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Subject listing for: Phosphorus |
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This 2003 US Department of Agriculture - Agricultural Research Service publication in pdf format looks at ways to reduce phosphorus losses from agriculture to bodies of water.
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University of Minnesota Extension Service provides a guide to managing phosphorus through crop selection, tillage systems and soil test levels.
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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 information sheet from the Virginia Association for Biological Farming is a practical guide to balanced nutrition for soil and crops.
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Hendrikus Organics offer organic fertilizers, soils, soil amendments, compost teas and tea brewers that help create healthy soils.
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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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LPES is a US national educational program for livestock and poultry advisors built by a team from land grant universities, the US Department of Agriculture, and the MidWest Plan Service. Curriculum materials are available on-line format or for sale in a searchable cd format. Lessons of particular potential interest regard nutrient and manure management.
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This Penn State Cooperative Extension (USA) publication in pdf format describes the phosphorus cycle and the problem of eutrophication.
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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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North Pacific Ag Products is a wholesale distributor of agricultural gypsum products. Their products include rock phospate, gypsum, high calcium pelletized lime, dolomite lime, pelletized gypsum, granulated 9-3-7, granulated steamed bone meal, NP organics and testing.
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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 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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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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Part of the University of Florida's extension material on soil and water, this series provides information on management practices of phosphorous control and phosphorous cycling.
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This 4 page technical pamphlet in pdf format from the US Department of Agriculture Soil Quality Institute discusses the role of phosphorus in agriculture and plant growth, its cycle, and environmental impacts.
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This fact sheet answers the four questions: How often should you sample the soil? Where do you sample a field? What time of year should your samples be collected? How should you sample different tillage systems?
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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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This paper describes the relationship between soybeans and the thirteen mineral nutrients essential for proper soil fertility.
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This 1994 US Department of Agriculture Natural Resources Conservation Technical note contains a decision support tool extension personnel, landowners, and planners can use to assess the risk of phosphorus movement to bodies of water.
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This University of Maryland paper describes the different forms of soil phosphorus, phosphorus addition to soils, phosphorus cycling in soils, and phosphorus losses from the soil.
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