Bibliographies thématiques / Crops and nitrogen

Littérature scientifique sur le sujet « Crops and nitrogen »

Auteur : Grafiati
Publié le 4 juin 2021
Mis à jour le 31 janvier 2023

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Articles de revues sur le sujet "Crops and nitrogen"

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KUMAR, YOGENDRA. « Nanofertilizers for enhancing nutrient use efficiency, crop productivity and economic returns in winter season crops of Rajasthan ». Annals of Plant and Soil Research 22, no 4 (4 novembre 2020) : 324–35. http://dx.doi.org/10.47815/apsr.2020.10001.

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The results of 600 on-farm trials with 8 crops conducted during winter season in different districts of Rajasthan have proved that the quantity of urea being applied by the farmers to supply nitrogen to the crops can be successfully reduced to half. The yields obtained with 50% less nitrogen plus 2 sprays of nano-nitrogen in standing crops gave yields higher than that applied in most of the 8 crops tested in these trials. Apart from this, effect of the Nano-Zn and Nano-Cu was also evaluated. As the deficiencies of these micronutrients were not universal like nitrogen, the significant responses to these nanofertilizers depended on the magnitude of deficiency of specific micronutrients and the nature of the crops.These results clearly establish that with application of nanofertilizers, the nutrient use efficiency can be significantly enhanced as revealed by 50 per cent saving of urea through 2 sprays of Nano N.Nanofertilizers are considered as a novel approach towards saving of nutrients, in particular nitrogen, and protecting the environment.This paper describes the results of 600 on-farm trials conducted on 8 crops grown during winter season of 2019-20.
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Yamagata, Makoto, et Noriharu Ae. « Nitrogen uptake response of crops to organic nitrogen ». Soil Science and Plant Nutrition 42, no 2 (1 juin 1996) : 389–94. http://dx.doi.org/10.1080/00380768.1996.10415110.

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Kubát, J., J. Klír et D. Pova. « The dry nitrogen yields nitrogen uptake, and the efficacy on nitrogen fertilisation in long-term experiment in Prague ». Plant, Soil and Environment 49, No. 8 (10 décembre 2011) : 337–45. http://dx.doi.org/10.17221/4134-pse.

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Long-term field experiments conducted under different soil and climate conditions and their databases provide invaluable information and are indispensable means in the study of the productivity and sustainability of the soil management systems. We evaluated the results of the dry matter yields of the main products obtained with four variants of organic and mineral fertilisation in three long-term field experiments established in 1955. The experiments differed in the cultivated crops. The period of evaluation was 12 and 16 years (1985–2000), respectively. The productivity of nine-year crop rotation was lower with the fertilised variants than that with the alternative growing of spring wheat and sugar beets. The dry matter yields on the Nil variants, however, were higher in the crop rotation than in the alternate sugar beet and spring wheat growing, apparently due to the symbiotic nitrogen fixation. The dry matter yields of sugar beet and mainly of spring wheat declined in almost all variants of fertilisation in the alternate sugar beet and spring wheat growing, over the evaluated time period. In spite of the relatively high dry matter production, the declining yields indicated a lower sustainability of the alternate cropping system. Both organic and mineral fertilisation increased the production of the cultivated crops. The differences in the average dry matter yields were statistically significant. Both organic and mineral fertilisation enhanced significantly the N-uptake by the cultivated crops. The effectivity of nitrogen input was the highest with the alternate cropping of sugar beet and spring wheat indicating that it was more demanding for the external N-input and thus less sustainable than nine-year crop rotation.
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Tkachuk, Oleksander, et Vitalii Ovcharuk. « ECOLOGICAL POTENTIAL OF GRAIN PEGULUM CROPS IN MODERN INTENSIVE CROP ROTATIONS ». Agriculture and Forestry, no 3 (30 octobre 2020) : 161–71. http://dx.doi.org/10.37128/2707-5826-2020-3-14.

