在北方有“千斤绿肥百斤粮”的农谚,这表明绿肥有明显的增产作用。它不仅为农作物提供氮磷钾等养分,而且增加土壤有机质,有改土培肥之功。 在我国。种植绿肥、以地养地源远流长,早在西周时期,人们就已懂得利用杂草沤制绿肥肥田。在魏晋南北朝时,进而出现栽培绿肥的生产活动,北方开始种植绿豆、小豆、 In the north there is a “proverb of green manure,” which shows that green manure has a distinct yield-increasing effect. It not only provides NPK and other nutrients for crops, but also increases soil organic matter and improves soil fertility. In my country. Planting green manure, in order to cultivate a long history, as early as the Western Zhou Dynasty, people already know how to use weeds to make green manure. In the Wei, Jin and Northern and Southern Dynasties, and then there is the production of green manure cultivation activities, the North began planting mung beans, adzuki beans,