For a great overview on international agricultural law, you may want to begin your research with some other guides and resources listed below:
International Trade in Agriculture Products: A Research Guide, by Lee Peoples, Law Library Director and Frederick Charles HicksvProfessor of Law at Oklahoma City University School of Law, Guide published in 2004
USDA's Guide on International Trade & Organics: Laws and Regulations
If you are conducting research and looking for stats on agriculture or rural development, visit data.worldbank.org for various different search criteria. The site allows you to conduct research and view stats in numerous different formats such as the one pictured below showing the percentage of agricultural land by country. if you go directly to the site, the maps and graphs are in an interactive format.