Cover Crops, Green Manures and Mulches

USDA. Sustainable Agriculture Research and Education.

The Library offers "a database of cover crop images, ready-made PowerPoint presentations on cover crop topics, and soil health illustrations."  Resources are free and may be used in outreach and educational activities related to cover crops.

The Pennsylvania State University.

Provides information about the use of cover crops and common cover crop varieties, results of Penn State Extension demonstration trials, research updates, and publications. 

Michigan State University. Kellogg Biological Station.

Provides an overview of cover crops, more detailed information about suitable species, cropping systems and organic research and links to additional sources of information.

North Carolina State University. Cooperative Extension. Chatham County Center.

Fact sheets and resources on selecting and using cover crops in North Carolina and the southeastern region of the U.S., especially for organic production.

University of Hawai'i. College of Tropical Agriculture and Human Resources.

A series of fact sheets divided into leguminous and non-leguminous selections for use as cover crops and green manures.

Oregon State University. Forage Information System.

A collection of publications, experts, media and links covering species, establishment, management, incorporation and removal of cover crops.

University of California. Sustainable Agriculture Research and Education Program.

This database contains information pertaining to 40 crop species derived from journal articles, conference proceedings, standard textbooks, unpublished data and personal communications from researchers and farmers. Plant descriptions, cultural requirements and uses are given for each species.

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 including principal uses and benefits of cover crops and green manures.