Nanhu Experimental Station in the Hubei Academy of Agricultural Sciences (situated in the middle reach of the Yangtze River and the rice–wheat cropping system). The experiment was designed with the following eight treatments: (1) unfertilized treatment: Control; (2) inorganic nitrogen fertilizer treatment: N; (3) inorganic nitrogen plus inorganic phosphorus fertilizer treatment: NP; (4) inorganic nitrogen, inorganic phosphorus plus inorganic potassium fertilizer treatment: NPK; (5) pig dung compost (manure) treatment: M; (6) inorganic nitrogen fertilizer plus manure: NM; (7) inorganic nitrogen, inorganic phosphorus fertilizer plus manure treatment: NPM and (8) inorganic nitrogen, inorganic phosphorus, inorganic potassium fertilizer plus manure treatment: NPKM. The results showed that long-term application of organic manure in combination with inorganic fertilizer significantly (p < 0.05) increased soil organic C concentrations compared with the corresponding inorganic fertilizers alone. Soil organic C contents were significantly (p < 0.05) increased in balanced application of NPK fertilizers in comparison to unbalanced application of fertilizers. After 30 years of experiment, soil organic C and total N sequestration rate averagely were 0.48 t ha−1 year−1 and 28.3 kg ha−1 year−1 in the fertilized treatments respectively; nevertheless, it were 0.27 t ha−1 year−1 and 9.7 kg ha−1 year−1 in the unfertilized treatment. Application of organic fertilizer in combination with inorganic fertilizer significantly (p < 0.05) increased culturable microbial counts compared with the corresponding inorganic fertilizers alone. The balanced application of NPK fertilizers significantly (p < 0.05) increased culturable microbial counts compared with unbalanced application of fertilizers. The average grain yield of wheat and rice was significantly (p < 0.05) higher in organic manure combined with inorganic fertilizer treatment than in inorganic fertilizer alone and unfertilized control. Therefore, long-term application of organic manure combined with inorganic fertilizer and balanced application of NPK fertilizers could increase soil organic C and total N sequestration, culturable microbial counts and crop grain yields.
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Eaton, L. J., K. R. Sanderson i S. A. E. Fillmore. "Comparison of consecutive and alternate fertilizer applications in wild blueberry production". Canadian Journal of Plant Science 89, nr 1 (1.01.2009): 93–98. http://dx.doi.org/10.4141/cjps08068.
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Research has shown that improved nutrient uptake and yield of wild blueberries (Vaccinium angustifolium Ait) are very sporadic when fertilizers are applied. Growers are concerned with environment impacts and keeping fertilizer costs to a minimum. Two experiments were conducted to evaluate the response of wild blueberries to soil-applied fertilization over four cropping cycles in Prince Edward Island and Nova Scotia from 1997 to 2004. Commercial fertilizers (17-17-17, 1-46-0 and 13-26-5) were soil-applied in the sprout year either as a consecutive fertilizer application (every cropping cycle) or an alternate fertilizer application (every second cropping cycle). All fertilizers were applied at a rate of 200 kg ha-1. Fertilizer applications increased soil levels of P and K, leaf tissue concentrations of N and P and stem lengths of plants. Higher levels of soil P and leaf tissue concentrations of N, P and K were observed with consecutive than with alternate fertilizer applications. Average stem lengths, buds and blossoms per stem were higher over the length of the study when fertilizers were applied consecutively compared with alternately. Fruit yields were increased compared with the unfertilized control. Within applied fertilizers treatments, fruit yield was not affected when fertilizer was applied in either consecutive or alternate cropping cycles. Alternate fertilizer applications may reduce soil accumulation of P and production costs without comprising yields. Key words: Cropping cycles, fertilization, soil and tissue nutrients, yield
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Yin, Dawei, Xiangyu Yang, Haize Wang, Xiaohong Guo, Shiqiang Wang, Zhihui Wang, Guohua Ding i in. "Effects of chemical-based fertilizer replacement with biochar-based fertilizer on albic soil nutrient content and maize yield". Open Life Sciences 17, nr 1 (1.01.2022): 517–28. http://dx.doi.org/10.1515/biol-2022-0057.
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Abstract Biochar-based fertilizers are used to improve soil’s physiochemical and biological properties and increase fertilizer utilization rate. Therefore, a technological model of biochar-based fertilizers is essential for the reduced application. This study was conducted to determine the effects of the different levels of biochar-based fertilizer applications on soil and plant nutrient content, as well as maize yield. Biochar-based fertilizer increased the total N content of maize stem and kernel and the total P content of maize axis and kernel. Biochar-based fertilizer increased the total P but decreased the total K of maize plants while increasing the fertilizer’s partial productivity. Treatment B1 (600.00 kg hm−2 of biochar-based fertilizer) increased the dry-matter weight of the maize at silking and filling stages by 1.60 and 15.83%. Treatment B1 increased the ear length, diameter, and plant height. Compared with BCK (600.00 kg hm−2 of conventional fertilizer), the yield of B1 was increased by 9.23%, and the difference was significant (p < 0.05). Biochar-based fertilizer treatments B2–B5 (biochar-based fertilizer reduced by 5–20%) reduced maize yield, but there was no significant difference between their yield and BCK. This study aimed to provide a basic understanding and reference for maize fertilizer reduction with good application prospects.
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Paparozzi, Ellen T., i Harlene M. Hatterman. "Fertilizer Applications on Field-grown Statice". HortScience 23, nr 1 (luty 1988): 157–60. http://dx.doi.org/10.21273/hortsci.23.1.157.
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Abstract Three cultivars of annual statice (Limonium sinuatum mill, and L. bonduelli Kuntze) were grown in a fertile, silty clay loam field and fertilized with varying amounts of granular 12N–5.3P–10K. Mean individual stem weight, flower stem number, and mean and total fresh weight increased significantly due to fertilizer applications. Cultivar differences limited increases in rosette diameter, mean stem length, individual stem weight, and flower stem number. Field fertilizer application rates between 45.4 and 68.1 kg N/ha increased total fresh weight of ‘Iceberg’ and ‘Kampf's Blue’, but did not affect ‘Gold Coast’. Number of subsequent fertilizer applications beyond the initial application was not as critical as total amount applied.
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Wang, Manman, Youliang Ye, Xv Chu, Yanan Zhao, Shuhong Zhang, Hui Chen, Wei Qin i Yang Wang. "Responses of Garlic Quality and Yields to Various Types and Rates of Potassium Fertilizer Applications". HortScience 57, nr 1 (styczeń 2022): 72–80. http://dx.doi.org/10.21273/hortsci15984-21.
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Potassium (K) is a critical plant nutrient that determines quality in a myriad of crops and increases production yields. However, excessive application of various types of K fertilizers can decrease both the food quality and yields, which translates as economic losses and food safety issues. The objectives of this study were to 1) elucidate the impacts of different application rates of various K fertilizers on garlic, with the aim to identify the optimal and most economical K fertilizer dosage and 2) compare the effects of applying two common K fertilizers (KCl and K2SO4) on garlic, to determine the optimal combination. From 2018 to 2020, we utilized two distinct K-fertilized fields to conduct our experiments. The results revealed optimal KCl fertilization increased the biomass and vegetation index in garlic, and promoted the transfer of nitrogen, phosphorus, and potassium nutrients from the stem and leaf to bulb, thereby increasing bulb production. The application of KCl fertilizer increased the number of cloves, the diameters of the cloves and bulbs, and reduced variations in bulb size. In addition, the application of KCl fertilizer improved the nutritional quality (Vitamin C, soluble sugar, soluble protein, and allicin) of the garlic and reduced the accumulation of nitrate. However, excessive KCl fertilizer cause decreased yields, appearance traits, and nutritional quality. Applying the same rate of K fertilizer in the form of K2SO4 in isolation increased the garlic yield by only 0.1% to 22.5% when compared with KCl fertilizer. However, the results were not always significant. In this study, the highest yields, appearance traits, and nutritional quality were achieved with the ratio of K2SO4: KCl = 3:1. Consequently, to ensure the highest economic value (considering the market prices of K fertilizer, garlic sprouts, and bulbs), the authors recommend a K fertilizer rate of 252.5 kg·ha−1 K2O, with K2SO4 accounting for 61.6% for garlic production in field.
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Fahrurrozi, Zainal Muktamar i Sigit Sudjatmiko. "Agronomic Responses of Sweet Corn - Peanut Intercropping to Liquid Organic Fertilizer Grown in Different Dosages of Vermicompost". AGRIVITA Journal of Agricultural Science 45, nr 2 (1.06.2023): 220–30. http://dx.doi.org/10.17503/agrivita.v45i2.3902.
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Applying organic fertilizer and intercropping systems are among the techniques for preserving land sustainability in organic vegetable production systems. In organic vegetable production, the use of liquid organic fertilizer has been suggested in addition to the use of solid organic fertilizer. This study evaluates how growth and yields of sweet corn and peanuts grown utilizing row intercropping respond to different vermicomposting dosages. A factorial experiment is arranged using a split-plot design with three replicates. The main plot is vermicomposting dosages; 5, 10, 15, 20, and 25 Mg/ha, and the sub-plot was the applications of liquid organic fertilizer, not fertilized and fertilized with liquid organic fertilizer. Results show that the application of liquid organic fertilizer elevated plant height and leaf area, length, diameter, and weight of husked ears of sweet corn. Vermicomposting increased plant height, husked ear length, husked ear diameter, and husked ear fresh weight of sweet corn. Twenty Mg/ha is the best dosage for producing sweet corn intercropped with peanuts. However, using vermicompost and liquid organic fertilizers did not increase the growth and yields of peanuts. Evaluation of nutrient uptakes by intercropped crops, sweet corn, and peanut, in organic production systems, should be the subject of further study.
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Baghdadi, Ali, Ridzwan A. Halim, Ali Ghasemzadeh, Mohd Fauzi Ramlan i Siti Zaharah Sakimin. "Impact of organic and inorganic fertilizers on the yield and quality of silage corn intercropped with soybean". PeerJ 6 (26.10.2018): e5280. http://dx.doi.org/10.7717/peerj.5280.
