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An online textbook published by the USDA National Resources Conservation Service.  A great resource for teaching about soil fertility.

The Soil Biology Primer is an introduction to the living component of soil and how it contributes to agricultural productivity, and air and water quality. The Primer includes units describing the soil food web and its relationship to soil health, and units about bacteria, fungi, protozoa, nematodes, arthropods, and earthworms. It is suitable for a broad audience including farmers, ranchers, agricultural professionals, resource specialists, conservationists, soil scientists, students, and educators. Starting with The Soil Food Web, use the navigation links above to access the web-based version of the Primer and additional resources. This on-line version includes all of the text of the original, but not all of the images of the soil organisms. The full story of the soil food web is more easily understood with the help of the illustrations in the printed version.

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