The FAOSTAT database provides time-series and cross sectional data for some 200 countries including up-to-date data and comprehensive notes on: agricultural production; agriculture & food trade; commodity balances; food supply; food balance sheets; producer prices; land; means of production; exports of cereals by source and destination; forestry trade flows etc. There is also links to other FAO statistical databases including: AQUASTAT, FishSTAT (FIGIS), PriceSTAT and ProdSTAT.
There are also links to the World Census of Agriculture which provides results for the national censuses of around 80 countries and CountrySTAT which is a national statistical information system for food and agriculture which harmonizes and integrates data on food and agriculture coming from different source for some developing countries.
Freely available data on internet. Some registration may be required.