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Background Corn silage is an important feed for intense ruminant production, but the growth of corn relies heavily on the use of chemical fertilizers. Sustainable crop production requires careful management of all nutrient sources available on a farm, particularly in corn-based cropping systems. Methods Experiments were conducted to determine the appropriate technique of corn-legume intercropping in conjunction with the supplemental use of chemical fertilizers, organic manure, and biofertilizers (BFs). Acetylene reduction assays (ARAs) were also performed on corn and soybean roots. Results Combining chemical fertilizers with chicken manure (CM) in a 50:50 ratio and applying 50% NPK+50% CM+BF produced fresh forage and dry matter (DM) yields that were similar to those produced in the 100% nitrogen (N), phosphorus (P), potassium (K) treatment. Among the lone fertilizer treatments, the inorganic fertilizer (100% NPK) treatment produced the highest DM yield (13.86 t/ha) of forage and outyielded the 100% CM (9.74 t/ha) treatment. However, when CM was combined with NPK, the resulting DM yield of forage (13.86 t/ha) was the same as that resulting from 100% NPK (13.68 t/ha). Compared with CM applications alone, combinations of NPK and CM applications resulted in increased plant height, crop growth rates (CGRs) and leaf area index (LAI), but the values of these parameters were similar to those resulting from 100% NPK application. Fertilizers in which the ratio was 50% CM+50% NPK or 50% CM+50% NPK+BF resulted in protein yields that were similar to those resulting from conventional fertilizers. Similarly, the CP content did not significantly differ between applications of the 100% NPK and 50% CM+50% NPK fertilizers. The use of BFs had no significant impact on improving either the yield or quality of forage fertilized with inorganic or organic fertilizer. Lactic acid responded differently to different fertilizer applications and was significantly higher in the fertilized plots than in the unfertilized plots. Compared with treatments of lone chemical and lone organic manure fertilizers, treatments involving applications of BF and a combination of BF and NPK or CM resulted in higher ARA values. Discussion There is no simple and easy approach to increase biological nitrogen fixation (BNF) in grain legumes grown as part of a cropping system under realistic farm field conditions. Overall, evidence recorded from this study proves that, compared with corn monocrops combined with CM and chemical fertilizers, corn-soybean intercrops could increase forage yields and quality, produce higher total protein yields, and reduce the need for protein supplements and chemical fertilizers.
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Negi, P., R. Thakur, K. Manral, K. Tomar, B. S. Rawat, B. Ramola i Waseem Ahmad. "Coated Controlled-Release Fertilizers: Potential Solution for Sustainable Agriculture". Nature Environment and Pollution Technology 21, nr 4 (1.12.2022): 1739–45. http://dx.doi.org/10.46488/nept.2022.v21i04.028.
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The use of fertilizer in the agricultural field is essential for plant growth but an excess amount of pure chemical contents in fertilizers becomes harmful to every living being. To reduce this chemical exposure, the use of materials coated with Controlled Release Fertilizers (CRFs) are being used. The coating of materials outside the fertilizer does not allow the chemicals to spread completely within one application of fertilizer but its spread can be extended as will be done in 2-3 applications of fertilizer. The features of the undercoating material are thus vital to attain this delayed or slow release of the nutrients present in the fertilizer. The longevity of CRFs depends upon the width of the material coating surrounding the fertilizer, temperature, and moisture. The review focuses on the consequences of conventional fertilizers, the need to control the release of fertilizers and types of coatings used, and their application in sustainable agriculture.
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Torres, Kenneth C. "Controlled-release Fertilizers Effect on the Growth of Bed-grown Woody Landscape Plants". HortScience 22, nr 6 (grudzień 1987): 1330. http://dx.doi.org/10.21273/hortsci.22.6.1330.
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Abstract The effects of controlled-released fertilizers in container production have been evaluated (1,2), but little work has been reported on the effects of controlled-released fertilizers for field production techniques. Surface band and pre-plant fertilizer incorporation are the most common application methods for field-grown landscape plants. The major drawback of current field application methods are applications must be repeated every 4 to 6 months and a considerable amount of fertilizer is used inefficiently. The purpose of this research was to evaluate the effects of preplant applications of controlled-released fertilizers on the growth of field-grown landscape plants.
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Aslani, Maryam, i Mohammad Kazem Souri. "Growth and Quality of Green Bean (Phaseolus vulgaris L.) under Foliar Application of Organic-Chelate Fertilizers". Open Agriculture 3, nr 1 (1.05.2018): 146–54. http://dx.doi.org/10.1515/opag-2018-0015.
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Abstract Organic-based chelate fertilizers can effectively improve nutrient uptake and use efficiency of plants. In the present study, foliar applications of three organic-chelate fertilizers on green bean (Phaseolus vulgaris L.) plants were compared to soil application of a mix chemical fertilizer (NPK) under greenhouse conditions. The treatments were foliar application (six sprays at 0.2% concentration) of Biomin, Humifolin, DelfonPlus, a mixture of micro and macronutrients, soil application of chemical fertilizer (NPK 0.5 g.kg-1 soil), and no fertilizer control. Foliar applications of organic-chelate fertilizers improved plant height, leaf area, shoot dry weight, leaf N and K concentration, pod number and pod yield compared to control plants. Pod soluble solids, vitamin C and total protein contents were significantly increased by foliar application of organic-chelate fertilizers. Soil applied NPK also improved green bean productivity compared to no fertilizer control. For most plant growth traits, there was no significant difference among the three organic-chelates. Foliar application of the macro- micro- nutrient mixture was not able to enhance the same growth, yield and pod quality traits like organic-chelates. Therefore, application of nutrient elements in form of organic-chelate and particularly by foliar application can guarantee better green bean plant performance.
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Ulusu, Funda, i Elif Yavuzaslanoğlu. "Örtü Altı Organik Domates Yetiştiriciliğinde Farklı Gübre Uygulamalarının Bitki Yeşil Aksamı ve Meyve Verimine Etkisi". Turkish Journal of Agriculture - Food Science and Technology 5, nr 13 (29.12.2017): 1757. http://dx.doi.org/10.24925/turjaf.v5i13.1757-1761.1538.
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Greenhouse tomato production is in the first place in Turkey, 34% of total tomato production (3.614.472 tonnes) is under greenhouse conditions. The increase in yield in Turkey is due to the spread of undergrowth cultivation besides the use of qualified varieties and seeds. Synthetic fertilizers can’t be used to obtain economic efficiency in underground organic tomato growing Therefore, the application of alternative fertilizers (barn stubble, green manure, organic fertilizer, vermicompost etc.) needs to be improved. For this purpose, effect of the eight different fertilizer combination including organic and worm liquid fertilizer, humic acid and mycorrhizae applications on tomato plant and fruit yield were investigated in the study. Negative check without any fertilizer application growing and a positive check; a synthetic liquid fertilizer application was included. Experiment was set up according to completely randomised block design with 3 replications under greenhouse conditions. Tomato fruit length, diameter and weight was determined as fruit yield and fresh and dry weight as plant yield. There was not any statistical difference among fertilizer applications for fruit and plant yield. However, the highest tomato fruit yield was obtained in the treatments of organic (7.17 kg/ plot) and worm fertilizers (4,80 kg/ plot) in combination with mycorrhizae. The results were similar for fruit diameter and length. Plant fresh and dry weight was between 2.01 to 5.92 and 0.368 to 1.153 kg, respectively. The highest plant weight was belong to mycorrhizae and organic fertilizer application.
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Zhou, Wenqi, Chao Song, Xiaobo Sun, Ziming Liu, Xue Ni, Kangjia Shen, Yi Jia Wang i Liquan Tian. "Design of High-Efficiency Soil-Returning Liquid Fertilizer Deep-Application Furrow Openers for Improving Furrowing Performance in Cold Regions of Northeast China". Agriculture 12, nr 9 (23.08.2022): 1286. http://dx.doi.org/10.3390/agriculture12091286.
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Liquid-fertilizer deep-application techniques are techniques for applying fertilizers to the root system of crops, which can effectively improve the utilization rate of fertilizers and reduce application amounts. Due to the soil viscosity of soils in the cold region of Northeast China, the soil return rate of furrow openers for liquid-fertilizer deep applications is low, which can easily cause excessive volatilizations of liquid fertilizers. Therefore, aiming at the operational requirements of low soil disturbance for liquid-fertilizer furrowing and deep applications, an efficient soil-returning liquid-fertilizer deep-application furrow opener was innovatively designed based on soil characteristics during the inter-cultivation period in the cold region of Northeast China. The discrete element method (DEM) was used to analyze the operating performance of the high-efficiency soil-returning liquid-fertilizer deep-application furrow openers, which is determined by key operating parameters including width and slip cutting angle. The DEM Virtual Simulation Experiment results show that the optimal combination is the width of 37.52 mm and a slip cutting angle of 43.27°, and the test results show that the optimal performance of the high-efficiency soil-returning liquid-fertilizer deep-application furrow opener is that the soil disturbance rate is 51.81%, and the soil-returning depth is 52.1 mm. This paper clarifies the relationship between the width and the slip cutting angle in furrowing resistance and soil disturbance and the mechanism by which the width and slip cutting angle affect soil disturbance. Above all, this study provides a theoretical and practical reference for the design of liquid-fertilizer deep-application furrow openers.
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Kelley, William Terry. "EVALUATION OF SLOW-RELEASE FERTILIZER MATERIALS ON SELECTED VEGETABLE CROPS". HortScience 40, nr 3 (czerwiec 2005): 887d—887. http://dx.doi.org/10.21273/hortsci.40.3.887d.
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Despite some advantages, adoption of slow-release fertilizers in vegetables has been slow primarily due to cost. In crops fertilized with ground equipment, growers can make fewer trips through the field and assure fertilizer is present when conditions prevent application. With drip irrigation, some materials are difficult to inject, however, Nitamin is a new injectable liquid produced by Georgia Pacific. Thus, with plasticulture, growers can inject less frequently and potentially use lower rates. Granular and liquid formulations of slow-release fertilizer were tested on onions (Winter 2003–04), cabbage (Winter 2003–04) and pepper (Spring 2004) in Georgia. Combinations of traditional fertilizer with slow-release formulations and various rates of slow-release fertilizer alone were compared to a standard fertilizer program on these crops in separate experiments. The slow-release contains only N. So, other nutrients were held constant. Otherwise normal cultural practices were employed. Crops were harvested at maturity and data collected on yield and quality. In cabbage, with at least 50% of the standard N rate using the slow-release fertilizer, yields were comparable to the standard. Results on onions were similar with N rates of at least 75% of the standard for the liquid material; the granular formulation did not perform well. Split applications of slow-release fertilizer and combinations with standard fertilizer worked well for cabbage, but not for onions. Results on pepper, although inconclusive, indicated it was possible to get comparable yields at lower N rates with the slow-release material. Based on these results, lower N rates are possible on cabbage and onions with slow-release fertilizers which may make them economically feasible while providing application advantages to growers.