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The article discusses the ecological significance of leguminous crops grown in modern intensive crop rotation. In particular, the area under crops of common leguminous crops in Ukraine and the level of their productivity have been analyzed. A comparison is made with the acreage of the most widespread grain crops. The emphasis of the article is aimed at establishing the level of nitrogen fixation of leguminous crops, which have the largest sown areas in Ukraine. The volume of accumulation by these leguminous crops of by-products in the form of their straw and stubble is also calculated. A comparison is made according to these indicators with the most widespread grain crops grown in Ukraine. The data on the content of the main nutrients in the by-products of leguminous crops - nitrogen, phosphorus, potassium are given. On the basis of these indicators, a calculation was made of the accumulation of the main nutrients in the soil, which can come with the by-products of leguminous crops with an average yield of their seeds. We also compared the obtained indicators with the input of nitrogen, phosphorus and potassium into the soil with by-products of the most common grain crops. Based on this, a conclusion was made about the most effective leguminous crops, the cultivation of which in the modern intensive crop rotation contributes most to the stabilization of the agro-ecological state of the soil. According to the State Statistics Service in Ukraine in 2019, the largest sown area among leguminous crops belonged to peas - 347.0 thousand hectares, which is 61.3% in the structure of all leguminous crops. In total, the sown area for leguminous crops in Ukraine is 566.0 thousand hectares, which is about 2% of the total sown area and this is a very low indicator. Considering the average yield in Ukraine, beans can return more by-products to the soil - 3.5 t/ha, soybeans and peas - by 8.6% less, beans - by 37.1%, and least of all - chickpeas and lentils - 1.7 - 1.8 t/ha. The content of the main macronutrients in the by-products of all leguminous crops is similar and is: nitrogen - 10.0-12.0 kg/t, phosphorus - 3.4-3.6 kg/t, potassium - 4.6-5.0 kg/t. It has been proven that an increase in the area of leguminous crops in an intensive crop rotation will have a positive effect on the agro-ecological state of the soil. In particular, growing beans allows you to get the highest mass of by-products that can be ploughed into the soil - 3.5 t/ha. Also, by-products of beans are characterized by a high content of mineral phosphorus - 3.6 kg/t, which ensures the supply of all mineral phosphorus to the soil - 12.6 kg/ha of all leguminous crops, as well as potassium - 16.5 kg/ha. Soybean by-products are characterized by a high nitrogen content - 12.0 kg/t, phosphorus - 3.6 kg/t and potassium - 5.0 kg/t. This allows, after growing soybeans, to accumulate in the soil with by-products more mineral nitrogen - 38.4 kg/ha. Also, soybeans are characterized by a high symbiotic nitrogen-fixing ability among all leguminous crops - 120 kg/ha. By-products of leguminous crops have a high content of nitrogen - 2.3-2.7 times, phosphorus - 1.5-1.6 times compared to by-products of grain crops. Also, when plowing soybean by-products into the soil, there will be 2 times more mineral nitrogen and 1.1-1.3 times more phosphorus than when plowing winter wheat by-products. Key words: egumes, by-products, nitrogen fixation, nutrients, accumulation, soil.
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Tei, Francesco, Stefaan De Neve, Janjo de Haan et Hanne Lakkenborg Kristensen. « Nitrogen management of vegetable crops ». Agricultural Water Management 240 (octobre 2020) : 106316. http://dx.doi.org/10.1016/j.agwat.2020.106316.

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Jensen, Erik Steen. « Nitrogen Accumulation and Residual Effects of Nitrogen Catch Crops ». Acta Agriculturae Scandinavica 41, no 4 (janvier 1991) : 333–44. http://dx.doi.org/10.1080/00015129109439917.

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Thorup-Kristensen, K. « The effect of nitrogen catch crop species on the nitrogen nutrition of succeeding crops ». Fertilizer Research 37, no 3 (1994) : 227–34. http://dx.doi.org/10.1007/bf00748941.

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Gaskell, Mark, et Richard Smith. « Nitrogen Sources for Organic Vegetable Crops ». HortTechnology 17, no 4 (janvier 2007) : 431–41. http://dx.doi.org/10.21273/horttech.17.4.431.

