Artykuły w czasopismach: „Alfisol”

1

Oades, JM, i AG Waters. "Aggregate hierarchy in soils". Soil Research 29, nr 6 (1991): 815. http://dx.doi.org/10.1071/sr9910815.

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An Alfisol, a Mollisol and an Oxisol were fractionated into different particle sizes after a range of disaggregating treatments from gentle to vigorous. The Alfisol and the Mollisol appeared to break down in steps; macroaggregates >250 �m diameter breaking down to microaggregates 20-250 �m diameter before particles <20 �m were released. Vigorous disruption led to particle size distributions similar to those obtained by classical methods used to determine particle size distributions. The Oxisol was stable to rapid wetting treatments but when aggregate disruption was initiated by vigorous treatments particles <20 �m diameter were released and there was no evidence of aggregate hierarchy. Scanning electron microscopy of particles of different sizes showed distinctly single grain particles and aggregates. The microscopic studies indicated the potential role of roots and hyphae in the stabilization of larger aggregates, and for fragments of roots as nuclei for smaller aggregates. Plant debris was not visible in aggregates <20 �m but clay microstructure was evident. It is suggested that aggregate hierarchy occurs in Alfisols and Mollisols because organic materials are the dominant stabilizing agents in larger aggregates but in the Oxisol oxides are dominant stabilizing agents and prevent the expression of aggregate hierarchy caused by organic materials.

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Odiamehi Onokebhagbe, Victor, Kingsley Chinyere Uzoma, Lawal Mubarak, Auwalu Abubakar Kwalam i Habib Dahiru Wakili. "Effects of Poultry Biochar on Electrochemical Properties of an Alfisol and Vertisol of Northern Nigeria". Indonesian Journal of Innovation and Applied Sciences (IJIAS) 1, nr 3 (26.10.2021): 200–207. http://dx.doi.org/10.47540/ijias.v1i3.288.

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This study was aimed to know the effects of biochar on charge properties of an Alfisol and Vertisol of semi-arid soils of Northern Nigeria. A laboratory experiment was conducted to determine the effects of biochar on point zero charge of soils. Experiment was laid out in a complete randomized design and consisted of two factors; 2 soil types and biochar at 4 levels giving a total of 8 treatment combinations with 3 replications each.The results obtained from the study showed that the pH in KCl of the incubated soils ranged from 7.3 to 7.4 and 7.6 to 7.9 for the Alfisol and Vertisol; 7.5 to 7.7 and 7.9 to 8.3 pH in H2O, was obtained for the Alfisol and Vertisol respectively. Electrical conductivity obtained ranged from 3.22 to 4.72 and 2.88 to 4.21 dS m-1 for Alfisol and Vertisol respectively. Electrical potentials ranged from -19.70 to -35 and -31.45 to -63.04 for the Alfisol and Vertisol respectively. The Point Zero Charge of soils correlated positively with the properties of the soils and the biochar rates.The addition of biochar to soils modified the PZC, increased the pH, electrical conductivity (ECe) and cation exchange capacity (CEC) of the soils.

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Ahmed, Nayan, Chandrika Varadachari i Kunal Ghosh. "Soil clayhumus complexes. I. Alkali dissolution, TEM, and XRD studies". Soil Research 40, nr 4 (2002): 691. http://dx.doi.org/10.1071/sr01045.

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Clay-humus complexes from 5 different soils (Entisol, Alfisol, Vertisol, and 2 Mollisols) were isolated by aqueous dispersion. Humic acid (HA) extractable from the complexes by alkali solutions ranging from pH 8 to 14, before and after acid pretreatment, were studied. Extraction by alkali solutions alone was not very effective except with the Alfisol sample. However, pretreatment by acid greatly increased extractability in all samples except the Alfisol. Maximum extraction of HA occurred at pH 12. In the Alfisol sample, clay-HA linkage is probably through hydrogen or other monovalent cation bridges which can be broken by alkali treatment. In Entisol and Mollisol II samples, cation bridging by higher valent, acid-extractable cations is dominant; both these modes are evidenced in the Mollisol I sample. The Vertisol sample has the strongest clay-HA links. TEM studies revealed a reduction in size of the montmorillonite particles in the Vertisol clay-humus complex (compared with humus-free clay); destacking and dispersion of montmorillonite occurred on HA complexation as observed previously for in vitro systems. Relative intensity of the 15� XRD line was much weaker in the Vertisol clay-humus complex than in the clay, lending further support to the fact that that c-stacking is disrupted during complexation of smectite with humus.

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Rahayu, Rahayu, Komariah Komariah i Mei Pujiyarti. "Effect of Pottery Irrigation and Mulching on Melon (Cucumis melo) Growth and Soil Properties of Alfisol and Entisol". JOURNAL OF TROPICAL SOILS 27, nr 3 (13.07.2022): 99. http://dx.doi.org/10.5400/jts.2022.v27i3.99-109.

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The water supply in dry land depends on the rainfall, which causes agricultural constraints and limited water supply. The pottery irrigation method is considered capable of overcoming water shortages during the dry season. Pottery irrigation uses porous clay, so the water slowly comes out of the pottery and wet the surrounding soil. The research aimed to study the influence of pottery subsurface irrigation with and without mulching on watermelon growth and soil properties of clayey soil Alfisol and sandy soil entisol. The research was conducted on July 2019 in the experimental field Faculty of Agriculture, Karanganyar Regency. The experimental research design used a nested design with a 3-factor treatment that were soil type (T), fertilization method (P), and use of mulch (M). The types of soil were Alfisol (T1) and Entisol (T2). The fertilization methods were fertigation 100% (P1), fertigation 50% (P2), and banding fertilization 100% (P3). Mulch application included control, without mulch (M0) and mulch (M1). The combination of P1M1 treatment on alfisol and entisol soil showed the highest soil moisture with values of 23.1% and 22.5%, respectively. The highest fruit weight of melon in alfisol and entisol soils were indicated by the same treatment (P1M1) with values of 580.33 g and 616.5 g, respectively.

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Fasth, William J., Mark B. David i George F. Vance. "Sulfate retention and cation leaching of forest soils in response to acid additions". Canadian Journal of Forest Research 21, nr 1 (1.01.1991): 32–41. http://dx.doi.org/10.1139/x91-005.

