USDA. Natural Resources Conservation Service.
Research summaries, articles, Webinars, and information on soil heath and soil management topics from U.S. land-grant universities.
USDA. Sustainable Agriculture Research and Education.
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.
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.