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Fertilization is the most expensive cultural practice for the increasing numbers of organic vegetable growers in the United States. Nitrogen (N) is the most important and costly nutrient to manage, and cost-effective N management practices are needed for efficient organic vegetable production. There is a wide array of organic N sources available, but they vary in cost, N content, and N availability. Compost and cover crops are commonly used sources of N for vegetables because they are relatively inexpensive and offer additional nutrients or soil improvement qualities in addition to N. Studies have shown that compost quality factors that affect N mineralization vary by source and among different batches from the same source. Compost carbon to N ratio should be equal to or less than 20:1 to assure net short-term mineralization. Cover crops also vary in N content and mineralization rate after incorporation. Leguminous cover crops decompose and release N more rapidly than grass or cereal cover crops at the preheading stage typically incorporated. Even the most efficient N-supplying composts, cover crops, or other organic N sources do not release appreciable N to a subsequent crop beyond 6 to 8 weeks from incorporation, and this burst of early N may not synchronize with N requirements for many vegetable crops. Other potential organic fertilizer N sources have been evaluated for vegetables, and they vary in N cost and N mineralization rate. Materials evaluated include seabird guano, liquid fish, feather meal, corn meal (Zea mays), blood meal, and liquid soybean meal (Glycine max) among others. Of those evaluated, feather meal, seabird guano, and liquid fish stand out as more economical organic sources of available N. Organic sources generally lack uniformity and are bulky, unstable, and inconsistent as a group, and this contributes to additional hidden management costs for organic growers. Liquid organic N sources for use in microirrigation systems may have additional disadvantages caused by loss of valuable nutrient N that is removed by filters.
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Colaço, A. F., et R. G. V. Bramley. « Do crop sensors promote improved nitrogen management in grain crops ? » Field Crops Research 218 (avril 2018) : 126–40. http://dx.doi.org/10.1016/j.fcr.2018.01.007.

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Balbinot Junior, Alvadi Antonio, Milton da Veiga, Anibal de Moraes, Adelino Pelissari, Álvaro Luiz Mafra et Cristiano Dela Piccolla. « Winter pasture and cover crops and their effects on soil and summer grain crops ». Pesquisa Agropecuária Brasileira 46, no 10 (octobre 2011) : 1357–63. http://dx.doi.org/10.1590/s0100-204x2011001000032.

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The objective of this work was to evaluate the effect of winter land use on the amount of residual straw, the physical soil properties and grain yields of maize, common bean and soybean summer crops cultivated in succession. The experiment was carried out in the North Plateau of Santa Catarina state, Brazil, from May 2006 to April 2010. Five strategies of land use in winter were evaluated: intercropping with black oat + ryegrass + vetch, without grazing and nitrogen (N) fertilization (intercropping cover); the same intercropping, with grazing and 100 kg ha-1 of N per year topdressing (pasture with N); the same intercropping, with grazing and without nitrogen fertilization (pasture without N); oilseed radish, without grazing and nitrogen fertilization (oilseed radish); and natural vegetation, without grazing and nitrogen fertilization (fallow). Intercropping cover produces a greater amount of biomass in the system and, consequently, a greater accumulation of total and particulate organic carbon on the surface soil layer. However, land use in winter does not significantly affect soil physical properties related to soil compaction, nor the grain yield of maize, soybean and common bean cultivated in succession.
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Thèses sur le sujet "Crops and nitrogen"

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Stockdale, Elizabeth Anne. « Nitrogen supply for organic crops ». Thesis, University of Edinburgh, 1993. http://hdl.handle.net/1842/27478.

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An integrated series of field, laboratory and pot experiments was carried out between 1990 and 1993 to study the release of nitrogen from organic manures and its subsequent recovery by crops. The aim was to increase understanding of the soil processes controlling N release from manures and therefore enable N supply to be more closely matched to crop demand in organic cropping systems. The study of N release from manures is handicapped by the lack of appropriate methods to measure rates of mineralisation (both net and gross) in the field. The use of isotope dilution techniques under field conditions was found to be difficult due to the slow diffusion of ammonium ions in soils. The release of N from manures was therefore studied indirectly by monitoring plant uptake and changes in the soil mineral N pool. Indices, used to predict N release, were not found to be applicable where additions of manure had been made. Various management strategies aimed at maximising N supply for organic crops were studied. The N released from manures in the first year was shown to be derived mainly from the pool of mineral N added in the manure. The availability of this pool was controlled by the supply of soluble carbon also added in manures, which stimulates the growth of the microbial biomass and therefore leads to immobilisation of the mineral N. The availability of any immobilised N for crop growth is not clear, though some evidence suggested that it was completely recovered by a spring barley crop. The organic N pool of the manure did not seem to be important in supplying N for crop growth in the first year. The use of 15-N-labelled manures enabled the separation of the N taken up by plants into that derived from the soil and that derived from the manure. Manures were labelled non-uniformly by incubation with 15N salts for a short period before application. Where the assumption could not be made that the manure was uniformly labelled, a simple model was developed based on isotope dilution theory, to calculate the percentage of plant N uptake from the manure. 15N was also used to determine the source of the N extracted by a number of methods, used to assess potential N availability.
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Ottman, Michael J., et Stephen H. Husman. « Nitrogen content of green crops ». College of Agriculture, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/204062.

