The University of Missouri (USA) publish a comprohensive listing of public articles in many areas like agriculture, natural resources,  lawn and garden, communities...
Only In agriculture specifically it has sections like: Agricultural business, Animals, Crops, Energy, Equipment and facilities, Fisheries and aquaculture, Horticulture, Pests and diseases,  Soil and water.
It has a simple search facility that allows looking for any word.

Very interesting and detailed articles to browse and search, many are free and downloadable, others pdfs are sold in a wide range of prices