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A vacuum extractor was used to examine the effects of increased SO42− deposition on net S retention and cation leaching in three Maine Spodosols (Berkshire, Dixfield, and Rawsonville series) and an Illinois Alfisol. Columns (leached daily for 30 days with either a simulated throughfall solution containing 80 μequiv. SO42−•L−1 (pH = 4.77) or a simulated throughfall solution plus 200 μequiv. H2SO4•L−1 (pH = 3.66)) were constructed using O horizons over upper B (Bh or Bhs) and lower B (Bhs or BC) horizons for the Spodosols and two depth increments of bulked soil (0–12 and 12–25 cm) for the Alfisol. Leachate concentrations of base cations were dominated by Ca2+ and were generally greater in the Alfisol than in the Spodosol leachates. Declining concentrations of base cations and NH4+ with time led to an increase in Al3+ concentrations and a decrease in pH for some of the Spodosol leachates (e.g., leachate Al3+ increased from 19 μequiv. Al3+ •L−1 (day 2) to 194 μtequiv. Al3+ •L−1 (day 30), and pH decreased from 5.53 to 4.41, respectively, for the Dixfield high-S treatment). Columns that received the high-S treatment retained a greater percentage of the added S than those that received the low-S treatment because of increased SO42− adsorption in the former. High rates of net organic S mineralization were found for all soil types (e.g., 169 μg organic S•g−1 over 30 days for the Rawsonville Bhl horizon, 15% of the total S); no treatment effects were found for the amount of S mineralized. Trends in net S retention across soil type (within the same treatment) reflected increases in soil SO42− from adsorption, as well as decreases in organic S from mineralization. When net S mineralization was removed from leaching losses of S, trends in net S retention closely reflected SO42− adsorption differences (50, 23, 8, and 1% of the added S retained by the Rawsonville, Dixfield, and Berkshire series, and the Alfisol, respectively, for the high-S treatment). Because of the low SO42− adsorption capacity of the Alfisol relative to the Spodosols, organic processes were more important in affecting net S retention for the Alfisol. Inorganic processes of S retention were more important for the three Spodosols studied.

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Ahmad, Ayaz, Shahzada Sohail Ijaz i Zhenli He. "Effects of Zeolitic Urea on Nitrogen Leaching (NH4-N and NO3-N) and Volatilization (NH3) in Spodosols and Alfisols". Water 13, nr 14 (12.07.2021): 1921. http://dx.doi.org/10.3390/w13141921.

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Global use of urea nitrogen (N) fertilizer is increasing, but N losses are still very high (40–70%). Zeolites have the capability of holding NH4+, thus reducing N losses when applied as a soil amendment. However, application of a large quantity of zeolite is costly and inconvenient. In this study, zeolitic fertilizers were evaluated to select the best formulation with reduced leaching of NH4-N and NO3-N and NH3 volatilization in agricultural soils (Alfisol and Spodosol). The treatments included the following: T0 = control, T1 = urea fertilizer, T2 = zeo-urea (1:1), T3 = zeo-urea (2:1), T4 = zeo-urea (3:1), T5 = zeo-urea (1:2), and T6 = zeo-urea (1:3). Leaching was performed at 4, 8, 12, 19, 25, 32, 39 and 45 days after the soils were treated with the designated fertilizers, including control, and packed into columns. Leachate samples were collected after each leaching event and analyzed for the concentrations of NH4-N and NO3-N and the quantity of leachate. Ammonia volatilization was recorded at days 1, 5, 9, 13 and 20 of soil treatments. Results indicate that zeolitic fertilizer formulations effectively reduced N losses. NH4-N loss was reduced by 13% and 28% by zeo-urea (1:1) in Alfisol and Spodosol soils, respectively, whereas zeo-urea (2:1) and zeo-urea (3:1) effectively decreased NO3-N leaching in Alfisol. Volatilization loss of NH3 was reduced by 47% in Spodosol and 32% in Alfisol soil with zeo-urea (1:1) as compared with that of urea fertilizer. The results suggest that zeo-urea (1:1) is an effective fertilizer formulation for reducing N losses, especially in Alfisol, as compared with conventional urea fertilizer.

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Rashmi, I., AK Biswas, VRR Parama i AS Rao. "Phosphorus sorption characteristics of some representative soils of south India". SAARC Journal of Agriculture 13, nr 1 (15.07.2015): 14–26. http://dx.doi.org/10.3329/sja.v13i1.24176.

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Studies were conducted to investigate P sorption characteristics of representative soils from ten locations of alfisol and ultisol of India using Langmuir and Freundlich equations. The P sorption maxima (b) of soils derived from Langmuir equation in alfisol varied from 520.6 to 574.7 ?g g-1 and ultisol varied from 561.6 to 678.1 ?g g-1. The maximum phosphorus buffering capacity (MPBC) in alfisol ranged from 80.7 to 180.2 ml ?g-1 and ultisol ranged from 162.1 to 284.4 ml ?g-1. Phosphorus sorption maxima was significantly correlated with clay (r2=0.70), Al (r2= 0.73) and Fe (r2=0.81) forms, MPBC (r2=0.67) and Freundlich constants (r2=0.82). The standard P requirement (SPR) to maintain 0.2 mg l-1 P in soil solution for alfisol ranged from 15.62 to 27.62 mg kg-1 and ultisol from 41.98 to 46.35 mg kg-1. The SPR (0.2 mg l-1) was significantly correlated with binding strength coefficient (r2= 0.97) and binding strength coefficient supporting the fact that energy coefficient of a soil is an important index for planning P management strategies. Among the two soil orders in order to maintain optimum P concentration in soil solution for crop growth, ultisol will be required to supply with more P fertilizer as compared to alfisol.SAARC J. Agri., 13(1): 14-26 (2015)

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Ahmed, Nayan, Chandrika Varadachari i Kunal Ghosh. "Soil clayhumus complexes. II. Bridging cations and DTA studies". Soil Research 40, nr 4 (2002): 705. http://dx.doi.org/10.1071/sr01046.

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Clay-humus complexes, isolated from 5 soils (Entisol, Alfisol, Vertisol, two Mollisols), were extracted with 0.1 n citrate, EDTA, and oxalate at pH 7.0-10.0; amounts of Ca2+, Mg2+, Fe3+/2+, Al3+, as well as humic acid (HA) in the extract were determined. HA extracted increased with pH and varied with nature of ligand; largest amounts were extracted by EDTA at high pH. In the Entisol clay-humus extract, Ca2+ is dominant. In Alfisol sample, Ca2+ and Mg2+ have little role in clay-HA bonding; apart from monovalent cations, bonding is mainly through Fe3+/2+ and Al3+, which are well correlated to HA extracted. The extract from Vertisol sample contains little Fe3+/2+ or Al3+ and major bonding is through Ca2+. In Mollisol I and II, Ca2+, Mg2+, Fe3+/2+, and Al3+ are all involved in bonding and are highly correlated to extracted HA. Difference in mineralogy determines the difference in bonding strength between Alfisol and Vertisol complexes. DTA indicates dual bonding modes. A major fraction of HA (in clay-humus complexes) shows thermal destabilisation due to multiple attachments on the clay surface; a small fraction is also thermally stabilised by ionic bonding with Ca2+/Mg2+ and absence of ring strain in the complex. Only the Alfisol HA does not show thermal stabilisation in the complex.

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Rabbi, Sheikh M. Fazle, Quan Hua, Heiko Daniel, Peter V. Lockwood, Brian R. Wilson i Iain M. Young. "Mean Residence Time of Soil Organic Carbon in Aggregates Under Contrasting Land Uses Based on Radiocarbon Measurements". Radiocarbon 55, nr 1 (2013): 127–39. http://dx.doi.org/10.2458/azu_js_rc.v55i1.16179.