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Stamps, Robert H. "EFFECTS OF CONTROLLED-RELEASE AND LIQUID FERTILIZATION ON LEATHERLEAF FERN AND NITROGEN LEACHING". HortScience 27, nr 6 (czerwiec 1992): 582f—583. http://dx.doi.org/10.21273/hortsci.27.6.582f.
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Established leatherleaf fern was grown for one year in a glasshouse in intact soil columns (Astatula fine sand, 21 × 61 cm) contained in drainage lysimeters. Columns were fertilized at rates of 224, 448, or 672 kg N ha-1 yr-1 using controlled-release (CR) fertilizer, either 360-day (360CR) or 180-day (180CR) term, or weekly applications of liquid (L) fertilizer. Water use, yield (number of harvestable fronds) and average frond weight increased linearly with increasing fertilization rate and more fronds were produced using L than CR fertilizers. Frond color measurements paralleled yield results. During cool weather when vase life is greatest, fronds from L fertilizer lysimeters lasted longer than fronds from CR treated plots. During warmer weather, treatments had no effect on vase life. Nitrate nitrogen (NO3-N) leaching increased with fertilization rate and exceeded 10 ppm in leachate from the L and 180CR treatments at all application rates. NO3-N in leachate from 360CR lysimeters never exceeded 8 ppm at any application rate.
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Arslanoglu, Şahane Funda. "The effects on the root and plant development of soybean of organic fertilizer applications". Bioscience Journal 38 (29.07.2022): e38036. http://dx.doi.org/10.14393/bj-v38n0a2022-60382.
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Organic fertilizers increase soil aeration, water and nutrient holding capacity, improve seed germination and encourage the production of thicker roots, increase the yield and quality of the crop. This study was aimed to determine the effects of organic fertilizer (vermicompost, sheep manure, cattle manure, poultry manure and inorganic fertilizer as control) applications on the root and plant development of soybean during two growth stages, namely third trifoliate stage (V3) and beginning of flowering of the plants (R1) in the pot condition. The experiment was established with a two-factorial randomized plot design with four replications. The fertilizer applications had a significant effect (p<0.01) on the V3 and R1 growth stages of soybean. The highest plant height (36.78 cm) and root length (41.18 cm) were achieved with vermicompost, and the lowest plant height (21.73 cm) was recorded with inorganic fertilizer. The number of nodules was highest for vermicompost and cattle manure applications (17.16 plant-1 and 16.76 plant-1, respectively), and lowest for poultry manure (0.22 plant-1). In the R1 growth stage, poultry manure produced the highest biological fresh and dry weights, root dry weight at 25.08 g plant-1 and 5.67 g plant-1, 3.99 g plant-1 respectively. As a result, it was demonstrated that vermicompost and poultry manure applications promote strong root and plant development due to high organic matter and phosphorus and can be used successfully without inorganic fertilize application in soybean farming.
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Eaton, Leonard J. "Long-term effects of herbicide and fertilizers on lowbush blueberry growth and production". Canadian Journal of Plant Science 74, nr 2 (1.04.1994): 341–45. http://dx.doi.org/10.4141/cjps94-066.
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Effects of herbicide and herbicide-fertilizer combinations on vegetative and reproductive growth of the lowbush blueberry (Vaccinium angustifolium Ait.) were assessed over a 12-yr period (six production cycles). All treatments stimulated stem lengths, fruit buds per stem and fresh fruit yields compared with untreated controls, but only after 3–6 yr. After the second cycle, stem lengths and fruit bud numbers were greater in herbicide + NPK-treated plants than in all others. Fresh fruit yields were variable throughout the study but were higher in herbicide and herbicide + fertilizer plots than in untreated controls after 1982, except in 1988. Nitrogen levels were greater in leaves and rhizomes of plants in all herbicide and herbicide + fertilizer plots than in control plots after 10 yr, whereas phosphorus was higher only in plants fertilized with NPK. These results suggest the lowbush blueberry responds slowly to herbicide and fertilizer applications. Increased vegetative and reproductive development, as well as denser plant stands, resulted from repeated herbicide and fertilizer applications. Fertilizers applied in conjunction with herbicides stimulate vegetative growth (and fruit buds if an NPK fertilizer), but appear to have no consistent effect on fresh fruit yields. Key words:Vaccinium angustifolium, fertilizer, herbicide, fruit buds, yield
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Lubell, Jessica D., Kris J. Barker i George C. Elliott. "Comparison of Organic and Synthetic Fertilizers for Sedum Green Roof Maintenance". Journal of Environmental Horticulture 31, nr 4 (1.12.2013): 227–33. http://dx.doi.org/10.24266/0738-2898.31.4.227.
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Fertility is an important aspect of green roof maintenance. Aesthetic quality and growth of two sedum species (Sedum album and Sedum rupestre ‘Angelina’) treated with synthetic granular fertilizer [Green View 10N-4.4P-8.3K (10-10-10)] and two organic fertilizers [Coast of Maine 4N-0.9P-1.7K (4-2-2) and Nature Safe 8N-2.2P-4.5K (8-5-5)] at 10 g N·m−2 applied as a single spring application or a split application (spring and summer) and a controlled-release fertilizer [Nutricote 14N-6.1P-11.6K (14-14-14)] at the same rate and a no fertilizer control were evaluated. The best aesthetic quality and growth was for the single application synthetic granular fertilizer, followed by the split application of synthetic granular fertilizer. Also, single applications were better than split application for the organic fertilizers, indicating that sedums use nutrients the most in spring. The organic fertilizers performed poorly because they failed to provide utilizable nutrients in adequate quantities. A low level of microbial activity in green roof media, may have contributed to the minimal amount of utilizable nutrients released by the organic fertilizers. Plants treated with controlled-release fertilizer performed similarly to the control, however, the following spring they had the best aesthetic quality, indicating the prills contained some residual nutrients.
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Prince, T. L., H. K. Tayama, T. A. Prince, N. R. Bhat i S. A. Carver. "CONTROLLED-RELEASE FERTILIZER REGIMES INFLUENCE PRODUCTION AND POSTPRODUCTION QUALITY OF POTTED CHRYSANTHEMUMS". HortScience 25, nr 9 (wrzesień 1990): 1092d—1092. http://dx.doi.org/10.21273/hortsci.25.9.1092d.
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Controlled-release fertilizers (CRF), Nutricote 14N–6.2P-11.6K or Osmocote 14N-6.2P-11.6K, at the recommended rate (1×) and at half that rate (0.5×) plus 200 mg/l N of Peter's 20N-4.4P-16.6K water soluble fertilizer at every irrigation were applied to potted chrysanthemums cv. `Bright Golden Anne' and `Torch'. Production and postproduction quality was evaluated. CRF applications (1×) resulted in reductions of plant height (-10%), plant diameter (-17%), leaf area (-35%), and leaf dry weight (-47%), but did not affect number of flowers compared to plants receiving only water soluble fertilizer. Application of water soluble fertilizer with CRF (0.5×) increased foliar nutrient levels above water soluble fertilizer application alone, or above either CRF (1×). CRF applications (1×) resulted in improved floral longevity (up to +8 days) and flower color rating (up to +54%), and less foliar senescence (up to -45%) than the water soluble fertilizer application alone, or either of the CRFS (0.5×) used with water soluble fertilizer.
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YAMAN TÜRKKAN, Özgül, i Beyhan KİBAR. "Farklı Organik Gübrelerin Ispanakta Bitki Gelişimi, Verim, Kalite Özellikleri ve Element İçerikleri Üzerine Etkileri". Uluslararası Tarım ve Yaban Hayatı Bilimleri Dergisi 8, nr 2 (22.08.2022): 208–22. http://dx.doi.org/10.24180/ijaws.1094410.
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This study was conducted to determine the effects of different organic fertilizers on plant growth, yield, quality properties and element contents in spinach (Spinacia oleracea L.). The research was carried out under open field conditions in Bolu province. In the study, Matador spinach variety was used and seven different applications were examined. The applications were as follows: 1) Control, 2) Chicken manure, 3) Turkey manure, 4) Sheep manure, 5) Cattle manure, 6) Vermicompost and 7) Chemical fertilizer. The experiment was established in randomized complete block design with three replications. According to the research findings, significant differences were found among the applications. In general, organic fertilizer applications significantly increased yield, plant height, plant wet weight, plant dry weight, dry matter content, number of marketable leaves, nitrogen, phosphorus, sulphur and selenium contents of the plant in comparison with control and chemical fertilizer. The highest yield was determined in cattle manure application. It was observed that cattle manure increased the yield by 88.08% compared to the control and increased the yield by 41.16% compared to the chemical fertilizer. In organic fertilizer applications, heavy metal contents such as arsenic, chrome, cobalt, and nickel were found to be lower than the control and, aluminum and cadmium contents were found to be lower than chemical fertilizer. As a result, it was determined that organic fertilizers examined in the study have positive effects on plant growth, yield, quality properties and element contents of spinach and organic fertilizers can be used successfully for sustainable agriculture in spinach cultivation.
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Jayalakshmi, M., G. Prasadbabu, B. H. Chaithanya, A. Lavanya i T. Srinivas. "Usages of Mobile Application Developed by Krishi Vigyan Kendra Banavasi". Indian Journal of Extension Education 58, nr 1 (2022): 72–75. http://dx.doi.org/10.48165/ijee.2022.58116.
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A survey was conducted to assess the impact of mobile applications developed by theKrishiVigyan Kendra Banavasi with 150 farmers in Kurnool district of Andhra Pradesh inthe year 2020. KVK Banavasi developed three mobile applications namely ANGRAU-ATARI CFLD, ANGRAU Pashu Poshan and Fertilizer Calculator for benefiting farmingcommunity. Majority (64.67%) of the respondents were found in medium usage of mobileapplications, in agriculture. Fertilizer Calculator mobile application was found highest usage(74.50%) among the farmers when compared with other two applications. ANGRAUATATRI CFLD application was used by an average of 46.83 per cent farmers forinformation on new improved varieties, 75 % for control measures of pest and diseasesand 29 per cent for market related information. ANGRAU Pashu Poshan application wasused by 75 per cent livestock farmers for sheep management, 56 per cent for cattlemanagement and 45 per cent for poultry related information. Fertilizer calculator applicationwas used by 80 per cent farmers for recommended dose of fertilizers and 10 per cent forsoil test based fertilizer application.