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Application of chemical fertilizer is not permitted in production of crops certified as organic, but green manure crops may be used to supply the nutrient needs of these crops. An experiment was conducted on a commercial farm near Litchfield Park to determine the nitrogen content at plowdown of barley mixed with Austrian winter peas, Magnus peas, and/or Lana woolleypod vetch. The crop was planted on 21 October and sampled for plowdown nitrogen content on 1 March. The peas and vetch comprised less than 10% of the dry weight of the mixture since the barley grew more vigorously. The barley contained 66 lbs N/acre in the forage while the legumes in the mixture contained 16 lbs N/acre on average. The amount of N in the green manure, even if 100% was available, was not enough to supply the needs of a 2 bale/acre organic cotton crop. The planting date, plowdown date, or species composition in the green manure mixture needs to be altered for green manure to supply the N needs of organic cotton.
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Ishikawa, Shoko. « Nitrogen management of strobilurin-treated wheat crops ». Thesis, Harper Adams University College, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417586.

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Zhao, Shan. « Nitrogen nutrition of hybrid poplars ». Online access for everyone, 2006. http://www.dissertations.wsu.edu/Thesis/summer2006/S%5FZhao%5F072906.pdf.

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Mooleki, Siyambango Patrick. « Synchronization of nitrogen availability and plant nitrogen demand, nitrogen and non-nitrogen effects of lentil to subsequent wheat crops ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0029/NQ63902.pdf.

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Vaughan, Jeffrey David. « Management and assessment of winter cover crop systems for supplying nitrogen to corn in the mid-Atlantic region of the United States ». Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07212009-040446/.

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Scott, David Andrew. « Estimating Soil Nitrogen Supply and Fertilizer Needs for Short-Rotation Woody Crops ». Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/29402.

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Short-rotation woody crops are becoming important supplies of hardwood fiber, but little is known about the early nutritional needs of these systems, especially on different site types. The study objectives were, on two young (ages 3-6) sweetgum plantations with contrasting soil types, to 1) determine the plant growth and foliar nutrition response to repeated nitrogen (N) fertilizer applications, 2) determine soil N supply, plant N demand, foliar N resorption, and soil and fertilizer uptake efficiencies, and 3) test a simple N supply model. In order to expand the findings to the range of sweetgum site types, the study objectives were also to 4) evaluate rapid methods for determining N mineralization potential, 5) characterize the soils of 14 sweetgum site types in the Atlantic coastal plain, and 6) review current N fertilizer prescriptions in forestry and recommend strategies for improvement. Two young sweetgum (Liquidambar styraciflua L.) plantations on a converted agricultural field and a pine cutover site in South Carolina were fertilized biannually with three rates of N fertilizer (0, 56, 112 kg N per ha). Fertilization doubled foliar biomass and leaf area on the cutover pine site in the years fertilizer was applied, and stem biomass increased 60%. Critical values, the N concentration required for 90% of optimum growth, is approximately 1.75%. Foliar N uptake increased at both sites when fertilizer was applied. Modeled annual soil N supply was within 20% of that measured on the two plantations even though monthly N supply was not accurately estimated. Potential N mineralization was accurately estimated with a 3-day incubation of rewetted soils that were previously dried, but not by hot salt extraction or anaerobic incubation. Across a spectrum of 14 sweetgum sites, the agricultural fields had lower mineralizable nitrogen (126 kg per ha) than the cutover sites (363 kg per ha). Current N fertilizer prescriptions are not sufficient for repeated fertilizer applications to fast-growing hardwood plantations, but simple models of soil N supply and an N-balance approach may improve prescriptions.
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Waddill, Dan W. « Nitrogen cycling in tall fescue turf with added clippings ». Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07212009-040500/.

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Watkins, Naomi K. « The influence of crops on gross rates of nitrogen mineralisation ». Thesis, University of Reading, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333588.

