《农桑辑要·典训·先贤务农》
《汜胜之书》： 商汤的时候，发生过旱灾，伊尹创造区田种植法，教导百姓用粪水给区田施肥，背着水浇灌庄稼。 
《氾胜之书》： 汤有旱灾，伊尹作为 区田 ，教民粪种，负水浇稼。 
Shi Sheng Zhi Shu: During the Shang Tang period, there was a drought; Yi Yin created the method of qutian cultivation, teaching people to use human excrement to fertilize their qutian fields and to water their crops with water carried in pails.