The following three databases are great for finding agricultural scholarly research. They are listed in order of most broad to most disciplinary specific. Although you will find significant overlap among these databases each is very useful depending upon your research application.
Search It is the WSU library catalog. You can search among many different types of resources and order materials from other institutions if they are not immediately available through WSU. You will find the most resources in Search It but you will also find the most noise.
This WSU Libraries page has information and tutorials on Search It.
Includes Arts & Humanities, Social Sciences and Science Citation indexes, Journal Citation Reports, BIOSIS Previews, BIOSIS Citation Index, Derwent Innovations patent searching, MEDLINE, and Zoological Record. Updated weekly.
PubMed - PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
AGRICOLA contains bibliographic records from the U.S. Department of Agriculture's National Agricultural Library.
If you are interested in seeing a full list of useful agricultural-related databases, check out this page via the WSU Libraries.