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我区常年种植绿肥400—500万亩,其中冬绿肥占60—70%,冬绿肥中又以苕子为主。但苕子历年每亩产种量只有30—40斤,一定程度上影响了绿肥发展。造成苕子产种量不高的原因是多方面的。在自然因素方面,苕子生长后期经常出现的干旱或雨涝,频繁发生的蚜虫、病毒病、叶斑病等病虫害,
My area perennial planting 400-500 million mu of green manure, of which 60-70% winter green manure, winter green manure and prickly heat-based. But razor clam per mu yield only 30-40 pounds, to a certain extent, affected the development of green manure. Prickly heat caused the reason is not high yield in many ways. In terms of natural factors, frequent occurrences of aphids, virus diseases and leaf spot diseases such as drought and floods and frequent occurrences of slugs during the late growth stage of slugs,