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Subject listing for: Nitrogen |
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This site brings together many links to information on Azotobactor Species and related topics available on the Web. It also provides links to lectures and scientific papers.
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This article is part of the University of Florida's extension material on soils and water. It discusses the importance, magnitude and diversity of nitrogen fixation, as well as symbiotic and non-symbiotic nitrogen fixation.
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This fact sheet helps people to manage manure as a crop nutrient resource, not a waste product. It outlines steps to determine its nutrient content, calculate the proper application rate based on your management objectives, crop yield potential, and soil test values for the field(s) that will receive manure.
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This Michigan State University site gives general information on cover crop management, cover crops and soil, cover crops in cropping systems, and cover crop species.
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Michigan State University Extension answers the basic questions about Nitrogen and its use with cover crops.
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This information sheet from the Virginia Association for Biological Farming is a practical guide to balanced nutrition for soil and crops.
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Los experimentos se realizaron en dos estaciones experimentales del Instituto Agronómico de Saõ Pablo (Brasil) con suelos distintos. Publicado en Terra, Revista de la Sociedad Mexicana de la Ciencia del Suelo, A.C. vol. 20 no. 1 2002 (formato PDF).
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This University of Illinois Extension database contains brief definitions and/or information on topics including compost, mulch, pH levels, soil minerals and elements, manure, green manure crops, and more.
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Una publicación trimestral que divulga información sobre el efecto de P y K en la nutrición de diferentes cultivos, y manejo adecuado de suelos y fertilizantes. Está publicado por el Instituto de Potasio y Fosfato, pero contiene información que puede ser de interés a los productores orgánicos.
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This article explains how organic matter in the soil is turned into plant nutrients and shows how many farm practices reduce organic matter. Includes practical tips on maintaining an adequate supply of organic matter in the soil
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This edition of The Manager, a feature prepared by Cornell University dairy specialists, appeared in the October 2003 edition of Northeast Dairy Business Magazine. It contains links to 10 brief articles discussing manure application, leaching, storage and handling.
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This brief paper, a part of the 1996 Proceedings of the 8th Australian Agronomy Conference in Towoomba, describes the results of an experiment in which soil microbial biomass was measured in response to three different residue treatments through time, as well as discussing aspects of modelling such changes.
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Iowa State University Extension provides a lot of information about nitrogen and phosphorus, including research, publications, state programs, soil temperatures, current news and BMPs.
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Reprinted from a 1997 edition of the Integrated Crop Management Newsletter from Iowa State University (USA) this two page pdf paper discusses nitrogen availability in plant residues and animal manures.
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Available in pdf format this 8 page extension publication from the Oregon State University (USA) describes research using cover crops to capture nitrate from soils in fall and early winter before it can be leached out of the soil by winter rains.
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This site contains three computer models to help growers decide what if any nitrogen (N), phosphorus (P), or potassium (K) fertilizer is needed for their crops. The N and P models can be specialized for different areas of the world, and instructions are available for combining the models to run a N, P, and K simulation.
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Part of the University of Florida's extension materials on soil and water, this nutrient management series provides links to articles regarding management of nutrients in soils: testing, sampling, fertilization, and recommendations.
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An Australian based company working toward a new, more sustainable approach to agriculture.
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This site is a table of contents for nitrogen management related papers presented at the 2001 Australian Agronomy Conference. Topics include nitrogen fixation, nitrogen uptake, yield response, amino-N, nitrate scavenging, and nitrogen response efficiency.
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This FARM Facts extension bulletin through Saskatchewan Agriculture, Food and Rural Revitalization provides an in depth look at nutrients in regards to soil fertility and management, and how to supply vital nutrients organically.
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Colorado State University Extension provides information on how to use organic materials as nitrogen fertilizers, carbon to nitrogen ratios as well as other considerations when adding organic compounds to soils, such as the rate of decomposition and the addition of toxic materials.
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This site provides information about soil properties in sustainable agriculture, and specifically detailed information on nitrogen, phosphorus, and potassium. Insights on how to fertilize organically.
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This outreach "Science You Can Use" article provides an overview of organic matter and specific nutrients as well as requirements for crops (PDF).
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Reporte de un experimento conducido en condiciones de campo en dos localidades experimentales con diferente disponibilidad de fósforo. Publicado en Terra, Revista de la Sociedad Mexicana de la Ciencia del Suelo, A.C. vol. 20 no. 1 2002 (formato PDF).
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This clearly explained and illustrated web-chapter from a New Zealand conservation organization describes the role of soil organisms in the nutrient cycles that characterize farming ecosystems.
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Colorado State University Extension Service provides explanations on their different types of soil tests. Colorado State University routinely analyzes soil samples for pH, soluble salts, organic matter, nitrate nitrogen, phosphorus, potassium, zinc, iron, copper, manganese, lime and soil texture. Additional tests for gypsum and the sodium adsorption ratio (SAR) may be possible.
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New Mexico State University Extension provides information on how to interpret soil tests. It provides information on how to classify pH, salinity, exchangeable sodium, organic matter, texture, and various metals.
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This paper describes the relationship between soybeans and the thirteen mineral nutrients essential for proper soil fertility.
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This FAO soils bulletin is an detailed online book that describes and discusses concepts and strategies for sustainable dryland cropping systems, from soil chemical and biological factors to social and economic issues.
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This 1996 proceedings of the third meeting of the Institute for Biodynamic Research in Copenhagen, Denmark is available on-line and contains 7 papers on nitrogen fixation and nitrogen cycling.
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This Biology Teaching Organisation page from the University of Edinburgh (UK), discusses three common types of mycorrhiza: Orchid mycorrhizas, Arbuscular mycorrhizas, and Ectomycorrhizas, and provides links to further information.
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Developed by the Biology Teaching Organisation (from the University of Edinburgh, UK) this page discusses in depth the processes of nitrogen fixation. It also has photos, illustrations, and links to further information.
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ACRES USA explains the importance of Carbon and Nitrogen and how to achieve the right balance of each nutrient for specific crops.
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Ohio State University's department of Horticulture and Crop Science put out this brief Extension Fact Sheet with tables describing the value of legumes for plowdown nitrogen.
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