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Ewetola, I. A., A. A. Amisu, S. O. Jimoh, T. O. Muraina, J. A. Olanite i O. M. Arigbede. "Impact of fertilizer types on the nutritive quality of two tropical grass species harvested at different stages of growth during wet season". Nigerian Journal of Animal Production 47, nr 3 (17.12.2020): 309–22. http://dx.doi.org/10.51791/njap.v47i3.169.
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The use of inorganic fertilizers has been reported to have improved pasture productivity, however it has also attributed to soil toxicity, environmental pollution, mineral imbalance, and health hazards among many adverse effects. This made the adoption of organic fertilizers became best alternative to correct nutrients deficiencies in the soil due to their environmental friendly nature and less cost effectiveness. To investigate the comparative advantages of these two types of fertilizer, an experiment was conducted to evaluate the influence of fertilizer types on the nutritive quality of Panicum maximum var. Ntchisi and Andropogon tectorum harvested at 6 and 8 weeks during the wet season. The study was a factorial experiment (4 x 2 x 2), arranged in a split-split-plot design with three replicates. There were 16 treatments to include; fertilizer types (NPK, Aleshinloye organo-mineral fertilizer, poultry manure and control (no fertilizer)), grass species (Panicum maximum var. Ntchisi and Andropogon tectorum) and age at harvest (6 and 8 weeks). Fertilizer treatments were allotted to the main plots while grass species were allotted to sub-plots and again harvest age was allotted to sub-subplots. Sub-samples taken from harvested forage materials were oven dried, properly milled and analysed in the laboratory to determine proximate composition [crude protein (CP%), ash, ether extract (EE%)], fibre fractions [acid detergent fibre (ADF%), neutral detergent fibre (NDF%), acid detergent lignin (ADL%), Cellulose, and Hemicelluloses) and in vitro gas production. Fertilizer types significantly (P<0.0.5) affected ADF, hemicellulose, cellulose and methane (CH4). The grasses fertilized with NPK had the highest value (9.00mL) for CH4. Poultry manure (PM) fertilized grasses recorded the highest value for in vitro dry matter digestibility (IVDMD) (89.38%). Andropogon tectorum fertilized with PM harvested at 6 weeks recorded the highest value for IVDMD (93.00%) and the same grass fertilized with NPK, harvested at 6 weeks recorded the highest values (0.37 mL and 4.70%) for short chain fatty acid and metabolizable energy, respectively. Therefore, this study established that fertilizer applications had an influence on fibre fraction, methane and post-incubation parameters of the grasses investigated.
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Watson, Gary. "The Effect of Broadcast Nitrogen Fertilization Rates and Placement on the Growth of Green Ash Trees". Arboriculture & Urban Forestry 36, nr 4 (1.07.2010): 179–82. http://dx.doi.org/10.48044/jauf.2010.024.
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Tree responses to slow-release nitrogen fertilization treatments were limited, but application of fertilizer to the inner half of the root zone improved caliper growth and relative chlorophyll content. Concentrating nitrogen fertilizer applications closer to the base of the tree may be able to take advantage of naturally higher root density, in addition to any further root stimulation resulting from the applied fertilizer treatment. The study site was moderately fertile, as are many urban landscapes where lawn and planting beds surrounding trees are fertilized. The pre-existing level of fertility may have contributed to the limited growth response to the nitrogen applications.
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Zinkevičienė, Raimonda, Eglė Jotautienė, Antanas Juostas, Antonio Comparetti i Edvardas Vaiciukevičius. "Simulation of Granular Organic Fertilizer Application by Centrifugal Spreader". Agronomy 11, nr 2 (29.01.2021): 247. http://dx.doi.org/10.3390/agronomy11020247.
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There is no specialized equipment designed to spread granular cylindrical organic fertilizer in the soil. There are also no rational recommendations available on how to spread this type of fertilizer. Mineral fertilizer spreaders are most often used for spreading granulated organic fertilizer. However, these fertilizers are significantly different from mineral fertilizers. Due to these differences, organic granular fertilizers often are spread unevenly, and the fertilizer does not reach the required working width. Furthermore, the rate of spreading is not accurate, and the fertilizer is often crushed too much. The objective of this research is to develop a simulation model for granular organic fertilizer applications with a centrifugal spreader in EDEM (extended distinct element method) software. It is possible to develop a numerical model that corresponds to a real spreader, and to determine the key physical–mechanical parameters for the application of granular organic fertilizer. This model can also be used for evaluating the transverse uniformity of the fertilizer in the field (along the trajectory normal to the machine). The results of this research show that the distance traveled by the fertilizer granules partially depends on the particle size, initial speed, type of fertilizer and the parameters of the spinning discs of the spreader.
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Kızıloğlu, Rüveyda, i Nuray Kızılaslan. "Kahramanmaraş İli Merkez İlçe Kırsalında Çiftçilerin Gübre Kullanım Durumu". Turkish Journal of Agriculture - Food Science and Technology 5, nr 1 (15.01.2017): 18. http://dx.doi.org/10.24925/turjaf.v5i1.18-23.769.
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In this research, fertilizer and soil analysis applications over farmers in District of Kahramanmaras Province has been determined. Investigation data cover surveys made to 379 cultivators. The result indicated that there was no effective and rational fertilizing in area. It was found that farmer’s applied fertilizers without considering soil analysis test. There were significant lack of extension and training about fertilizer use and fertilizing. Farmers need information about fertilizer and fertilizing application. Therefore, farmers training about fertilizer use should be given importance and extension programs should be improved in the research area.
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Guertal, E. A. "Slow-release Nitrogen Fertilizers in Vegetable Production: A Review". HortTechnology 19, nr 1 (styczeń 2009): 16–19. http://dx.doi.org/10.21273/hortsci.19.1.16.
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Slow-release nitrogen (N) fertilizers offer many potential benefits for vegetable production. In sandy soils, their use may lessen N leaching. If the slow-release fertilizer has a release pattern that matches crop needs, N uptake by the growing crop may become more efficient. Additionally, if slow-release fertilizers can be applied as a preplant application, production costs could be lessened, eliminating the need for multiple applications of soluble N fertilizer. Synthetic slow-release fertilizers can be separated into two general groups: those that are slow release as a byproduct of a chemical reaction (such as urea-formaldehyde), and those that are slow release via a sulfur, wax, or resin coating around the fertilizer prill. In vegetable crop research, much of the available literature has focused on use of sulfur coat urea and urea-formaldehyde, as they have been in the fertilizer market for 40 years. Newer research has evaluated resin-coated products. In most studies, use of slow-release N fertilizers as a preplant treatment did not decrease crop yield, but yield was rarely increased when compared with standard split applications of soluble N. Based on available research, the benefits of using slow-release N fertilizers in vegetable crop production will come from reduced environmental risk and savings in production costs.
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Guertal, E. A. "Slow-release Nitrogen Fertilizers in Vegetable Production: A Review". HortTechnology 19, nr 1 (styczeń 2009): 16–19. http://dx.doi.org/10.21273/horttech.19.1.16.
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Slow-release nitrogen (N) fertilizers offer many potential benefits for vegetable production. In sandy soils, their use may lessen N leaching. If the slow-release fertilizer has a release pattern that matches crop needs, N uptake by the growing crop may become more efficient. Additionally, if slow-release fertilizers can be applied as a preplant application, production costs could be lessened, eliminating the need for multiple applications of soluble N fertilizer. Synthetic slow-release fertilizers can be separated into two general groups: those that are slow release as a byproduct of a chemical reaction (such as urea-formaldehyde), and those that are slow release via a sulfur, wax, or resin coating around the fertilizer prill. In vegetable crop research, much of the available literature has focused on use of sulfur coat urea and urea-formaldehyde, as they have been in the fertilizer market for 40 years. Newer research has evaluated resin-coated products. In most studies, use of slow-release N fertilizers as a preplant treatment did not decrease crop yield, but yield was rarely increased when compared with standard split applications of soluble N. Based on available research, the benefits of using slow-release N fertilizers in vegetable crop production will come from reduced environmental risk and savings in production costs.
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Ahadiyat, Yugi Rahayu, i Sisno Sisno. "Hasil Padi dan Kelimpahan Gulma dengan Aplikasi Jenis Pupuk Berbeda di Lahan Kering Tadah Hujan pada Musim Kemarau". Jurnal Ilmu Pertanian Indonesia 26, nr 2 (28.04.2021): 259–66. http://dx.doi.org/10.18343/jipi.26.2.259.
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Rice yield and proper weed control need to be increased through an environmentally friendly agricultural system approach in rainfed land during the dry season by reducing the dosage of synthetic fertilizers. This study aims to determine the effect of different fertilizer applications on rice yield and weed abundance in rainfed land during the dry season. The study used a split-plot design, with the main plot of rice variety, i.e., Situ Bagendit and IR-64, and subplots of fertilizer, namely synthetic fertilizers (N, P, K), organic fertilizers + P60 + ½ dose of synthetic fertilizers, organic fertilizers + PGPR + ½ dose of synthetic fertilizer and organic fertilizer + P60 + PGPR + ½ dose of synthetic fertilizer with three replications. The variables observed were rice yield components, namely panicle length, total empty grain and content per panicle, grain weights per hill, effective plot and hectare, 1000 grain weight, harvest index, and weeds summed dominance ratio (SDR). The synthetic fertilizers and three various organic fertilizers, biological fertilizers, and synthetic fertilizers gave different results on the SDR of weeds. The weeds of Sphenoclea zeynalica and Cyperus difformis showed consistent dominance with higher SDR than other weeds, i.e.,> 15 and > 10, respectively. The application of organic and biological fertilizers with half the recommended dosage of the synthetic fertilizers is equivalent to applying the recommended dosage of synthetic fertilizers on rice yield during the dry season on the rainfed dryland with low rainfall intensity and a low yield of 1.3–1.7 t/ha.
Keywords: biological fertilizer, inorganic fertilizer, organic fertilizers, rice, weeds
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Williamson, Jeffrey G., i E. Paul Miller. "(374) Fertilization of Southern Highbush Blueberries on Pine Bark Beds". HortScience 40, nr 4 (lipiec 2005): 1059B—1059. http://dx.doi.org/10.21273/hortsci.40.4.1059b.
