紫云英是我省种植面积最大的一种高产绿肥作物,其亩产鲜草最高的可达万斤,低的却不过千斤,增产潜力很大。近几年来,由于我省水田油稻稻栽培面积的不断扩大,挤掉了部分紫云英绿肥面积。如黄冈县1966—1976的十年中,紫云英种植面积均在18万亩以上,到1978年已减少到16万亩。其次是由于水田长期种植紫云英绿肥后,土壤理化性状发生了一些变化,而水肥等管理技术未 Astragalus is the largest planting area in our province a high-yielding green manure crop, the highest per mu yield of fresh grass up to ten thousand pounds, but low but jin, a great potential for increase production. In recent years, due to the constant expansion of paddy rice cultivation area in paddy fields in our province, part of the Shiyunying green manure area has been squeezed out. For example, in the ten years from 1966 to 1976 in Huanggang County, the area planted with Astragalus sinicus was above 180,000 mu and reduced to 160,000 mu in 1978. Second, due to the long-term cultivation of purple Yunying green paddy soil, the soil physical and chemical properties of some changes, and management techniques such as water and fertilizer