"The world record yield for paddy rice production is not held by an agricultural research station or by a large-scale farmer from the United States, but by Sumant Kumar who has a farm of just two hectares in Darveshpura village in the state of Bihar in northern India. His record yield of 22.4 tons per hectare, from a one-acre plot, was achieved with what is known as the System of Rice Intensification (SRI). To put his achievement into perspective, average paddy yield worldwide is about four tons per hectare. Even with the use of fertilizer, average yields are usually not more than eight tons."
Jonathan Latham, "The Next Green Revolution (This Time Without Fossil Fuels)," Solutions Journal, March-April 2013, Volume 4, Issue 2. http://www.thesolutionsjournal.com/node/22521