The creatures living in the soil are critical to soil health. They affect soil structure and therefore soil erosion and water availability. They can protect crops from pests and diseases. They are central to decomposition and nutrient cycling and therefore affect plant growth and amounts of pollutants in the environment. Finally, the soil is home to a large proportion of the world's genetic diversity.
Soil Biology Primer
The online 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 chapters describing the soil food web and its relationship to soil health and chapters about soil bacteria, fungi, protozoa, nematodes, arthropods, and earthworms.
The online Primer includes all of the text of the printed 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. Printed copies of the Soil Biology Primer may be purchased from the Soil and Water Conservation Society www.swcs.org.
=> Copyright restrictions: Many photographs in the online Soil Biology Primer cannot be used on other Web sites or for other purposes without explicit permission from the copyright owners. Please contact the Soil and Water Conservation Society at firstname.lastname@example.org for assistance with copyrighted (credited) images tagged throughout the online Primer.
=> The text, graphs, tables, non-credited photos, and graphics from USDA sources may be used freely; however, please credit the Soil Biology Primer or this Web site.
The Natural Resources Conservation Service, with assistance from the Conservation Technology Information Center, provided leadership for this project. The Natural Resources Conservation Service and the Soil and Water Conservation Society thank many individuals, including the following, for their contributions.
Elaine R. Ingham
Andrew R. Moldenke, Oregon State University
Clive A. Edwards, The Ohio State University
Arlene J. Tugel, Natural Resources Conservation Service
Ann M. Lewandowski, Natural Resources Conservation Service
Deb Happe-vonArb, Soil and Water Conservation Society
Nancy K. Marshall, Marshall Designs