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Radiocarbon is a useful tool for studying carbon dynamics in soil aggregates. The objective of the current study was to determine the mean residence time (MRT) of soil organic carbon (SOC) in macroaggregates and microaggregates under contrasting land uses. Contrasting land uses investigated at Alfisol (equivalent to Dermosol in Australian Soil Classification) sites were native pasture (NP), crop-pasture rotation (CP), and Eucalypt woodland (WL), whereas in Oxisol (Ferrosol in Australian Soil Classification) sites, land uses comprised improved pasture (IP), cropping (CR), and forest (FR). Soil aggregates were separated into macroaggregates (250–2000 μm) and microaggregates (53–250 μm) by wet-sieving, and their14C signatures were determined by accelerator mass spectrometry (AMS). The14C activity in both macro- and microaggregates was >100 pMC, indicating the presence of post-bomb carbon in the soil. The mean residence time (MRT) of SOC in macro- and microaggregates (MRTagg) was on average 68 yr longer in the Oxisol compared with that in the Alfisol. The MRTaggin microaggregates was 10 yr longer than that of macroaggregates in the Alfisol. However, the MRTaggin microaggregates was 50 yr shorter compared to macroaggregates in the Oxisol.The MRT of macro- and microaggregates can be separated into active, slow, and stable SOC pools. Among the 3 SOC pools, the MRT of the stable pool is of higher significance in terms of SOC stabilization in soil aggregates because of its longer MRT. However, isolation and direct MRT estimation of the stable SOC pool is difficult. The MRT of active and slow SOC pools associated with macro- and microaggregates was measured using a SOC mineralization experiment to estimate the MRT of the stable SOC pool under contrasting land uses by applying a mass balance criterion. The MRT of active (MRTA) and slow (MRTS) SOC pools in macro- and microaggregates varied between 1–50 days and 13–38 yr, respectively. The estimated MRT of the stable pool carbon (MRTP) in microaggregates was 897 yr longer compared to that of macroaggregates in the Alfisol. However, in the Oxisol, MRTPin microaggregates was 568 yr shorter than that of macroaggregates. Among the land uses, WL in Alfisol and CR in Oxisol had longer MRTaggand MRTPcompared to other land uses.

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Rabbi, Sheikh M. Fazle, Quan Hua, Heiko Daniel, Peter V. Lockwood, Brian R. Wilson i Iain M. Young. "Mean Residence Time of Soil Organic Carbon in Aggregates Under Contrasting Land Uses Based on Radiocarbon Measurements". Radiocarbon 55, nr 01 (2013): 127–39. http://dx.doi.org/10.1017/s0033822200047858.

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Radiocarbon is a useful tool for studying carbon dynamics in soil aggregates. The objective of the current study was to determine the mean residence time (MRT) of soil organic carbon (SOC) in macroaggregates and microaggregates under contrasting land uses. Contrasting land uses investigated at Alfisol (equivalent to Dermosol in Australian Soil Classification) sites were native pasture (NP), crop-pasture rotation (CP), and Eucalypt woodland (WL), whereas in Oxisol (Ferrosol in Australian Soil Classification) sites, land uses comprised improved pasture (IP), cropping (CR), and forest (FR). Soil aggregates were separated into macroaggregates (250–2000 μm) and microaggregates (53–250 μm) by wet-sieving, and their14C signatures were determined by accelerator mass spectrometry (AMS). The14C activity in both macro- and microaggregates was >100 pMC, indicating the presence of post-bomb carbon in the soil. The mean residence time (MRT) of SOC in macro- and microaggregates (MRTagg) was on average 68 yr longer in the Oxisol compared with that in the Alfisol. The MRTaggin microaggregates was 10 yr longer than that of macroaggregates in the Alfisol. However, the MRTaggin microaggregates was 50 yr shorter compared to macroaggregates in the Oxisol.The MRT of macro- and microaggregates can be separated into active, slow, and stable SOC pools. Among the 3 SOC pools, the MRT of the stable pool is of higher significance in terms of SOC stabilization in soil aggregates because of its longer MRT. However, isolation and direct MRT estimation of the stable SOC pool is difficult. The MRT of active and slow SOC pools associated with macro- and microaggregates was measured using a SOC mineralization experiment to estimate the MRT of the stable SOC pool under contrasting land uses by applying a mass balance criterion. The MRT of active (MRTA) and slow (MRTS) SOC pools in macro- and microaggregates varied between 1–50 days and 13–38 yr, respectively. The estimated MRT of the stable pool carbon (MRTP) in microaggregates was 897 yr longer compared to that of macroaggregates in the Alfisol. However, in the Oxisol, MRTPin microaggregates was 568 yr shorter than that of macroaggregates. Among the land uses, WL in Alfisol and CR in Oxisol had longer MRTaggand MRTPcompared to other land uses.

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GUPTA, ARBIND KUMAR. "Distribution of phosphorus fractions in different soil orders of Indo-Gangetic plains of India". ANNALS OF PLANT AND SOIL RESEARCH 24, nr 2 (1.05.2022): 221–25. http://dx.doi.org/10.47815/apsr.2022.10152.

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The status and distribution of phosphorus fractions in some soil orders and their relationship with soil characteristics under Indo-Gangetic plains of India was studied at Mohanpur, Nadia (W.B.). Soil samples were collected from three depths (0-15, 15-30 and 30-45 cm) covering Entisols, Inceptisols and Alfisols during 2016. Results revealed that soil pH and clay content increased whereas EC and organic carbon tended to decrease with increasing soil depth. Among different phosphorus fractions, Ca-P was dominant contributing 35% and 20% of total phosphorus content in Entisols and Inceptisols, respectively followed by Fe-P, RS-P and OC-P. In Alfisol, Fe-P fraction constituted 21% of the total soil P followed by Ca-P, RS-P and Al-P. The fractions Al-P, RS-P and Ca-P increased whereas organic P decreased with increasing soil depth. Soil pH was positively correlated with Ca-P and negative with Al-P, Fe-P of all the soil orders. Calcium-P was the highest in Entisols (35%) and Inceptisols (20%) while Fe-P (21%) in Alfisols. Among the inorganic P fractions, Ca-P was the dominant contributor to the availability of phosphorus in Entisols and Inceptisols. The dominant fraction for the release of P in Alfisols was iron phosphate. In general, inorganic P fractions increased while organic available P decreased with soil depth. Various P fractions also had relationships among themselves.

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ADEKIYA, A. O., S. O. OJENIYI i T. M. AGBEDE. "SOIL PHYSICAL AND CHEMICAL PROPERTIES AND COCOYAM YIELD UNDER DIFFERENT TILLAGE SYSTEMS IN A TROPICAL ALFISOL". Experimental Agriculture 47, nr 3 (4.05.2011): 477–88. http://dx.doi.org/10.1017/s001447971100041x.