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Asebedo, Antonio Ray. « Development of sensor-based nitrogen recommendation algorithms for cereal crops ». Diss., Kansas State University, 2015. http://hdl.handle.net/2097/19229.

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Doctor of Philosophy
Department of Agronomy
David B. Mengel
Nitrogen (N) management is one of the most recognizable components of farming both within and outside the world of agriculture. Interest over the past decade has greatly increased in improving N management systems in corn (Zea mays) and winter wheat (Triticum aestivum) to have high NUE, high yield, and be environmentally sustainable. Nine winter wheat experiments were conducted across seven locations from 2011 through 2013. The objectives of this study were to evaluate the impacts of fall-winter, Feekes 4, Feekes 7, and Feekes 9 N applications on winter wheat grain yield, grain protein, and total grain N uptake. Nitrogen treatments were applied as single or split applications in the fall-winter, and top-dressed in the spring at Feekes 4, Feekes 7, and Feekes 9 with applied N rates ranging from 0 to 134 kg ha[superscript]-1. Results indicate that Feekes 7 and 9 N applications provide more optimal combinations of grain yield, grain protein levels, and fertilizer N recovered in the grain when compared to comparable rates of N applied in the fall-winter or at Feekes 4. Winter wheat N management studies from 2006 through 2013 were utilized to develop sensor-based N recommendation algorithms for winter wheat in Kansas. Algorithm RosieKat v.2.6 was designed for multiple N application strategies and utilized N reference strips for establishing N response potential. Algorithm NRS v1.5 addressed single top-dress N applications and does not require a N reference strip. In 2013, field validations of both algorithms were conducted at eight locations across Kansas. Results show algorithm RK v2.6 consistently provided highly efficient N recommendations for improving NUE, while achieving high grain yield and grain protein. Without the use of the N reference strip, NRS v1.5 performed statistically equal to the KSU soil test N recommendation in regards to grain yield but with lower applied N rates. Six corn N fertigation experiments were conducted at KSU irrigated experiment fields from 2012 through 2014 to evaluate the previously developed KSU sensor-based N recommendation algorithm in corn N fertigation systems. Results indicate that the current KSU corn algorithm was effective at achieving high yields, but has the tendency to overestimate N requirements. To optimize sensor-based N recommendations for N fertigation systems, algorithms must be specifically designed for these systems to take advantage of their full capabilities, thus allowing implementation of high NUE N management systems.
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Livres sur le sujet "Crops and nitrogen"

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Food, Ontario Ministry of Agriculture and. Nitrogen fertilizer materials for field crops. S.l : s.n, 1990.

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Sullivan, Dan M. Nitrogen uptake and utilization by Pacific Northwest crops. [Corvallis, Or.] : Oregon State University Extension, 1999.

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1945-, Lemaire Gilles, dir. Diagnosis of the nitrogen status in crops. Berlin : Springer, 1997.

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Emerich, David W. Nitrogen fixation in crop production. Sous la direction de American Society of Agronomy, Crop Science Society of America et Soil Science Society of America. Madison, WI : American Society of Agronomy, 2009.

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Lemaire, Gilles, dir. Diagnosis of the Nitrogen Status in Crops. Berlin, Heidelberg : Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60684-7.

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United States. Agricultural Research Service. Working Conference. Nitrogen research 1989 : Current advances and future priorities : technical report of a USDA-Agricultural Research Service Working Conference, held May 23-25, 1989, St. Louis, Missouri. Washington, D.C.?] : Agricultural Research Service, U.S. Dept. of Agriculture, 1989.

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Bridger, Jeffrey C. Pennsylvania farms and improved nitrogen management. University Park, Pa : College of Agricultural Sciences, Dept. of Agricultural Economics and Rural Sociology, 1995.

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Rauschkolb, Roy S. Nitrogen management in irrigated agriculture. New York : Oxford University Press, 1994.

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Scarisbrick, David. Crop response to nitrogen fertilizer. Ashford : Wye College Department of Agriculture, 1987.

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Svensson, Kjell Sjödahl. Do plants affect nitrogen mineralization ? Uppsala : Institution för ekologi och miljövård, Sveriges lantbruksuniversitet, 1993.

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Chapitres de livres sur le sujet "Crops and nitrogen"

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Tanveer, Asif, Hafiz Haider Ali et Rao Muhammad Ikram. « Nitrogen Fixation in Nutrient Management ». Dans Agronomic Crops, 195–206. Singapore : Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9783-8_11.

