Distribution of rice grown in upland, irrigated, rainfed lowland, and deepwater environments. (a) Percentage of rice type categorized by environment planted by continent and (b) in individual countries relative to total land area planted with rice (150 million hectares). Rough grain yield values are averages per country. Data were obtained from the IRRI Social Statistics Database. The information was compiled for 2004–2006 from the FAO 2007 database for rice area Asian country yearbooks and Huke and Huke (1997).