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SUMMARYExperimental data on tillage requirement of cocoyam (Xanthosoma sagittifolium) are needed to identify the most suitable tillage methods for managing the fragile Alfisols of the humid tropics to ensure sustained productivity. Hence, five tillage methods were compared as to their effects on soil physical and chemical properties, and growth and yield of cocoyam on an Alfisol at Owo in the forest-savanna transition zone of southwest Nigeria. The experiment consisted of five tillage methods: manual clearing (MC), manual ridging (MR), manual mounding (MM), ploughing + harrowing (P + H) and ploughing + harrowing twice (P + 2 H) were used for three years at two sites in a randomized complete block design with three replications. In the first two years (2007 and 2008), P + H produced the least soil bulk density and highest growth and yield, whereas in the third year (2009), MC produced the lowest soil bulk density and best performance of cocoyam. Manual clearing produced the best values of soil chemical properties in 2008 and 2009. Averaged over the three years, P + H, MR and MM had lower soil bulk density hence better growth and yield compared with P + 2 H and MC. Over the three years MC, MM, MR and P + H increased cocoyam cormel yield by 10, 21, 23 and 32%, respectively, over P + 2 H.The corresponding increases in corm yield were 7, 15, 13 and 21%, respectively. The multiple regressions revealed that bulk density and moisture content significantly influenced the yield of cocoyam. Soil chemical properties were not significant. Bulk density rather than soil chemical properties dictated the performance of cocoyam in an Alfisol of southwest Nigeria. Soil quality was degraded by P + 2H. For small farms, either MR or MM is recommended while P + H is recommended for large-scale farming of cocoyam.

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K T, MOHANKUMAR. "Impact of low molecular weight organic acids on soil phosphorus release in Inceptisol and Alfisol". ANNALS OF PLANT AND SOIL RESEARCH 24, nr 2 (1.05.2022): 331–36. http://dx.doi.org/10.47815/apsr.2022.10171.

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Secretion of LMWOAs by plants is one of the important mechanisms to make fixed soil phosphorus (P) bioavailable to plant. But the effectiveness of different LMWOAs in enhancing the soil available P varies significantly with the pH of the soil. Therefore the present study was undertaken at ICAR-IARI, New Delhi during 2018-19 to assess the effect of oxalic and citric acid in increasing the soil available phosphorus in two soil orders i.e. Inceptisol and Alfisol, during different intervals of incubation (i.e. 0, 15, 30, 45, 60 and 90 days). The results showed that there was an increasing trend in soil available P release pattern under both the LMWOAs treatments up to 60 and 45 days of incubation in Inceptisol and Alfisol, respectively and after reaching this threshold value, it attained declining trend. Citric acid was found to be most effective than oxalic acid in mobilizing soil phosphorus in the acidic soil (Alfisol), whereas oxalic acid was superior in neutral soil (Inceptisol). With increasing rates of both LMWOAs, the soil available P increased significantly. Thus, the application of LMWOAs will reduce the excess application of phosphorus and its build-up in soils and causing eutrophication of water bodies.

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Rashmi, I., VRR Parama i AK Biswas. "Phosphate sorption parameters in relation to soil properties in some major agricultural soils of India". SAARC Journal of Agriculture 14, nr 1 (7.09.2016): 1–9. http://dx.doi.org/10.3329/sja.v14i1.29549.

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Phosphorus sorption characteristics of some Indian representative agricultural soils belonging to four soil orders namely Vertisol, Inceptisol, Alfisol and Ultisol were investigated for adsorption behaviour of P and sorption data were fitted to Langmuir and Freundlich equations. The Langmuir constant i.e. adsorption maxima was highest for Vertisol (716.85 ?g g-1), followed by Ultisol (633.3 ?g g-1), Alfisol (501.46 ?g g-1) and Inceptisol (522.93 ?g g-1) respectively. The Freundlich k value for Vertisol, Inceptisol, Alfisol and Ultisol were 159.12, 59.41, 110.57 and 181.36 ?g g-1 respectively, whereas the n values were 2.05, 1.92, 2.49 and 3.07 g ml-1 respectively. The phosphate adsorption isotherm gave good fit adopting Langmuir (r2 = 0.96 to 0.99) and Freundlich (r2= 0.95 to 0.99) for the four soils. Phosphorus sorption maxima was significantly correlated with clay (r2=0.70), Al (r2= 0.73) and Fe (r2=0.81) forms, MPBC (r2=0.67) and Freundlich constants (r2=0.82). Among the various soil properties which correlated with P sorption maxima of significance was clay content (r2=0.97) was significantly correlated. The study illustrated that P sorption isotherm in relation to soil properties can be used as a tool of P management in sustainable crop production.SAARC J. Agri., 14(1): 1-9 (2016)

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Das, S. K., Shriniwas Sharma, K. L. Sharma, Neelam Saharan, N. N. Nimbole i Y. V. R. Reddy. "Land use options on a semi-arid Alfisol". American Journal of Alternative Agriculture 8, nr 1 (marzec 1993): 34–39. http://dx.doi.org/10.1017/s0889189300004902.

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AbstractFour land use options—annual cropping, agroforestry, agrihorticulture, and agrosilviculture—were tried on a Land Capability Class IVs Alfisol under rainfed conditions to find a farming system that would be profitable and sustainable. The agrihorticultural system required more cash input but gave a value/cost ratio of 2.16 compared with 1.95 with annual cropping, 1.69 with agroforestry and 1.52 with agrosilviculture. Runoff was 4.9% in the agrihorticultural system, and 10.6% with agroforesty. Economic and soil health considerations led to the conclusion that the agrihorticultural system would be a sustainable land use option for the semi-arid Alfisol However, other options also are profitable, with value/cost ratios of more than 1.50. Therefore, land users can choose among several systems, depending on their desired production level and their investment capacity.

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Alila, P., i K. Azungla Pongener. "INTEGRATED NUTRIENT MANAGEMENT OF PASSIONFRUIT ON ALFISOL". Acta Horticulturae, nr 928 (luty 2012): 155–62. http://dx.doi.org/10.17660/actahortic.2012.928.18.

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Millán, F., J. M. Hétier, R. Moreau, J. Pétard i M. Burguera. "Acidification of a cultivated Alfisol in Venezuela". Communications in Soil Science and Plant Analysis 30, nr 1-2 (styczeń 1999): 183–98. http://dx.doi.org/10.1080/00103629909370195.

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OLSON, K. R., S. R. PHILLIPS i B. K. KITUR. "IDENTIFICATION OF ERODED PHASES OF AN ALFISOL". Soil Science 157, nr 2 (luty 1994): 108–15. http://dx.doi.org/10.1097/00010694-199402000-00006.

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García-López, Ana M., Ramiro Recena i Antonio Delgado. "Soil properties modulate the effect of different carbon amendments on growth and phosphorus uptake by cucumber plant". Spanish Journal of Agricultural Research 20, nr 1 (marzec 2022): e1101-e1101. http://dx.doi.org/10.5424/sjar/2022201-18299.