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Bearing `Misty' and `Star' southern highbush blueberries were grown on pine bark beds and fertilized at three rates using granular and liquid fertilizers with a 3–1–2 (1N–0.83K–0.88P) ratio. Granular fertilizer was applied 8 times per year at 4-week intervals beginning in April and continuing through October. Liquid fertilizer was applied with low volume irrigation 16 times per year at 2-week intervals during the same period. During the growing season, irrigation was applied at 2- to 3-day intervals in the absence of rain. A 2 cultivar × 2 fertilizer type × 3 fertilizer rate factorial arrangement of treatments was replicated 8 times in a randomized complete-block design. All fruits were harvested from single-plant plots at 3- to 4-day intervals. Canopy volume was not affected by fertilizer type, but fruit yield was slightly greater for granular than for liquid fertilizer treatments. In 2003, fruit yield of 2.5-year-old `Misty' and `Star' plants increased with increasing fertilizer rates up to the highest rate tested (50 g N/plant/year). Similarly, in 2004, fruit yields increased with increasing fertilizer rates up to the highest rate (81 g N/plant/year). Root distribution was limited to the 12-cm-deep layer of pine bark with very few roots penetrating into the underlying soil. The positive growth responses of blueberry plants to high fertilizer rates in pine bark beds suggests that soluble fertilizer was leached through the pine bark layer into the soil below the root zone. More frequent, lighter applications of soluble fertilizers, use of slow-release or controlled-release fertilizers, and careful irrigation management may improve fertilizer use efficiency of blueberry plantings on pine bark beds.
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Dhayalan, S. Aanoor, V. Davamani, M. Maheswari, S. Maragatham i C. Sharmila Rahale. "Influence of Nano Urea on Growth and Microbial Population in Paddy Ecosystem". International Journal of Environment and Climate Change 13, nr 10 (26.08.2023): 1239–47. http://dx.doi.org/10.9734/ijecc/2023/v13i102776.
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Chemical fertilizer usage has been a long-drawn criticism because of its harmful effects on the environment and on the quality of agricultural produce. Researchers are continually looking for more productive, better solutions while retaining societal wellbeing. Effective use of nano fertilizers in place of chemical fertilizers is essential in reducing fertilizer overuse and also contribute in lowering the pollution and leaching which in turn increase the effectiveness of nutrient consumption and also increase the yield of the crop. An experiment was carried out in paddy to study the influence of Nano urea applications on growth and microbial populations in soil. The field trial used a Randomized Block Design (RBD) with eight treatment combinations and three replications. Results showed that application of STCR based N as Urea (50%) and Nano Urea (2 sprays) and Recommended dosage of N as Urea (50%) and Nano Urea (2 sprays) recorded higher plant height, Leaf Area Index (LAI), Dry matter accumulation in paddy. In addition, applications of Nano urea increased the microbial population including bacteria, fungi and actinomycetes. Combining recommended dosage of fertilisers with nano urea spray at critical stages of paddy crop increases the crop growth and microbial activity.
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McTaggart, I. P., i K. A. Smith. "The effect of rate, form and timing of fertilizer N on nitrogen uptake and grain N content in spring malting barley". Journal of Agricultural Science 125, nr 3 (grudzień 1995): 341–53. http://dx.doi.org/10.1017/s0021859600084847.
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SUMMARYField experiments were carried out on six sites in eastern Scotland between 1987 and 1989 to determine the effect of nitrogen on the yield, N uptake and grain N concentration of spring barley grown for malting. The effects of fertilizer applications at rates from 0 to 150 kg N ha-1 and the timing of application were studied, using three fertilizer forms: calcium nitrate, ammonium sulphate and ammonium nitrate. Calcium nitrate applications significantly increased grain N concentrations (P < 0·05), and grain yields (P < 0·01 and 0·05) at two sites, above the values obtained with the other fertilizers, but there was no effect at the other sites. Split applications of calcium nitrate increased yields above those from single applications in some treatments at two sites. At low rates, recovery of 15N-labelled fertilizer was greatest when applied as calcium nitrate. Recovery fell at higher rates in calcium nitrate treatments, but rose in ammonium sulphate treatments. Uptake of fertilizer N, during the period of stem elongation in June, was significantly greater (P < 0·05) in the calcium nitrate and ammonium nitrate treatments. Maximum uptake was usually reached by the time of anthesis. Uptake of soil N was not as great during the early sampling periods, but continued up to harvest in most treatments. There was evidence of losses, between anthesis and harvest, of fertilizer N previously taken up by the crop. The uptake of soil N remained constant over the range of fertilizer treatments except with ammonium sulphate, where there was evidence of increased uptake at higher fertilizer rates, possibly due to ‘pool substitution’ of 15N-labelled fertilizer. The variation in soil N uptake between sites was greater than the variation in fertilizer N uptake caused by different forms of fertilizer and different application times.
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Kara, Kamil, Taşkın Erol i Aykut Şener. "The Effects of Foliar Vermicompost Applications on Yield and Some Yield Components in Triticale Varieties". Turkish Journal of Agriculture - Food Science and Technology 9, nr 12 (24.12.2021): 2136–46. http://dx.doi.org/10.24925/turjaf.v9i12.2136-2146.4345.
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Vermicompost fertilizers have started to attract attention in agriculture last years. Various liquid vermicompost fertilizers are produced and used in agriculture and some of them known as vermiliquer, vermi leachate, vermi tea or vermicast with little differences. This study is aimed to determine the effects of foliar application of liquid vermicompost fertilizer on yield and some yield components on some Turkey triticale varieties under Central Anatolian conditions in Kırıkkale province during the growing period 2014-15 and 2015-16. Six different (control, 75, 150, 250, 350 and 450 cc da-1) liquid vermicompost fertilizer doses were applied by the foliar spraying method at the beginning and end of March in both years to the five Turkey triticale varieties (Alperbey, Mikham 2002, Tatlıcak 97, Karma 2000 and Ümranhanım). According to the results, plant height, grain number and grain yield in spike, grain yield per decare, harvest index and protein content results were found to be significant in fertilizer × variety × year interaction. There is also a statistically significant difference between thousand-grain weight and the variety x fertilizer doses interaction, and between varieties and fertilizer doses in terms of spike length. The positive effects of liquid vermicompost fertilizer doses, except 450 cc da-1, were determined in varieties. It was observed that a satisfactory yield can be obtained from 250 cc da-1 in the absence of nitrogen fertilizers as the top fertilizer. It could be deduced that 250-350 cc da-1 doses of vermicompost fertilizer can be applied in triticale based on varying ecological conditions and varieties in Central Anatolian ecological conditions.
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Qin, Shasha, Feilong Rong, Manyun Zhang, Guirui Su, Wei Wang, Liqun Wu, Aiping Wu i Falin Chen. "Biochar Can Partially Substitute Fertilizer for Rice Production in Acid Paddy Field in Southern China". Agronomy 13, nr 5 (6.05.2023): 1304. http://dx.doi.org/10.3390/agronomy13051304.
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Biochar application has been confirmed as an efficient way to increase the productivity of the agricultural system. However, the potential of biochar combined with reducing fertilization on the yield, and the fertilizer utilization efficiency of the rice (Oryza sativa) farming system on acidic soil remains to be further studied. Field micro-plot experiments with two factors were performed in 2018 and 2019 to evaluate the responses of the rice yield and nutrient utilization to the combined application of biochar (60, 80, and 100 t/ha) and fertilizer reduction (70%, 85%, and standard doses of N-P-K fertilizer). Taoyouxiangzhan and Taiyou 553 were used in the late growing season of 2018 and 2019, respectively. The results showed that compared with the control without adding biochar under standard fertilization, 70% doses of fertilizer application had no negative effects on the yield and the N, P, and K accumulation of rice after biochar application. K accumulation of rice increased with the increase of biochar application. The partial productivity of N, P, and K fertilizers increased as the fertilizer was decreased. The agronomic efficiency of N, P, and K fertilizers significantly increased after the combined applications of biochar and fertilizer. In both years, micro-plots with 70% doses of fertilizer had the highest N and P physiological efficiency, as well as K physiological efficiency in 2019. Compared with the control under standard fertilization, utilization efficiency of N, P, and K fertilizer under different biochar and fertilizer combinations significantly increased by 34.24~75.48%, 27.44~84.84%, and 78.52~166.70%, respectively. To sum up, biochar can partially substitute fertilizer for rice production in acid paddy fields in southern China. When the amount of biochar added is ≥60 t/ha, 70% doses of fertilizer application can still ensure the nutrient absorption of rice, improve the fertilizer utilization efficiency, and ensure the stable yield of rice.
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Sasmita, Kurnia Dewi, Iswandi Anas, Syaiful Anwar, Sudirman Yahya i Gunawan Djajakirana. "Respons Benih Kakao Terhadap Amelioran, Mikrob Pelarut Fosfat, dan Pupuk Fosfat pada Tanah Masam". Jurnal Tanaman Industri dan Penyegar 7, nr 1 (30.03.2020): 39. http://dx.doi.org/10.21082/jtidp.v7n1.2020.p39-52.
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<em>The growth of cacao in acid soils is commonly limited by some problems such as low available P and pH, and high Al saturation. Therefore, research is needed to solve the problem of coffee cultivation in acid soil. This study aimed to determine the effect of ameliorant, phosphate solubilizing microbes (PSM), and phosphate fertilizers (P) on the growth and nutrient uptake of cacao seedlings, and some acid soil properties. The study used a randomized block design with 3 factors and 3 replications. The first factor was ameliorant applications (without ameliorant, 10% organic fertilizer, 4% rice husk biochar, 4% rice husk biochar + 10% organic fertilizer). The second factor was PSM applications: without PSM, Burkholderia ambifaria (BPF) inoculants, and Aspergillus niger (FPF) inoculants. The third factor was P fertilizers applications (without Phosphate Rock (PR), 100, 200, and 400 mg P/kg of PR, and 400 mg P/kg of SP-36). The results showed that the applications of 4% rice husk biochar + 10% organic fertilizer + BPF or FPF inoculants increase the number of leaves by 77.9% and 69.2%, respectively, and increase the dry weight of shoot by 93.6 % and 101.9%, respectively. Phosphate rock application in media without organic fertilizer increases dry weight of shoots and roots of cacao seedlings, and the uptake of P, Ca, and Mg in shoots linearly in line with the increase of PR dose to 400 mg P/kg. Application of rice husk biochar significantly increased the acid phosphatase activity of growing media. Meanwhile, organic fertilizer increased the soil pH, acid phosphatase and available P activity, and decreased Al-dd growing media.</em>
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Yeager, Thomas H. "TIMED FERTILIZER APPLICATIONS EFFECT DWARF YAUPON HOLLY GROWTH AND FERTILIZER UTILIZATION". HortScience 25, nr 9 (wrzesień 1990): 1097b—1097. http://dx.doi.org/10.21273/hortsci.25.9.1097b.
