《氾胜之书》“区田法”中有“积穰于沟间”语,石声汉对“穰”字存疑,推测其可能作肥料用;万国鼎和缪启愉认为“穰”与区田生产相矛盾,系“壤”字之误。区田法并非大田农业生产的常规方法,而是干旱地区遇到旱灾时的特殊生产设计,或隙地利用技术,对灌溉、供水、施肥、保墒要求较高。“穰”的保水性良好,灌溉条件下可充当水肥担体,不但能契合上述区田技术要求,还可实现节约灌溉、精确供给水肥、持续保泽。同书垫“豆萁”区种芋就是基于这样的设计。现代“穴贮肥水”、“浸水秸秆增墒”等农业新技术与“区田积穰”原理相近或相通。要之,“穰”字无误,其主要功能不是改良土壤,而是保水保肥、保墒增墒。 “Pan-book” “District law ” in the “plot 穰 in the ditch” language, stone sound Han “穰 ” dubious, speculated that it may be used as fertilizer; Wan Guodong and Miao Qiyu that “穰 ” is inconsistent with the district production, Department “soil ” word error. Ward Tian Fa is not a conventional method of agricultural production in the field. Rather, it is a special production design in the event of a drought in arid areas, or using technology in a gap, which has high requirements on irrigation, water supply, fertilization and preservation of soil moisture. “穰 ” good water retention, irrigation conditions can be used as water and fertilizer body, not only meet the technical requirements of the above fields, but also to achieve savings in irrigation, water and fertilizer supply to the exact, continued Bao. With the book pad “bean curd ” kind of taro is based on this design. Modern “new technology” such as “storing fertilizer and water in the hole,” “increasing the moisture in the straw by immersing” and other new agricultural technologies are similar to or similar to the principle of “field plot”. In other words, the word “穰” is correct. Its main function is not to improve the soil, but to keep the water and fertilizers, and to increase the moisture while maintaining moisture.