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Khan, Muhammad Naeem, Muhammad Ijaz, Qasim Ali, Sami Ul-Allah, Abdul Sattar et Shakeel Ahmad. « Biological Nitrogen Fixation in Nutrient Management ». Dans Agronomic Crops, 127–47. Singapore : Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9783-8_8.

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Shahzad, Ahmad Naeem, et Shakeel Ahmad. « Tools and Techniques for Nitrogen Management in Cereals ». Dans Agronomic Crops, 111–26. Singapore : Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9783-8_7.

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Cruz, P., et J. F. Soussana. « Mixed Crops ». Dans Diagnosis of the Nitrogen Status in Crops, 131–44. Berlin, Heidelberg : Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60684-7_8.

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Kluson, Robert A. « Intercropping Allelopathic Crops with Nitrogen-Fixing Legume Crops ». Dans ACS Symposium Series, 193–210. Washington, DC : American Chemical Society, 1994. http://dx.doi.org/10.1021/bk-1995-0582.ch015.

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Lightfoot, David A. « Nitrogen Fixation and Assimilation ». Dans Genomics and Breeding for Climate-Resilient Crops, 395–413. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37048-9_11.

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Castellano-Hinojosa, Antonio, Clayton J. Nevins et Sarah L. Strauss. « Influence of Cover Crops on Nitrogen Cycling and the Soil Microbial Community ». Dans Nitrogen Cycle, 264–83. First edition. | Boca Raton : CRC PRESS, 2021. : CRC Press, 2021. http://dx.doi.org/10.1201/9780429291180-12.

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Sprent, J. I., J. H. Stephens et O. P. Rupela. « Environmental effects on nitrogen fixation ». Dans World crops : Cool season food legumes, 801–10. Dordrecht : Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2764-3_64.

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Hardarson, Gudni, Seth K. A. Danso et Felipe Zapata. « Biological Nitrogen Fixation in Field Crops* ». Dans CRC Handbook of Plant Science in Agriculture, 165–92. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9780429286384-9.

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Meynard, J. M., C. Aubry, E. Justes et M. Le Bail. « Nitrogen Diagnosis and Decision Support ». Dans Diagnosis of the Nitrogen Status in Crops, 147–61. Berlin, Heidelberg : Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60684-7_9.

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Actes de conférences sur le sujet "Crops and nitrogen"

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Sawyer, John E. « Fertilizing Crops in the New Price Age - Nitrogen ». Dans Proceedings of the 19th Annual Integrated Crop Management Conference. Iowa State University, Digital Press, 2008. http://dx.doi.org/10.31274/icm-180809-943.

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Ellsworth, Jason, Kip Balkcom et Alfred M. Blackmer. « Fertilization to Rescue Corn Crops Following Losses of Fall Nitrogen ». Dans Proceedings of the 10th Annual Integrated Crop Management Conference. Iowa State University, Digital Press, 1999. http://dx.doi.org/10.31274/icm-180809-660.

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Lysenko, Vitalii, Oleksiy Opryshko, Dmytro Komarchuk, Nadiia Pasichnyk, Nataliia Zaets et Alla Dudnyk. « Usage of flying robots for monitoring nitrogen in wheat crops ». Dans 2017 9th IEEE International Conference on Intelligent Data Acquisition and Advanced Computing Systems : Technology and Applications (IDAACS). IEEE, 2017. http://dx.doi.org/10.1109/idaacs.2017.8095044.

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Reyniers, Mieke, Els Vrindts, Josse de Baerdemaeker et Pol Darius. « Fine-scaled optical detection of nitrogen stress in grain crops ». Dans Remote Sensing, sous la direction de Manfred Owe, Guido D'Urso, Jose F. Moreno et Alfonso Calera. SPIE, 2004. http://dx.doi.org/10.1117/12.510648.

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Qi, Zhiming, et Matthew J. Helmers. « Effects of Cover Crops in Reducing Nitrate-Nitrogen Leaching in Iowa ». Dans Proceedings of the 19th Annual Integrated Crop Management Conference. Iowa State University, Digital Press, 2008. http://dx.doi.org/10.31274/icm-180809-947.