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Multiple branched liners of llex vomitoria were greenhouse-grown in 3-liter containers with a common nursery medium and received either 2.5 g N surface-applied in 1 application as Osmocote (18N-2.6P-10K) or a total of 0, 0.5, 1,5 or 2.5 g N per container from a solution that contained N, P and K in a ratio of 6:1:3. The solution fertilizer was applied either 1, 2, 3 or 4 times per week with total N applied per container equally divided among individual applications, After 26 weeks, shoot dry weights were greatest for plants that received 2.5 g of N as either 2 soluble applications per week or as Osmocote applied once at the beginning of the experiment. Plants that received 1.5 g of N applied 4 times per week had similar shoot dry weights. Nitrogen uptake will be calculated to determine if 4 applications par week resulted in greater utilization than 2 applications par week or 1 application of Osmocote during the growing season.
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Coolong, Timothy, Kate Cassity-Duffey i Andre Luiz Biscaia Ribeiro da Silva. "Influence of Nitrogen Rate, Fertilizer Type, and Application Method on Cabbage Yield and Nutrient Concentrations". HortTechnology 32, nr 2 (kwiecień 2022): 134–39. http://dx.doi.org/10.21273/horttech04982-21.
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Georgia is a leading fresh market cabbage (Brassica oleracea var. capitata) producer. Current recommendations for bare-ground cabbage grown in the Coastal Plain of Georgia indicate 175 to 225 lb/acre nitrogen (N). Approximately one-third of N fertilizer is recommended at planting, with two or three additional side-dress applications during the season. Growers have begun banding liquid fertilizer between four and six times during the season to reduce N leaching and enhance productivity. To determine the validity of current recommendations as well as the efficacy of applying periodic liquid fertilizer throughout the growing season, field experiments were conducted in Tifton, GA in Fall 2016 and 2017 with the cabbage cultivar Cheers. Fertilizer N rates were 175, 200, 225, and 250 lb/acre N applied using equivalent preplant fertilizer (50 lb/acre N) with two posttransplant applications of a granular fertilizer (27–0P–0K–5Ca) or six applications of a liquid fertilizer (9N–0P–0K–11Ca). A factorial, randomized, complete block design was used. There were no interactions among fertilizer program, N rate, or year for cabbage yield or nutrient concentrations. Total yield was unaffected by the N rate. However, plants fertilized with the lowest N rate (175 lb/acre N) had the lowest yields from the first two harvests compared with the other N rates. Nutrient concentrations were affected by year, with 2017 having greater concentrations of most macronutrients compared with 2016. In conclusion, the application of 175 lb/acre N led to a potential delay in harvest, but all other N rates were equal. The application method did not impact yield or earliness, suggesting that current recommendations for fertilizer applications after planting cabbage in Georgia are adequate.
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Wickham, Allison, i Jessica G. Davis. "Optimizing Organic Carrot (Daucus carota var. sativus) Yield and Quality Using Fish Emulsions, Cyanobacterial Fertilizer, and Seaweed Extracts". Agronomy 13, nr 5 (10.05.2023): 1329. http://dx.doi.org/10.3390/agronomy13051329.
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Liquid fertilizers are often used in the middle of the growing season in an attempt to enhance organic carrot (Daucus carota var. sativus) yield and quality, although their effect on plant performance is unproven. The impact of liquid organic fertilizers and foliar seaweed applications on carrot yield and quality characteristics were evaluated on certified organic land at the Colorado State University Horticulture Field Research Center in Fort Collins, CO, USA, in 2014 and 2015. Hydrolyzed and non-hydrolyzed fish fertilizer and cyanobacterial fertilizer (cyano-fertilizer) treatments were applied through a drip irrigation system at prescribed N rates about every 10 days throughout the growing season. Each treatment, including the unfertilized control, was repeated with the addition of concentrated organic seaweed extract, containing phytohormones, applied foliarly at the manufacturer’s recommended rates. The cyano-fertilizer treatment resulted in longer carrots in 2014 and the highest carrot yield in both years, with it consistently yielding equal to or greater than either hydrolyzed or non-hydrolyzed fish fertilizer. The foliar seaweed applications had no effect on carrot yield in either year. The cyano-fertilizer performed comparably to the other fertilizers, suggesting that cyano-fertilizer could be a viable alternative to organic liquid fish fertilizers.
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Rahman, Niharika, i Patrick J. Forrestal. "Ammonium Fertilizer Reduces Nitrous Oxide Emission Compared to Nitrate Fertilizer While Yielding Equally in a Temperate Grassland". Agriculture 11, nr 11 (14.11.2021): 1141. http://dx.doi.org/10.3390/agriculture11111141.
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Emissions of nitrous oxide (N2O), a potent greenhouse gas, are a challenge associated with application of nitrogen (N) fertilizers to soil. However, N source selection can play a role in reducing these emissions. Nitrous oxide emissions were measured from ammonium (ammonium sulfate) and nitrate (calcium nitrate) fertilizers over one year in temperate grassland using the closed static chamber method. Nitrogen was applied at a system representative rate of 220 kg ha−1 y−1 in six split applications. Cumulative annual N2O-N emissions were 0.29 kg ha−1 for the control, 1.07 kg ha−1 for the ammonium fertilizer and significantly higher at 2.54 kg ha−1 for the nitrate fertilizer. The annual emission factor (EF) for the ammonium fertilizer was 0.35% vs 1.02% for the nitrate fertilizer, a 66% reduction in the EF for ammonium vs nitrate and a 2.9 times higher EF for nitrate compared with ammonium. No difference in grass yield or N uptake was detected between fertilizers. This study shows that an ammonium fertilizer produces the same yield and N efficiency as a nitrate fertilizer with lower N2O emissions. The results also demonstrate that the nitrate portion of fertilizers is a key factor in N2O emissions in temperate grassland. This work is the first of its kind detailing the annual EF of both a solely ammonium-N and a solely nitrate-N fertilizer we could find.
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Vargas, Oscar L., i David R. Bryla. "Growth and Fruit Production of Highbush Blueberry Fertilized with Ammonium Sulfate and Urea Applied by Fertigation or as Granular Fertilizer". HortScience 50, nr 3 (marzec 2015): 479–85. http://dx.doi.org/10.21273/hortsci.50.3.479.
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Fertigation with liquid sources of nitrogen (N) fertilizers, including ammonium sulfate and urea, were compared with granular applications of the fertilizers in northern highbush blueberry (Vaccinium corymbosum L. ‘Bluecrop’) during the first 5 years of fruit production (2008–12). The planting was established in Apr. 2006 at a field site located in western Oregon. The plants were grown on raised beds and mulched every 2 years with sawdust. Liquid fertilizers were injected through a drip system in equal weekly applications from mid-April to early August. Granular fertilizers were applied on each side of the plants, in three split applications from mid-April to mid-June, and washed into the soil using microsprinklers. Each fertilizer was applied at three N rates, which were increased each year as the plants matured (63 to 93, 133 to 187, and 200 to 280 kg·ha−1 N) and compared with non-fertilized treatments (0 kg·ha−1 N). Canopy cover, which was measured in 2008 only, and fresh pruning weight were greater with fertigation than with granular fertilizer and often increased with N rate when the plants were fertigated but decreased at the highest rate when granular fertilizer was applied. Yield also increased with N fertilizer and was 12% to 40% greater with fertigation than with granular fertilizer each year as well as 17% greater with ammonium sulfate than with urea in 2011. The response of berry weight to the treatments was variable but decreased with higher N rates during the first 3 years of fruit production. Leaf N concentration was greater with fertigation in 4 of 5 years and averaged 1.68% with fertigation and 1.61% with granular fertilizer. Leaf N was also often greater with ammonium sulfate than with urea and increased as more N was applied. Soil pH declined with increasing N rates and was lower with granular fertilizer than with fertigation during the first 3 years of fruit production and lower with ammonium sulfate than with urea in every year but 2010. Soil electrical conductivity (EC) was less than 1 dS·m−1 in each treatment but was an average of two to three times greater with granular fertilizer than with fertigation and 1.4 to 1.8 times greater with ammonium sulfate than with urea. Overall, total yield averaged 32 to 63 t·ha−1 in each treatment over the first 5 years of fruit production and was greatest when plants were fertigated with ammonium sulfate or urea at rates of at least 63 to 93 kg·ha−1 N per year.
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Rini, Erin Puspita, i Sugiyanta Sugiyanta. "RESPON TANAMAN KUBIS (Brassica olacea var. capitata) TERHADAP KOMBINASI APLIKASI PUPUK ORGANIK DAN ANORGANIK". Jurnal Ilmu-Ilmu Pertanian Indonesia 23, nr 1 (15.06.2021): 46–52. http://dx.doi.org/10.31186/jipi.23.1.46-52.
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[CABBAGE (Brassica olacea var. capitata) GROWTH AND YIELD AFFECTED BY COMBINATION OF ORGANIC AND INORGANIC FERTILIZER APPLICATIONS]. The use of organic fertilizer increasingly sought by farmers due to the increase in demand for organic products by consumers and also awareness of the sustainability of the land. The use of organic fertilizers in the cultivation alone could improve the soil quality but needs to be balanced with inorganic fertilizers to meet the nutrient adequacy. This study aims to examine the effect of organic and inorganic fertilizers combination on the growth and cabbage yield, and also to determine the most efficient dosage combination of organic and inorganic fertilizers. This research was conducted at the IPB Pasir Sarongge Experimental Station, Cianjur, West Java from November 2020 to February 2021. The study was compiled using RCBD with 4 replications and 7 treatments. The results showed the combination of 0.75 doses of inorganic fertilizer (150 kg/ha of urea, 75 kg/ha SP36, and 75 kg/ha KCl) and 3 tons/ha of organic fertilizer could increase 14.87 to 15.44% plant height and the number of leaves at 12.82 -15.11% compared to the same dose of inorganic fertilizer treatment alone. The combination of 1 dose (200 kg/ha of urea, 100 kg/ha SP36, and 100 kg/ha KCl) inorganic fertilizer application and 2 tonnes/ha of organic fertilizer could increase 50,60% yield/plot and yield/ha cabbage than 1 dose of inorganic fertilizer treatment..
