You can find scholarly research by searching a large multidisciplinary databases or by a searching smaller, agricultural database.

There are advantages to each database. If I'm really trying to be thorough, I will utilize several databases. 

Note: There may be significant, but not complete, overlap in coverage within these databases.

Best Databases for Finding Agriculture and Food Science Research

Washington State University Libraries' Catalog (Search It) locates pretty much everything you'd hope to find on a subject. This includes journal articles, books, newspapers, multimedia, extension resources, archival materials, etc. 

Web of Science is a very powerful, mostly STEM, database. It is great for finding scholarly research. There is also a lot of useful advanced functionality for those who want to dive deeper.

SEARCH is the USDA National Agricultural Library’s main search tool. It is an open platform that provides access to more than 8 million records covering all aspects of agriculture and related disciplines. It replaces AGRICOLA and PubAg. You can still utilize the old AGRICOLA (EBSCO) database though.

If you are interested in what databases are available to you at WSU, check out this list.

WSU eJournal Search - Search journals by title, word in title, or ISSN