|| Soil Foodweb
A consulting and testing service started in 1996 by Dr. Elaine Ingham. They have developed methods of assessing soil health by making direct counts of organisms under a microscope.
|| The USDA's Soil Biology Primer
An introduction to the living component of soil. Includes units describing the soil food web and its relationship to soil health, and units about bacteria, fungi, protozoa, nematodes, arthropods, and earthworms. Suitable for a broad audience including farmers, ranchers, agricultural professionals, resource specialists, conservationists, soil scientists, students, and educators.
|| OMRI, Organic Materials Review Institute
OMRI (a 501(c) nonprofit organization )provides organic certifiers, growers, manufacturers, and suppliers an independent review of products intended for use in certified organic production, handling, and processing.