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Aim of study: Phosphorus (P) is a non-renewable, limited and strategic resource, inefficiently used in agriculture. Organic carbon (C) supply to soil can stimulate microbial activity increasing the mobilization of soil P thus improving its uptake by crops. This work aimed at investigating the effect of different C amendments on P uptake and how may differ depending on soil properties and P fertilization. Area of study: Soils used in this study were collected in SW Spain. Material and methods: An experiment with cucumber was performed involving three factors: (i) C amendment (cellulose, glucose, citric acid and control without amendment), (ii) soil type (Vertisol and Alfisol), and (iii) P supply (unfertilized, and mineral phosphate in form of KH2PO4). Main results: Cellulose or glucose provided the highest P uptake by plants in soils independently of the treatment. Cellulose and glucose addition were effective increasing dry matter (DM) in the Alfisol. Citric acid application decreased development of aerial parts and roots, and P uptake in soils compared with other sources. In the Alfisol, increased P uptake with cellulose was associated to an increased concentration of low molecular weight organic acids, which seemed to be related to microbial activity. Research highlights: Organic amendments affect microbial activity, and P mobilization mechanisms are associated to microorganisms. This explain the improvement of P supply to plants with amendments; these effects, however, are modulated by soil properties and consequently vary depending on soil type.

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Rochman, Allaganur, Joko Maryanto i Okti Herliana. "Serapan Nitrogen dan Fosfor serta Hasil Kedelai Edamame (Glycine max (L.) Merrill) pada Tanah Alfisol akibat Aplikasi Biochar dan Vermikompos". Buletin Palawija 19, nr 1 (31.05.2021): 22. http://dx.doi.org/10.21082/bulpa.v19n1.2021.p22-30.

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Alfisol merupakan jenis tanah dengan kesuburan rendah, namun memiliki potensi untuk perluasan lahan bagi budidaya tanaman kedelai edamame. Aplikasi biochar dan vermikompos digunakan untuk memperbaiki nutrisi tanah dan mensuplai unsur hara pada tanah Alfisol. Penelitian bertujuan untuk mengetahui pengaruh aplikasi biochar dan vermikompos terhadap serapan nitrogen dan fosfor, serta hasil tanaman kedelai edamame (Glycine max (L.) Merrill) pada tanah Alfisol. Penelitian dilaksanakan pada bulan Agustus sampai Desember 2019 di kebun percobaan dan Laboratorium Agronomi dan Hortikultura, Fakultas Pertanian, Universitas Jenderal Soedirman. Penelitian menggunakan rancangan faktorial terdiri dari 2 faktor. Faktor I adalah aplikasi biochar, terdiri dari empat taraf yaitu B0: tanpa biochar, B1: 10 t/ha, B2: 20 t/ha, B3: 30 t/ha. Faktor II adalah aplikasi vermikompos, terdiri dari 3 taraf yaitu V0: tanpa vermikompos, V1: 10 t/ha, V2: 20 t/ha. Variabel yang diamati adalah sifat kimia tanah awal, kadar N dan P tersedia, laju pertumbuhan tanaman (LPT), laju asimilasi bersih (LAB), bobot polong segar per tanaman, jumlah polong per tanaman, serta analisis kadar N dan P jaringan tanaman. Hasil penelitian menunjukkan bahwa dosis biochar hingga 30 t/ha tidak meningkatkan serapan nitrogen, fosfor, dan hasil tanaman, sedangkan vermikompos hingga 20 t/ha meningkatkan kadar P jaringan, P tersedia, dan hasil tanaman, tetapi tidak meningkatkan kadar N jaringan, N tersedia, LPT, dan LAB. Hasil tertinggi diperoleh pada aplikasi biochar 30 t/ha dan 20 t/ha vermikompos. Tidak terdapat interaksi antara vermikompos dengan biochar terhadap pertumbuhan dan hasil tanaman, sehingga dapat diaplikasikan secara secara tunggal.

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Silva Cruz, Joedna, Raimundo Nonato de Assis Júnior, Sammy Sidney Rocha Matias i Jesús Hernán Camacho-Tamayo. "Spatial variability of an Alfisol cultivated with sugarcane". Ciencia e investigación agraria 38, nr 1 (kwiecień 2011): 155–64. http://dx.doi.org/10.4067/s0718-16202011000100015.

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BONSU, M., i K. B. LARYEA. "Scaling the saturated hydraulic conductivity of an alfisol". Journal of Soil Science 40, nr 4 (grudzień 1989): 731–42. http://dx.doi.org/10.1111/j.1365-2389.1989.tb01313.x.

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Lestari, Sri Ayu Dwi, Andy Wijanarko i Dan Henny Kuntyastuti. "Tanggap Pertumbuhan dan Hasil Tiga Varietas Kacang Hijau terhadap Lama Genangan". Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) 47, nr 1 (30.04.2019): 32–38. http://dx.doi.org/10.24831/jai.v47i1.18047.

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The objective of this research was to determine growth and yield responses of three mungbean varieties to waterlogging duration. The experiment was conducted at a screenhouse of ILETRI, Malang, East Java, from October to December 2016 using Alfisol soil from Probolinggo, East Java. The experiment consisted of two factors that were laid out in a factorial randomized complete block design with three replications. The first factor was mungbean varieties, namely Sriti, Vima 1, and Vima 2. The second factor was waterlogging durations, namely 0, 2, 4, and 6 days. The waterlogging treatments started at 20 days after planting. Mungbean plants fertilized with 250 kg Phonska ha-1 at the time of planting. The results showed that waterlogging treatments had negative effects on growth of the three varieties, indicated by a reduction in stem dry weight and leaf dry weight of the plants. Sriti variety was tolerant to waterlogging, Vima 1 was moderate tolerant, and Vima 2 was sensitive.Keywords: Alfisol soil, Vigna radiata, waterlogging stress

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Soedarjo, M. "Growth response of pigeon pea (Cajanus cajan L. Millsp) on saline and alfisol soils". E3S Web of Conferences 306 (2021): 01010. http://dx.doi.org/10.1051/e3sconf/202130601010.

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As an archipelago country, Indonesia is surrounded by abundant saline soils which could be potential for growing food crops. The research work was conducted to study the growth responses of some pigeon pea genotypes on saline soils. The genotypes of Pigeon pea (LG Kidul, Mega, 90024, 91043 and 94028), as treatment, were grown on Alfisol soil (non-saline) and on saline soil. The experiment was carried out using completely randomized design and replicated three times. All data observed were analyzed by employing standard deviation from 3 replicates. The results of present research work revealed a significant growth retardation of pigeon pea when grown on saline soil. All growth parameters, plant height, plant diameter, root dry weight, and shoot dry weight were significantly lower on saline soil than on Alfisol soil. High concentration of Na+ was observed in roots, shoots and leaves of pigeon pea indicating growth retardation and toxicity symptoms of pigeon pea on saline soil was due to Na+.

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Sannazzaro, Analía I., Gonzalo A. Torres Tejerizo, Marina Caballero, Diana Dip, Mariano Pistorio i María Julia Estrella. "Genome Sequence of the Symbiotic Type Strain Mesorhizobium helmanticense CSLC115N Isolated from Lotus corniculatus Nodules". Genome Announcements 6, nr 19 (10.05.2018): e00412-18. http://dx.doi.org/10.1128/genomea.00412-18.

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ABSTRACT Mesorhizobium helmanticense is a novel species that was isolated from root nodules of Lotus corniculatus grown in an alfisol soil from Carbajosa de la Sagrada, a Mediterranean region in the province of Salamanca in northwest Spain. The whole-genome sequence of the type strain M. helmanticense CSLC115N is reported in this study.

