稻—稻—绿肥是我省稻田的主要耕作制度。冬季绿肥(紫云英)是我省早稻的主要肥源,种植面积近年稳定在2400万亩左右,约占稻田面积的59.4%。其种植方法长期习惯于9月中、下旬套播在晚稻中,这在晚稻亩产七八百斤以下,可比获得较高的绿肥鲜草产量。然而随着品种、化肥、栽培技术等 Rice - rice - green manure is the main farming system of paddy fields in our province. Winter green manure (Aspen) is the main source of early rice in our province, planting area stabilized at 24 million mu in recent years, accounting for about 59.4% of paddy area. Its growing method has long been accustomed to medium-sowing in late September and late sowing in late rice, which yields less than 78 kilograms per mu in late rice, which is comparable to the yield of fresh green manure grass. However, with varieties, fertilizers, cultivation techniques and so on