By the Natural Resources Conservation Service, this is more oriented towards natural environments. However, researchers and students in agriculture could find some of it useful, especially scrolling down to the "cover crops" section of the database from the homepage could be fruitful.
PubAg is the U.S. Department of Agriculture, National Agricultural Library's search system for agricultural information. PubAg contains full-text articles relevant to the agricultural sciences, along with citations to peer-reviewed journal articles. The focus is on U.S. government research but also includes research articles published outside of government agencies.
A large database of peer-reviewed literature in all subject areas. In addition to citation searching, it features tools to track, analyze and visualize research. Scopus complements Web of Science and Google Scholar, but each of them contains enough unique information that none of them should be used exclusively.
Finding Peer-Reviewed Research
This video gives an overview on how to use literature databases in general. The video uses 2 different databases as examples: CAB, and PubAg. These two are excellent choices for searching in the agricultural sciences.