USDA. Sustainable Agriculture Research and Education.
USDA. NAL. Alternative Farming Systems Information Center.
An overview of the conservation tillage subject including a description, related bibliographies, automated database and Web site searches, search tips, recommended databases and journals, Extension and educational materials and related organizations.
USDA. Natural Resources Conservation Service.
Food and Agriculture Organization of the United Nations. Land and Water Development Division.
"This website provides general concept on the meaning and significance of soil biodiversity, and agriculture emphasizing the need for an integrated soil biological management."
National Center for Appropriate Technology. ATTRA - National Sustainable Agriculture Information Service.
Publications and other resources on how to assess, improve and maintain soil health for both croplands and pastures. Specific topics include soil quality, soil biology, soil organic matter, organic fertilizers and amendments, composting, soil conservation, crop rotation, mulching and nutrient management.
Washington State University.
Current research and publications on the application of soil science principles to agricultural and waste management problems. Topics include composts, biosolids, manure management, pesticide fate in the environment, sustainable agriculture, gardening and soil testing.
Iowa State University. Cooperative Extension Service.
Provides information about soil quality topics including crop rotations, soil amendments, soil health, carbon sequestration and organic agriculture philosophies.
USDA. Economic Research Service.
Describes research on and economic aspects of livestock and poultry manure application to farmland. Provides links to reports and related resources.