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Berger, K., Z. Wang, M. Danner, M. Wocher, W. Mauser et T. Hank. « Simulation of Spaceborne Hyperspectral Remote Sensing to Assist Crop Nitrogen Content Monitoring in Agricultural Crops ». Dans IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2018. http://dx.doi.org/10.1109/igarss.2018.8518537.

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Prikhodko, A. V., et N. V. Karaeva. « Overview of various crops used for green manure ». Dans CURRENT STATE, PROBLEMS AND PROSPECTS OF THE DEVELOPMENT OF AGRARIAN SCIENCE. Federal State Budget Scientific Institution “Research Institute of Agriculture of Crimea”, 2020. http://dx.doi.org/10.33952/2542-0720-2020-5-9-10-41.

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The aim of our research was to determine the influence of different green manure crops on the process of organic matter entry into the soil, changes in physical and chemical properties of soil, etc. The yields of green mass of sweet clover and sainfoin were the highest – 29.1 and 27.1 t/ha, respectively. Triticale and rye surpassed these crops in the dry matter yield by 0.10-0.30 t/ha and in the organic matter entry into the soil by 0.16-0.36 t/ha. Incorporation of green manures into a farming system contributed to the increase in the amount of nitrogen that is available to the succeeding crop from 0.17 to 1.73 mg/100 g, or 10.4 times. The most considerable increase in the amount of nitrogen was after sainfoin (13.5 times more) and vetch (12.3 times higher). The higher Р2О5 and К2О content in the soil was observed after phacelia used for green manure (3.27 and 32.7, respectively).
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Ion, Viorel. « MAIZE BIOMASS YIELD AT DIFFERENT PRECEDING CROPS, ROW SPACING AND NITROGEN CONDITIONS ». Dans 17th International Multidisciplinary Scientific GeoConference SGEM2017. Stef92 Technology, 2017. http://dx.doi.org/10.5593/sgem2017/42/s17.050.

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Thomas Harter, Harley Davis, Marsha C. Mathews et Roland D. Meyer. « Monitoring Shallow Groundwater Nitrogen Loading from Dairy Facilities with Irrigated Forage Crops ». Dans 2001 Sacramento, CA July 29-August 1,2001. St. Joseph, MI : American Society of Agricultural and Biological Engineers, 2001. http://dx.doi.org/10.13031/2013.3828.

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Litvinskiy, V. A., et V. V. Nosikov. « IRMS identification of the type of fertilizer – the source of nitrogen for crops ». Dans CURRENT STATE, PROBLEMS AND PROSPECTS OF THE DEVELOPMENT OF AGRARIAN SCIENCE. Federal State Budget Scientific Institution “Research Institute of Agriculture of Crimea”, 2019. http://dx.doi.org/10.33952/09.09.2019.32.

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Rapports d'organisations sur le sujet "Crops and nitrogen"

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Mallarino, Antonio, Richard Cruse, Dan Jaynes, John Sawyer et Pablo Barbieri. Impacts of Cover Crops on Phosphorus and Nitrogen Loss with Surface Runoff. Ames : Iowa State University, Digital Repository, 2015. http://dx.doi.org/10.31274/farmprogressreports-180814-1832.

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Nair, Ajay, et Vince Lawson. Quantifying Nitrogen Scavenging Benefits of Cover Crops in the Mississippi River Basin. Ames : Iowa State University, Digital Repository, 2015. http://dx.doi.org/10.31274/farmprogressreports-180814-2769.

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Nair, Ajay, Kathleen Delate, Georgeanne Artz et Corene Bregendahl. Assessing Nitrogen Credits from Clover Cover Crops and Effects of Seed Inoculation. Ames : Iowa State University, Digital Repository, 2015. http://dx.doi.org/10.31274/farmprogressreports-180814-2791.

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Meischen, S. J., et K. R. Byrd. Nitrogen accumulation profiles of selected grain and vegetable crops : A bibliography (1940-1992). Office of Scientific and Technical Information (OSTI), octobre 1994. http://dx.doi.org/10.2172/10190381.

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Castellano, Mike J., Abraham G. Shaviv, Raphael Linker et Matt Liebman. Improving nitrogen availability indicators by emphasizing correlations between gross nitrogen mineralization and the quality and quantity of labile soil organic matter fractions. United States Department of Agriculture, janvier 2012. http://dx.doi.org/10.32747/2012.7597926.bard.