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JANZEN, H. H., C. W. LINDWALL i C. J. ROPPEL. "RELATIVE EFFICIENCY OF POINT-INJECTION AND SURFACE APPLICATIONS FOR N FERTILIZATION OF WINTER WHEAT". Canadian Journal of Soil Science 70, nr 2 (1.05.1990): 189–201. http://dx.doi.org/10.4141/cjss90-021.
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Conventional methods of N application for winter wheat often exhibit low fertilizer use efficiency. The comparative effectiveness of a new method, point-injection of N solution, was evaluated in two similar microplot field experiments established in southern Alberta. The first experiment, conducted over three site-year combinations in 1985 and 1986, compared yield response and fertilizer uptake in four spring-applied fertilizer treatments: broadcast urea-ammonium nitrate (UAN), broadcast urea, broadcast ammonium nitrate, and point-injected UAN, all applied in solution form. The second experiment, conducted at five sites in 1987, compared four spring-applied fertilizer treatments: surface-banded UAN, broadcast urea (granular), broadcast ammonium nitrate (granular), and point-injected UAN. All fertilizers were labeled with 15N to permit direct estimation of fertilizer uptake. The experiments demonstrated significant increases in fertilizer efficiency with point-injection under some conditions. In five of eight comparisons conducted over a 3-yr period, point-injection treatments exhibited significantly higher fertilizer use efficiency than conventional broadcast methods of application. Average fertilizer-N recovery by the crop at all eight sites was 37% in the point-injection treatments compared with only 26% in the broadcast ammonium nitrate treatment, the next most effective method of N application. When one site was excluded, because of possible confounding effects of application time, average recoveries were 34 and 26%, respectively. The increased efficiency of point-injected fertilizers was attributed to the direct placement of fertilizer N into the active rooting zone of the crop. The advantage of point-injection over conventional methods of application was highly variable, ranging from approximately 0 to over 100%, in part because of variations in precipitation patterns. The results of these microplot studies suggest that point-injection has potential for significant enhancement of fertilizer use efficiency in winter wheat, particularly in semi-arid production regions. Key words: 15N, nitrogen, urea, ammonium nitrate, fertilizer placement
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Tayade, Rupesh, Amit Ghimire, Waleed Khan, Liny Lay, John Quarshie Attipoe i Yoonha Kim. "Silicon as a Smart Fertilizer for Sustainability and Crop Improvement". Biomolecules 12, nr 8 (25.07.2022): 1027. http://dx.doi.org/10.3390/biom12081027.
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Silicon (Si), despite being abundant in nature, is still not considered a necessary element for plants. Si supplementation in plants has been extensively studied over the last two decades, and the role of Si in alleviating biotic and abiotic stress has been well documented. Owing to the noncorrosive nature and sustainability of elemental Si, Si fertilization in agricultural practices has gained more attention. In this review, we provide an overview of different smart fertilizer types, application of Si fertilizers in agriculture, availability of Si fertilizers, and experiments conducted in greenhouses, growth chambers, and open fields. We also discuss the prospects of promoting Si as a smart fertilizer among farmers and the research community for sustainable agriculture and yield improvement. Literature review and empirical studies have suggested that the application of Si-based fertilizers is expected to increase in the future. With the potential of nanotechnology, new nanoSi (NSi) fertilizer applications may further increase the use and efficiency of Si fertilizers. However, the general awareness and scientific investigation of NSi need to be thoughtfully considered. Thus, we believe this review can provide insight for further research into Si fertilizers as well as promote Si as a smart fertilizer for sustainability and crop improvement.
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Gautam, Shriniwas, Yam Kanta Gaihre, Ganga Dutta Acharya, Prabin Dongol i Dyutiman Choudhary. "Fertilizer demand-supply gap and avenues for policy revisits in Nepal". SAARC Journal of Agriculture 20, nr 2 (29.12.2022): 223–34. http://dx.doi.org/10.3329/sja.v20i2.63583.
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Nepal's farmers report fertilizer shortages yearly, especially for rice, wheat, and maize production. A reliable and established approach to estimating the actual demand for fertilizers for different crops and cropping seasons is lacking. Therefore, it is difficult to project the types and quantity of fertilizer to import and allocate across various regions in the country. With the direct involvement of the Government of Nepal (GoN) in fertilizer import, price (subsidy), and distribution, together with the high affinity of farmers for the subsidy, there is no incentive for the private sector to import and distribute fertilizers. Thus, farmers’ access to fertilizers in the country depends primarily on the subsidy budget, quantity and types of fertilizers imported, and their distribution management. In this study, the fertilizer demands, both at the national and sub-national levels, were estimated through a survey of cooperatives that distribute subsidized fertilizers in the country. Our estimate suggests that the fertilizer supplied in 2018/19 was only 60% of the total effective demand in the country. With this estimate of the demand-supply gap and the price variability across provinces, short, medium, and long-term policy recommendations are made to improve the supply of chemical fertilizer in the country SAARC J. Agric., 20(2): 223-234 (2022)
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Herdiyanti, Tri, Sugiyanta , i Hajrial Aswidinnoor. "Tanggap Tiga Varietas Padi Sawah terhadap Kombinasi Pemupukan dengan Sistem Pembenaman Jerami". Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) 43, nr 3 (23.02.2016): 179. http://dx.doi.org/10.24831/jai.v43i3.11242.
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<p>ABSTRACT</p><p>Degradation of soil fertility due to inaccurate application of fertilizer become one of the factors causing the stagnant rice productivity improvement in Indonesia. Straw incorporation, organic fertilizers and biofertilizers applications potentially reduces a rates of inorganic fertilizers and improves soil fertility. The aim of this study was to evaluate growth and yield of 3 lowland rice varieties (high yielding variety, new plant type, and local variety) in response to reduce NPK rates with straw incorporation, organic fertilizer, and biofertilizer in 7th planting season. The research was conducted at rice field in Karawang, West Java, from April-August 2013. The research was arranged in split plot randomized block design with 3 replications. The main plot was fertilizer application consisted of 10 treatments (combination of organic and inorganic fertilizers), while the sub plot was rice varieties (Ciherang, IPB 3S, and Mentik Wangi). The application of inorganic fertilizer, 400 kg NPK 30-6-8 ha-1, was control treatment. Plot size was 6.5 m x 10 m, with a double row spacing (25 cm x 15 cm x 50 cm). The result showed that growth of the three varieties was not significantly different so as the yield at 50% reduced NPK rate with incorporation of straw, organic fertilizer and biofertilizer. Adding of solid and liquid organic fertilizer, and biofertilizers on treatment of straw incorporation + 50% NPK rate was unnecessary due to insignificant yield increase.</p><p>Keywords: Ciherang, fertilizer, IPB 3S, local variety, Mentik Wangi, new plant type</p>
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Boring, Timothy, Kurt Thelen, James Board, Jason De Bruin, Chad Lee, Seth Naeve, William Ross, Wade Kent i Landon Ries. "Phosphorus and Potassium Fertilizer Application Strategies in Corn–Soybean Rotations". Agronomy 8, nr 9 (19.09.2018): 195. http://dx.doi.org/10.3390/agronomy8090195.
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To determine if current university fertilizer rate and timing recommendations pose a limitation to high-yield corn (Zea mays subsp. mays) and soybean (Glycine max) production, this study compared annual Phosphorous (P) and Potassium (K) fertilizer applications to biennial fertilizer applications, applied at 1× and 2× recommended rates in corn–soybean rotations located in Minnesota (MN), Iowa (IA), Michigan (MI), Arkansas (AR), and Louisiana (LA). At locations with either soil test P or K in the sub-optimal range, corn grain yield was significantly increased with fertilizer application at five of sixteen site years, while soybean seed yield was significantly increased with fertilizer application at one of sixteen site years. At locations with both soil test P and K at optimal or greater levels, corn grain yield was significantly increased at three of thirteen site years and soybean seed yield significantly increased at one of fourteen site years when fertilizer was applied. Site soil test values were generally inversely related to the likelihood of a yield response from fertilizer application, which is consistent with yield response frequencies outlined in state fertilizer recommendations. Soybean yields were similar regardless if fertilizer was applied in the year of crop production or before the preceding corn crop. Based on the results of this work across the US and various yield potentials, it was confirmed that the practice of applying P and K fertilizers at recommended rates biennially prior to first year corn production in a corn–soybean rotation does not appear to be a yield limiting factor in modern, high management production systems.
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Saputra, H., i N. Anggraini. "Growth Response of Edamame Soybeans on Various Combination Packages of Single and Compound Inorganic Fertilizers". IOP Conference Series: Earth and Environmental Science 1012, nr 1 (1.04.2022): 012057. http://dx.doi.org/10.1088/1755-1315/1012/1/012057.
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Abstract The many types of inorganic fertilizers cause us to have to choose the right type of inorganic fertilizer for the type and phase of plant growth. The purpose of this study was to determine the best combination of inorganic fertilizers that could increase the growth of edamame soybeans. The treatment was a combination of various types of inorganic fertilizer applications, namely: Control: organic basic fertilizer 2 t/ha + dolomite fertilizer 1 t ha-1 (P0), Urea 100 kg ha-1 + SP-36 150 kg ha-1 + KCL 100 kg ha-1 (P1), compound NPK 300 kg ha-1 (P2), compound NPK 150 kg ha-1 + Urea 50 kg ha-1 + SP-36 75 kg ha-1 + KCL 50 kg ha-1 (P3), Urea 100 kg ha-1 + SP-36 150 kg ha-1 + KCL 100 kg ha-1 + Gandasil B fertilizer (6 g 1-1 water) (P4), 300 kg ha-1 compound NPK + Gandasil B fertilizer (6 g 1-1 water) (P5), NPK compound 150 kg ha-1 + Urea 50 kg ha-1 + SP-36 75 kg ha-1 + KCL 50 kg ha-1 + Gandasil B fertilizer (6 g 1-1 water) (P6), and compound NPK 300 kg ha-1 + Gandasil fertilizer D (2 g 1-1 water) + Gandasil B fertilizer (6 g 1-1 water) (P7). The results showed that the application of various combinations of inorganic fertilizers affected the growth of edamame soybeans. This can be seen from the increase in number of branches, leaf area, weight wetness of plants, and the number of flowering plants. In general, the treatment P5 fertilizer package = NPK compound 300 kg ha-1 + Gandasil B fertilizer (6 g 1-1) was able to increase the best edamame soybean growth and simpler in application of fertilization.