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Rahayu, Rahayu, Jauhari Syamsiyah i Livia Dewi. "Soil characteristic and shallot growth with gypsum and zeolite amendments in irrigated saline Alfisol and Inceptisol". Journal of Degraded and Mining Lands Management 8, nr 3 (1.04.2021): 2801–8. http://dx.doi.org/10.15243/jdmlm.2021.083.2801.

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Salinity of soil and irrigation is a factor that may cause a decrease in shallot productivity, so it requires efforts with amendments. This research aimed to determine the effect of gypsum and zeolite amendments on soil and shallot growth with saline irrigation. A pot experiment was conducted in the field using a completely randomized design with three factors. The first factor was two soil types (Alfisol and Inceptisol); the second factor was three shallot cultivars (Brebes, Purbalingga, and Pemalang); and the third factor was two types of soil amendments. The results showed that gypsum and zeolite reduced pH, sodium adsorption ratio (SAR), electric conductivity paste (ECp) and Na of the soils studied. Gypsum and zeolite increased the uptake of N, P and K by shallot plants. The increase of N uptake by applying gypsum on Inceptisol was more effective to Brebes and Purbalingga cultivars than Pemalang cultivar. Gypsum increased the diameter and number of bulbs in Inceptisol. Zeolite and gypsum increased bulb weight of Purbalingga cultivar in Alfisol.

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Supriyadi, Slamet, Bakti Wisnu Widjajani i Eko Murniyanto. "The Effect of Rice Husk Biochar and Cow Manure on Some Soil Characteristics, N and P Uptake and Plant Growth of Soybean in Alfisol". JOURNAL OF TROPICAL SOILS 27, nr 2 (15.03.2022): 59. http://dx.doi.org/10.5400/jts.2022.v27i2.59-65.

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The effect of biochar on dryland in Madura has not been fully assessed. The objective of this study was to investigate the effect of biochar and animal manure on some soil characteristics, namely water content at field capacity, CEC, N total, available P, and N and P absorption, and plant growth of soybean in Alfisol. The research was arranged on a Randomized Completely Block Design (RCBD) with four replications. Rice husk biochar was mixed with cow manure and applied at the range of 2.5 - 10 Mg ha-1. The result showed that biochar (2.5 Mg ha-1) and cow manure (7.5 Mg ha-1) improved soil characteristics, plant growth, and soybean yield by 22%. Cow manure in this study would function as a source of nutrients while rice husk biochar acted as storage of nutrients that were then released slowly to soil solution for plant uptake. It was concluded that the mixture of 2.5 Mg rice husk biochar ha-1 and 7.5 Mg cow manure ha-1 could be the best combination of soil amendments to apply in an Alfisol in Madura.

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SILVA, LÍVIA P. DA, JARBAS H. DE MIRANDA, LUCIANO A. OLIVEIRA i JEFFERSON V. JOSÉ. "Effect of companion ion on nitrate displacement through transport parameters analysis". Engenharia Agrícola 35, nr 1 (luty 2015): 51–62. http://dx.doi.org/10.1590/1809-4430-eng.agric.v35n1p51-62/2015.

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Nitrate is the main form of nitrogen associated with water contamination; the high mobility of this species in soil justifies the concern regarding nitrogen management in agricultural soils. Therefore, the objective of this research was to assess the effect of companion cation on nitrate displacement, by analyzing nitrate transport parameters through Breakthrough Curves (BTCs) and their settings made by numerical model (STANMOD). The experiment was carried out in the Soil and Water Quality Laboratory of the Department of Biosystems Engineering, "Luiz de Queiroz" College of Agriculture in Piracicaba (SP), Brazil. It was performed using saturated soil columns in steady-state flow condition, in which two different sources of inorganic nitrate Ca(NO3)2 and NH4NO3 were applied at a concentration of 50 mg L-1 NO3-. Each column was filled with either a Red-Yellow Oxisol (S1) or an Alfisol (S2). Results are indicative that the companion ion had no effect on nitrate displacement. However, nitrate transport was influenced by soil texture, particle aggregation, solution speed in soil and organic matter presence. Nitrate mobility was higher in the Alfisol (S2).

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Suntoro, Suntoro, Hery Widjianto i Tutik Handayani. "Ketersediaan dan Serapan Mg Kacang Tanah Alfisol dengan Abu Vulkanik Kelud dan Pupuk Organik Amandemen". Agrosains: Jurnal Penelitian Agronomi 19, nr 1 (10.03.2017): 1. http://dx.doi.org/10.20961/agsjpa.v19i1.20920.

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As a result of volcanic eruptions led to the fall of the ash, but there is no much research conducted against nutrient content and the nutrient availability in soil. Disposals of volcanic ash and organic matter are expected fill Mg need in the land. Magnesium In Alfisol is still sufficientless for peanuts. The purpose of this research is study of the impact of volcanic ash and organic fertilizer for the availability and uptake of peanuts Mg in the Alfisol. The experiments did in a greenhouse used completely randomized design with one factor. Data were analyzed with F test rate from 95%, and if the treatments showed significant influenced were continued with rate duncan's multiple range test fence from 95%. The observed variables include the levels of chlorophyll, available Mg and uptake Mg. Research results show that the interaction from treatment chlorophyll content, available Mg and uptake Mg. Based on the findings of the observations of volcanic ash disposals operating significantly impact the availability of magnesium.

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Soedarjo, Muchdar. "Pengaruh Pupuk Anorganik dan Gandasil terhadap Pertumbuhan dan Hasil Umbi Porang (Amorphophallus muelleri Blume)". Jurnal Keteknikan Pertanian Tropis dan Biosistem 10, nr 3 (1.12.2022): 191–99. http://dx.doi.org/10.21776/ub.jkptb.2021.010.03.03.

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Seperti pada tanaman lainnya, pemupukan dengan NPK, hara makro dan mikro lainnya dimaksudkan untuk meningkatkan pertumbuhan dan hasil umbi porang. Unsur hara mikro biasanya diberikan dalam bentuk pupuk yang diberikan melalui penyemprotan, seperti Gandasil. Kajian dilaksanakan di rumah paranet dan bertujuan untuk mengetahui pengaruh pupuk NPK dan pupuk Gandasil terhadap pertumbuhan dan hasil umbi porang di tanah Alfisol. Kajian menggunakan dosis pupuk NPK + ZA dan kombinasi pupuk NPK + ZA dengan Gandasil sebagai perlakuan dan masing-masing perlakuan disusun dalam rancangan acak kelompok dengan 4 kali ulangan. Data dari semua parameter pengamatan dianalisis dengan menggunakan standar deviasi (SD) dari 4 ulangan. Hasil kajian menunjukkan bahwa tinggi tanaman dan diameter batang pada umur 25 hari setelah tanam (HST) dan 50 HST tidak dipengaruhi oleh pemupukan. Pemupukan dengan 200 kg NPK/ha dan 400 kg ZA/ha menghasilkan bobot kering daun, bobot kering batang, diameter umbi, ketebalan umbi dan bobot basah umbi porang tertinggi. Penggunaan pupuk Gandasil melalui tanah tidak diperlukan karena tidak meningkatkan pertumbuhan dan hasil umbi porang di tanah Alfisol.