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A major goal in Israeli and U.S. agroecosystems is to maximize nitrogen availability to crops while minimizing nitrogen losses to air and water resources. This goal has presented a significant challenge to global agronomists and scientists because crops require large inputs of nitrogen (N) fertilizer to maximize yield, but N fertilizers are easily lost to surrounding ecosystems where they contribute to water pollution and greenhouse gas concentrations. Determination of the optimum N fertilizer input is complex because the amount of N produced from soil organic matter varies with time, space and management. Indicators of soil N availability may help to guide requirements for N fertilizer inputs and are increasingly viewed as indicators of soil health To address these challenges and improve N availability indicators, project 4550 “Improving nitrogen availability indicators by emphasizing correlations between gross nitrogen mineralization and the quality and quantity of labile organic matter fractions” addressed the following objectives: Link the quantity and quality of labile soil organic matter fractions to indicators of soil fertility and environmental quality including: i) laboratory potential net N mineralization ii) in situ gross N mineralization iii) in situ N accumulation on ion exchange resins iv) crop uptake of N from mineralized soil organic matter sources (non-fertilizer N), and v) soil nitrate pool size. Evaluate and compare the potential for hot water extractable organic matter (HWEOM) and particulate organic matter quantity and quality to characterize soil N dynamics in biophysically variable Israeli and U.S. agroecosystems that are managed with different N fertility sources. Ultimately, we sought to determine if nitrogen availability indicators are the same for i) gross vs. potential net N mineralization processes, ii) diverse agroecosystems (Israel vs. US) and, iii) management strategies (organic vs. inorganic N fertility sources). Nitrogen availability indicators significantly differed for gross vs. potential N mineralization processes. These results highlight that different mechanisms control each process. Although most research on N availability indicators focuses on potential net N mineralization, new research highlights that gross N mineralization may better reflect plant N availability. Results from this project identify the use of ion exchange resin (IERs) beads as a potential technical advance to improve N mineralization assays and predictors of N availability. The IERs mimic the rhizosphere by protecting mineralized N from loss and immobilization. As a result, the IERs may save time and money by providing a measurement of N mineralization that is more similar to the costly and time consuming measurement of gross N mineralization. In further search of more accurate and cost-effective predictors of N dynamics, Excitation- Emission Matrix (EEM) spectroscopy analysis of HWEOM solution has the potential to provide reliable indicators for changes in HWEOM over time. These results demonstrated that conventional methods of labile soil organic matter quantity (HWEOM) coupled with new analyses (EEM) may be used to obtain more detailed information about N dynamics. Across Israeli and US soils with organic and inorganic based N fertility sources, multiple linear regression models were developed to predict gross and potential N mineralization. The use of N availability indicators is increasing as they are incorporated into soil health assessments and agroecosystem models that guide N inputs. Results from this project suggest that some soil variables can universally predict these important ecosystem process across diverse soils, climate and agronomic management. BARD Report - Project4550 Page 2 of 249
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Mallarino, Antonio P., Enrique Ortiz-Torres et Kenneth T. Pecinovsky. Effects of Crop Rotation and Nitrogen Fertilization on Crop Production. Ames : Iowa State University, Digital Repository, 2005. http://dx.doi.org/10.31274/farmprogressreports-180814-138.

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Mallarino, Antonio P., et David Rueber. Impacts of Crop Rotation and Nitrogen Fertilization on Crop Production. Ames : Iowa State University, Digital Repository, 2002. http://dx.doi.org/10.31274/farmprogressreports-180814-458.

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Mallarino, Antonio P., et Kenneth T. Pecinovsky. Effects of Crop Rotation and Nitrogen Fertilization on Crop Production. Ames : Iowa State University, Digital Repository, 2002. http://dx.doi.org/10.31274/farmprogressreports-180814-493.

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Sawyer, John E., Jose L. Pantoja et Daniel W. Barker. Nitrogen Fertilization of Corn Grown with a Cover Crop. Ames : Iowa State University, Digital Repository, 2011. http://dx.doi.org/10.31274/farmprogressreports-180814-1081.

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Sawyer, John E., Jose L. Pantoja et Daniel W. Barker. Nitrogen Fertilization of Corn Grown with a Cover Crop. Ames : Iowa State University, Digital Repository, 2010. http://dx.doi.org/10.31274/farmprogressreports-180814-1531.

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