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Subject listing for: Nutrient Cycles |
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Un artículo de FAR (Foundation for Agronomic Research) que explica el papel de cal agrícola en el suelo.
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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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This e-conference, which is now closed, discussed nutrient depletion as one of the major forms of soil degradation, in particular approaches and methodologies for nutrient balance studies. The site contains a link for the discussion's primary document, "Review on Assessment of Soil Nutrient Depletion and Requirements- approach and methodology," compiled by R.N. Roy and R.V. Misra.
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An excellent introduction to the importance of soil biology in farming sustainability with a worldwide perspective, the home section of this FAO site has links to news, events, documents, case studies, and more.
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This paper outlines what is meant by cation exchage capacity through a definition, measurements and its relationship to fertilization practices.
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This homepage for the Research Group on Soil Fertility and Nutrient Cycling outlines the group's research and describes specific projects.
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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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Ofrece servicios de analisis de suelos.
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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 article in a 1996 edition of Unasylva, a journal published by FAO, discusses the role of agroforestry in nutrient cycling, with a focus on nitrogen and phosphorus, in smallholder maize based systems of Africa.
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This ATTRA publication provides basic descriptions of water, carbon, nitrogen, and phosphorus cycles important in pasture systems and guidelines for pasture management.
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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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Una serie de trípticos de Potash and Phosphate Institute que explican en forma concreta la dinámica de los nutrientes en la planta y en el suelo. Presione el cursor en el nutriente deseado para obtener la información.
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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 soil quality links page is an eclectic listing of links to organizations, information sources, and ongoing discussions on management for soil health.
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ACRES USA discusses the Albrecht Model of soil management. It explains model concepts as well as soil analysis and explanations.
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Outlines the micronutrients needed for field crops, how to detect deficiencies and then how to correct them. Also contains information on zinc, boron, copper, and molybdenum.
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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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New Mexico State University Extension Service provides information on soil analysis. This includes the objectives of soil analysis, limiting factors, carryover, yields to expect, fertilizer labeling as well as how and where to go for soil analysis.
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This University of Florida extension materials main page connects to information on soil fertility, quality, testing, surveys, properties, field methods, nutrient management, plant nutrition, and related topics. Connects to Spanish publications.
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The soil biodiversity and ecosystem functioning page from Colorado State University (USA) focuses on soil ecology of natural systems. It has links pages and an image section of nematodes.
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Designed as an interactive resource for young students of soil science, this comprehensive NASA web site offers links to introductory-level information on a variety of soil science topics. The site also contains numerous resources for soil science educators.
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This Garden with Insight page describes nutrient cycling in the soil patch including nitrogen, phosphorus and carbon (decomposition). Educational simulations for beginning gardeners are available for downloading.
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An article in an on-line journal, "Troubles in the rhizosphere" describes the relationship of tree roots to rhizosphere microbes, especially in relation to tree declines and root diseases. The site links to a version with photos.
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This website is a very readable description of the functional groups of micro- and macro-fauna in the soil, and their role in the soil ecosystem.
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The US Soil and Water Conservation Service's Soil Biology Primer is an introduction to soil biology and ecology, available both in an on-line format and with information on ordering a bound copy.
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This is the homepage of TSBF, a group concerned with the health and fertility of soils in tropical agroecosystems. The site contains links to documents, news, events, products, and services.
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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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