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Soedarjo, Muchdar. "Pengaruh Pupuk Anorganik dan Gandasil terhadap Pertumbuhan dan Hasil Umbi Porang (Amorphophallus muelleri Blume)". Jurnal Keteknikan Pertanian Tropis dan Biosistem 10, nr 3 (1.12.2022): 191–99. http://dx.doi.org/10.21776/ub.jkptb.2022.010.03.03.

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Seperti pada tanaman lainnya, pemupukan dengan NPK, hara makro dan mikro lainnya dimaksudkan untuk meningkatkan pertumbuhan dan hasil umbi porang. Unsur hara mikro biasanya diberikan dalam bentuk pupuk yang diberikan melalui penyemprotan, seperti Gandasil. Kajian dilaksanakan di rumah paranet dan bertujuan untuk mengetahui pengaruh pupuk NPK dan pupuk Gandasil terhadap pertumbuhan dan hasil umbi porang di tanah Alfisol. Kajian menggunakan dosis pupuk NPK + ZA dan kombinasi pupuk NPK + ZA dengan Gandasil sebagai perlakuan dan masing-masing perlakuan disusun dalam rancangan acak kelompok dengan 4 kali ulangan. Data dari semua parameter pengamatan dianalisis dengan menggunakan standar deviasi (SD) dari 4 ulangan. Hasil kajian menunjukkan bahwa tinggi tanaman dan diameter batang pada umur 25 hari setelah tanam (HST) dan 50 HST tidak dipengaruhi oleh pemupukan. Pemupukan dengan 200 kg NPK/ha dan 400 kg ZA/ha menghasilkan bobot kering daun, bobot kering batang, diameter umbi, ketebalan umbi dan bobot basah umbi porang tertinggi. Penggunaan pupuk Gandasil melalui tanah tidak diperlukan karena tidak meningkatkan pertumbuhan dan hasil umbi porang di tanah Alfisol.

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Ríos, D., C. Pérez i M. Sandoval. "Phytotoxic effect of paper pulp sludge on Alfisol soil". Journal of soil science and plant nutrition 12, nr 2 (2012): 315–27. http://dx.doi.org/10.4067/s0718-95162012000200011.

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Suman, Shruti. "Weed Management Strategies in Pigeonpea under Alfisol and Vertisol". International Journal of Pure & Applied Bioscience 5, nr 6 (30.12.2017): 138–43. http://dx.doi.org/10.18782/2320-7051.5353.

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Schaetzl, Randall J. "Spodosol-Alfisol intergrades: bisequal soils in NE Michigan, USA". Geoderma 74, nr 1-2 (listopad 1996): 23–47. http://dx.doi.org/10.1016/s0016-7061(96)00060-2.

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Sundara, B. "Phosphorus efficiency of sugarcane varieties in a tropical alfisol". Fertilizer Research 39, nr 2 (1994): 83–88. http://dx.doi.org/10.1007/bf00750906.

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Primavesi, O., F. A. F. de Mello i T. Muraoka. "Concentração e acúmulo de alumínio e micronutrientes por feijoeiro (Phaseolus vulgaris L.), em dois solos submetidos a compactação". Anais da Escola Superior de Agricultura Luiz de Queiroz 42, nr 2 (1985): 303–25. http://dx.doi.org/10.1590/s0071-12761985000200001.

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Com a finalidade de observar a influência da compactação do solo sobre a concentração e acúmulo de Al e micronutrientes por 2 cultivares de feijoeiro, crescendo sobre amostras de terra de um Oxisol (LR) e um Alfisol (PVp), sem e com adubo mineral, foi realizado um experimento em vasos, com capacidade para 3,8 litros. Pode ser verificado, na parte aérea ao final do cíclo, uma redução no teor e acúmulo de Al nas parcelas adubadas, e de elevação nas parcelas sem adubo.Nas raízes ocorreu uma redução no acúmulo de Al nas parcelas sem e com adubo, em ambos os solos. A exceção do cobre que apresentou a tendência genérica de aumentar seu teor na parte aérea, com a compactação, os outros elementos apresentaram comportamento específico em função do tipo de solo, nível de fertilidade e cultivar. Ao final do ciclo, pôde ser verificada uma tendência genérica de aumento no acúmulo de Fe e B, e redução de Zn no Oxisol, e redução de Mn, Zn e B no Alfisol, quando considerada a parte aérea. Nas raízes ocorreu uma redução na extração de todos os micronutrientes.

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Setiawan, Jhoni, Teti Arabia i Abubakar Karim. "Karakteristik, Klasifikasi, dan Pengelolaan Tanah yang Terbentuk di Daerah Gunung Api Jaboi Kota Sabang". Jurnal Ilmiah Mahasiswa Pertanian 5, nr 2 (1.05.2020): 283–92. http://dx.doi.org/10.17969/jimfp.v5i2.14854.

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Abstrak. Kota Sabang memiliki luas 12.061,08 ha, yang terdiri dari pulau-pulau kecil, yaitu: Pulau Weh, Pulau Klah, Pulau Rubiah, Pulau Seulako, dan lain-lain. Pulau kecil ini terbentuk karena adanya gerakan vulkanik berupa letusan gunung Seulawah yang mengakibatkan pulau ini terpisah dari daratan Aceh Besar. Penelitian ini bertujuan untuk mengetahui karakteristik, klasifikasi, serta pengelolaan tanah-tanah yang terbentuk di daerah gunung api Jaboi Kota Sabang. Metode yang digunakan yaitu survai deskriptif kuantitatif. Parameter yang diukur di lapangan berupa karakteristik morfologi diantaranya: warna dan kedalaman tanah. Dilaboratorium berupa karakteristik fisika tanah adalah tekstur tanah; karakteristik kimia tanah yaitu C-organik dan kejenuhan basa serta jenis mineral tanah. Hasil penelitian menunjukkan bahwa karakteristik dan klasifikasi tanah Alfisol adalah: (a) epipedon molik karena memiliki solum tanah ≥ 18 cm (23 cm), kandungan C-organik ≥ 0,6% (1,29%), kejenuhan basa ≥ 50% (55,72%) dan value serta chroma ≤ 3 (value 3 dan chroma 3); (b) horison penciri bawah yang dijumpai adalah argilik karena mengandung liat 15%, maka horison argilik 3% lebih liat yang terdapat pada horison Bt dibandingkan horison di atasnya; (c) subordo dikategorikan Udalf, great group Hapludalf, subgroup Typic Hapludalf, famili Typic Hapludalf, berlempung, campuran, isohipertermik. Pengelolaan yang sesuai tanah Alfisol yaitu dengan olah tanah konvensional.Characteristics, Classification, and Management of Soil Formed in Jaboi Volcano Sabang CityAbstract. Sabang City has an area of 12,061.08 ha, which are consists of small islands, namely: Weh Island, Klah Island, Rubiah Island, Seulako Island, and others. This small island was formed due to a volcanic movement in the form of the Seulawah volcano eruption which resulted in the island being separated from the mainland of Aceh Besar. This study aims to determine the characteristics, classification, and management of soils formed in the Jaboi volcano in Sabang City. The method in this research is used a quantitative descriptive survey. The parameters measured in the field in the form of morphological characteristics include: color and depth of the soil. In the laboratory the characteristics of soil physics are soil texture; soil chemical characteristics are C-organic and base saturation and soil mineral types. The results showed that the characteristics and classification of Alfisol soils were: (a) Molic epipedon because it had soil solum ≥ 18 cm (23 cm), C-organic content ≥ 0.6% (1.29%), base saturation ≥ 50% ( 55.72%) and the value and chroma ≤ 3 (value 3 and chroma 3); (b) the lower characteristic horizon found is argillic because it contains clay 15%, the argillic horizon 3% more clay found in the Bt horizon compared to the above horizon; (c) subordo is categorized as Udalf, Hapludalf great group, Typic Hapludalf subgroup, Typic Hapludalf family, clay, mixed, isohipertermic. Appropriate management of Alfisol land is conventional tillage.