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Safitri, Dian, Nurul Magfirah, Irmawanty Irmawaty i Haerul Syam. "Pembuatan Bokasi Berbahan Dasar Jerami Bagi Masyarakat Kelompok Tani Di Desa Borikamase Kabupaten Maros". Biosel: Biology Science and Education 10, nr 1 (1.06.2021): 71. http://dx.doi.org/10.33477/bs.v10i1.1895.
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The large number of rice fields in Borikamase Village, resulting in high production of hay, requires an appropriate effort to use straw into organic fertilizer or bokashi which is environmentally friendly as well as safe for plants. The use of straw into bokashi or organic fertilizer needs to be taught to the farming community, so the community service team focuses on providing assistance and training to the community in utilizing straw as a raw material in making bokashi by using microorganisms as the source of fermentation. In addition, the high price of synthetic fertilizers on the market makes farmers in Borikamase Village feel heavy in providing nutritional supplies to their agricultural areas, so that this training is expected to help farmers by obtaining fertilizers that are cheap, safe, and of good quality to fertilize. The existence of biotechnology applications, provides the right solution in overcoming the damage to bald mountains and the scarcity and high price of synthetic fertilizers, namely by processing straw into bokashi or organic fertilizers with high nutrient content and are safe for the environment. In addition, providing knowledge and skills for farming communities as agents of reform in restoring ecosystem balance through the application of bokashi made of straw on rice fields.
Keywords: Training, Mentoring, Boricamase, Straw
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Altamimi, May Elfar, Rhonda R. Janke, Kimberly A. Williams, Nathan O. Nelson i Leigh W. Murray. "Nitrate-Nitrogen Sufficiency Ranges in Leaf Petiole Sap of Brassica oleracea L., Pac Choi Grown with Organic and Conventional Fertilizers". HortScience 48, nr 3 (marzec 2013): 357–68. http://dx.doi.org/10.21273/hortsci.48.3.357.
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Greenhouse experiments were conducted to determine the response of Brassica oleracea L., pac choi to fertilizer rates and sources and to establish optimal soluble nitrogen (N) application rates and nitrate meter sufficiency ranges. Conventional soluble fertilizer was formulated from inorganic salts with a 4:1 NO3-N:NH4-N ratio. Phosphorus (P) was held at 1.72 mm and potassium (K) at 0.83 mm for all treatment levels. The organic soluble fertilizer, fish hydrolyzate (2N–1.72P–0.83K), was diluted to provide the same N levels as with conventional treatments. Both fertilizers were applied at N rates of 0, 32, 75, 150, 225, 300, and 450 mg·L−1. Seedlings were transplanted and fertilizer application began at 18 days. Plants were harvested at 7 weeks (5 weeks post-transplanting) after receiving 15 fertilizer applications during production. Samples of the most recently matured leaves were harvested weekly and analyzed for petiole sap NO3-N and leaf blade total N concentration. Leaf count, leaf length, and chlorophyll content were also measured weekly. Fresh and dry weights were determined on whole shoots and roots. Optimum yield was achieved at the 150-mg·L−1 fertility rate with both conventional and organic fertilizers. Field and high tunnel experiments were conducted to validate the sufficiency ranges obtained from the greenhouse studies. Sufficiency levels of NO3-N for pac choi petiole sap during Weeks 2 to 3 of production were 800 to 1500 mg·L−1 and then dropped to 600 to 1000 mg·L−1 during Weeks 4 through harvest for both conventional and organic fertilizers sources. Total N in leaf tissue was less responsive to fertilizer rate effects than petiole sap NO3-N. Chlorophyll content was not useful in evaluating pac choi N status. These guidelines will provide farmers with information for leaf petiole sap NO3-N to guide in-season N applications.
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Malhi, S. S., J. J. Schoenau i C. L. Vera. "Influence of six successive annual applications of sulphur fertilizers on wheat in a wheat–canola rotation on a sulphur deficient soil". Canadian Journal of Plant Science 89, nr 4 (1.07.2009): 629–44. http://dx.doi.org/10.4141/cjps08217.
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A 9-yr (1999–2007) field experiment was conducted on a S-deficient Gray Luvisol (Typic Cryoboralf) loam soil at Porcupine Plain in northeastern Saskatchewan. The objective was to compare the influence of six successive annual applications (1999–2004) and the following residual effects for 3 yr (2005–2007) of elemental S and sulphate-S fertilizers on yield, seed protein and total S concentration, and S uptake of wheat (Triticum aestivum L.) in a wheat–canola rotation. Treatments used were combinations of two application times (preceding autumn and before seeding in spring) with two granular elemental S fertilizers (ES-90 and ES-95), one fertilizer containing both elemental S and sulphate-S (Agrium Plus), ammonium sulphate, and a zero-S control. The S fertilizers were applied annually at a rate of 15 kg S ha–1. From 1999 to 2004, seed yield (3 yr) and straw yield (4 yr), seed protein concentration (3 yr), total S concentration in seed (4 yr), and S uptake in seed (5 yr) and straw (5 yr) of wheat showed significant response to S fertilization. In the first year (1999), ammonium sulphate and Agrium Plus were more effective than ES-90 and ES-95. In the following years (2000–2004), there was no significant effect of S source on seed and straw yield. Sulphate-S containing fertilizers produced greater total S concentration in seed and S uptake in straw (3 yr) and for S uptake in seed (1 yr). There was no effect of timing of S application on seed yield and protein concentration in any year, but autumn application was superior to spring application for straw yield and S uptake (1 yr), and for seed total S concentration and S uptake (2 yr). Residual effects of six previous S applications showed improvement in wheat seed yield until 2006, and straw yield and total S uptake until 2007. Elemental S, especially when applied in autumn, tended to have more lasting residual effects than the other S fertilizer treatments. There was some build-up of residual sulphate-S in soil in almost all S fertilizer treatments after four successive applications, but this was generally higher with sulphate-S-containing fertilizers. Recovery of applied S from 1999 to 2004 in plants was usually higher with sulphate-S fertilizer than with elemental S fertilizer in most years. Recovery of applied S in soil was higher for sulphate-S fertilizers, followed by ES-90, and finally ES-95. Residual nitrate-N in soil was significantly lower in spring-applied ammonium sulphate treatment than the zero-S or other S treatments. Key words: Elemental S, fertilizer, protein concentration, S uptake, sulphate-S, wheat, yield
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Ndzingane, Temave S., Michael T. Masarirambi, Kwanele A. Nxumalo, Emmanuel N. Kunene, Diana M. Earnshaw, Molyn Mpofu, Daniel V. Dlamini i Sifiso Sihlongonyana. "Effects of organic fertilisers on growth, yield and nutritional content of sweet basil (Ocimum basilicum L.)". Advancement in Medicinal Plant Research 10, nr 1 (2022): 1–16. http://dx.doi.org/10.30918/ampr.101.20.040.
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Sweet basil (Ocimum basilicum L.) is one of the major essential oil-producing species used in culinary and fragrance applications. However, there is a dearth of information pertaining to its organic production in the country. A field study laid out in a Randomized Complete Block Design (RCBD) was conducted at the Horticulture Farm, Luyengo Campus, University of Eswatini to assess the effects of organic fertilisers on the growth, yield and nutritional content of basil. This study consisted of four treatments replicated four times. The organic fertilisers used were chicken manure, kraal (cattle) manure and compost. The rates of application were 40 t/ha for the manures. Chemical fertilizer 2:3:2 (22) + 0.5 Zinc (Zn) and limestone ammonium nitrate (LAN 28%) were included at application rates of 150 kg/ha basal dressing and 100 kg/ha LAN top dressing, respectively. The results showed that the type of organic fertilizer applied affected the growth and yield of sweet basil. A trend in the superiority of the different types of organic fertilisers was observed as chicken manure exhibited higher values of the number of leaves (134.2), branches (78.6), leaf area (30.2 cm2)) and chlorophyll content (68.2 CCI), fresh leaf mass (355 g), and fresh mass of basil plant (691 g). Kraal manure was the second, followed by chemical fertilizer and lastly compost. There were no significant (P > 0.05) differences in P, K, Mn, Cu, and Zn content due to the application of different organic fertilisers. Calcium, Mg and Fe showed significant (p < 0.05) differences among the treatments. The use of chicken manure in the production of basil should be encouraged because its application resulted in relatively higher growth and yields compared to the other fertilisers. Keywords: Organic fertilizers, growth, basil, medicinal properties, mineral content.
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Alemayehu, Yitayal Addis, Assefa Adane Demoz, Mekonnen Amberber Degefu, Getachew Dagnew Gebreeyessus i Sintayehu Fetene Demessie. "Effect of human urine application on cabbage production and soil characteristics". Journal of Water, Sanitation and Hygiene for Development 10, nr 2 (30.05.2020): 262–75. http://dx.doi.org/10.2166/washdev.2020.136.
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Abstract The aim of this study was to examine the effect of human urine on soil quality and salinity through repeated applications, and compare it with the effects of synthetic fertilizer and non-fertilized treatments. Six different fertilizer mixtures were applied to pots of head cabbage: 100% tap water, 100% urine, 1:1 urine and tap water, 1:2 urine and tap water, 1:3 urine and tap water, and synthetic fertilizer. The study design was completely randomized design (CRD) with three replications of pot-based experiments. The growth and yield parameters of producing head cabbage (Brassica oleracea) among treatments were compared. Soil residual test of the optimum treatment was also conducted for the optimum treatment to examine the effect on its characteristics. The optimum yield was obtained from the application of 1:3 of urine and water, and comparable to the synthetic fertilizer (F = 21.78; p = 0.964). The difference in the electrical conductivity of soil was statistically significant (F = 2.324; p = 0.049) after three rounds of applications which should be considered during urine fertilizer utilization. Generally, urine contains nutrients, which can substitute synthetic fertilizer, at a dilution factor of three. However, education should be delivered to enhance public acceptance and to create awareness on urine collection, storage and application for sustainable utilization.