The Arab Agricultural Revolution (also referred to variously as Medieval Green Revolution, Muslim Agricultural Revolution, Islamic Agricultural Revolution or Islamic Green Revolution) is a term coined by the historian Andrew Watson in a 1974 paper postulating a fundamental transformation in agriculture from the 8th century to the 13th century in the Muslim lands. He listed eighteen crops that were widely diffused during the Islamic period, such as durum wheat, Asiatic rice, sorghum, and cotton.