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Bassey Anwanane, Nnenne, Kehinde Olayemi Affinnih i John Olajide Olaniyan Olaniyan. "Effect of slope and depth on soil chemical properties of a typical alfisol". Poljoprivreda 23, nr 2 (23.12.2017): 3–9. http://dx.doi.org/10.18047/poljo.23.2.1.

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Nusantara, Canggih Jati, Sumarno Sumarno, Widyatmani Sih Dewi i Sudadi Sudadi. "PENGARUH DOSIS INOKULUM AZOLLA DAN PUPUK FOSFAT ALAM TERHADAP KETERSEDIAAN P DAN HASIL PADI DI ALFISOL". Caraka Tani: Journal of Sustainable Agriculture 29, nr 2 (1.10.2014): 106. http://dx.doi.org/10.20961/carakatani.v29i2.13396.

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Rice production in Indonesia can not cover the national needs. The low productivity caused by the decline in soil fertility. One way to increase the phosphorus content in the soil is to provide natural phosphate fertilizer and Azolla inoculum. This study was conducted to determine the proper dose of Azolla inoculum and rock phosphate to increase the availability of phosphate and increase the yield of rice plants on land Alfisol. This study uses the two-factor factorial CRD comparative treatment of manure and fertilizer N, P, K. Analysis of the observed data using analysis of variance at 5% level and if there is a significant difference effect followed by DMRT 5% level to compare between treatments. The results showed that treatment of Azolla inoculum and phosphate can increase the availability of phosphate in the Alfisol soil and can increase rice yield. On the parameters available P showed the highest results in the treatment of Azolla 2.5 tons / ha without natural phosphate and Azolla 5 tons / ha of natural phosphate 350 kg / ha which is 10.81 ppm. In addition, administration of Azolla inoculum and phosphate levels give rise to CEC, organic matter, total N in the soil and soil pH.

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BHEEMANNA, R., H. V. RUDRAMURTHY, P. H. KUCHNUR i CHANDRAGOUDA GIRIGOUDAR. "Impact of conservational agriculture on hydrological properties of rainfed alfisol". AN ASIAN JOURNAL OF SOIL SCIENCE 12, nr 1 (15.06.2017): 128–34. http://dx.doi.org/10.15740/has/ajss/12.1/128-134.

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Tavares Filho, João, Maria de Fátima Guimarães, Pierre Curmi i Daniel Tessier. "Physical properties of an Alfisol and no-till soybean yield". Revista Brasileira de Ciência do Solo 36, nr 1 (luty 2012): 253–60. http://dx.doi.org/10.1590/s0100-06832012000100026.

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It is known that any kind of soil management causes changes in the soil physical characteristics and can affect agricultural yield. The purpose of this study was to evaluate soil properties of an Alfisol and soybean yield under different management systems for no-tillage annual crops, no-tillage with chiseling and no-tillage crop rotation. The 11-year experiment was initiated in the 1998/99 growing season, on 100 x 30 m plots (11 % slope). Soil samples (5 per management system) were systematically collected (0-25 cm layer) in the summer growing season, to quantify soil organic matter, bulk density, macroporosity and flocculation, as well as soybean yield. The highest values for soil bulk density and organic matter content and the lowest for macroporosity were observed in the no-till system alone, whereas in the no-till system with quarterly chiseling the values for organic matter content were lowest, and no-tillage crop rotation resulted in the highest values for organic matter and macroporosity, and the lowest for soil bulk density. The average soybean yield was highest under no-till and trimestrial chiseling or crop rotation, and lowest for no-tillage annual crops no-tillage annual crops alone.

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Brunel-Saldias, N., I. Martínez, O. Seguel, C. Ovalle i E. Acevedo. "Structural characterization of a compacted alfisol under different tillage systems". Journal of soil science and plant nutrition, ahead (2016): 0. http://dx.doi.org/10.4067/s0718-95162016005000050.

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Liu, F., C. Colombo, P. Adamo, J. Z. He i A. Violante. "Trace Elements in Manganese-Iron Nodules from a Chinese Alfisol". Soil Science Society of America Journal 66, nr 2 (2002): 661. http://dx.doi.org/10.2136/sssaj2002.0661.

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Liu, F., C. Colombo, P. Adamo, J. Z. He i A. Violante. "Trace Elements in Manganese-Iron Nodules from a Chinese Alfisol". Soil Science Society of America Journal 66, nr 2 (marzec 2002): 661–70. http://dx.doi.org/10.2136/sssaj2002.6610.

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Mishra, P. K., S. Siva Prasad, B. Maheswara Babu i L. R. Varalakshmi. "Bentonite as an Ameliorant in an Alfisol—A Laboratory Study". Journal of Irrigation and Drainage Engineering 127, nr 2 (kwiecień 2001): 118–22. http://dx.doi.org/10.1061/(asce)0733-9437(2001)127:2(118).

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Oyeniyi, O. L., i A. O. Aweto. "EFFECTS OF TEAK PLANTING ON ALFISOL TOPSOIL IN SOUTHWESTERN NIGERIA". Singapore Journal of Tropical Geography 7, nr 2 (grudzień 1986): 145–51. http://dx.doi.org/10.1111/j.1467-9493.1986.tb00178.x.

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Schulz, S., G. Tian, B. Oyewole i S. Bako. "Rice mill waste as organic manure on a degraded Alfisol". Agriculture, Ecosystems & Environment 100, nr 2-3 (grudzień 2003): 221–30. http://dx.doi.org/10.1016/s0167-8809(03)00198-1.

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Ley, G. J., i K. B. Laryea. "Spatial variability in penetration resistance of a hardsetting tropical alfisol". Soil and Tillage Research 29, nr 4 (kwiecień 1994): 367–81. http://dx.doi.org/10.1016/0167-1987(94)90109-0.

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Lal, R. "Agroforestry systems and soil surface management of a tropical alfisol:". Agroforestry Systems 8, nr 2 (kwiecień 1989): 97–111. http://dx.doi.org/10.1007/bf00123115.

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Lal, R. "Agroforestry systems and soil surface management of a tropical alfisol:". Agroforestry Systems 8, nr 2 (kwiecień 1989): 113–32. http://dx.doi.org/10.1007/bf00123116.

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