我国南方在解放以后,绿肥发展的很快,在农业生产上所显示的作用越来越大,很多地区,把发展绿肥生产列为建设稳产、高产农田的重要措施。随着农业生产对肥料的大量需要,我国北方各地区,近几年来,对绿肥生产也产生了迫切的要求。但是,人们长期以来,受旧有习惯的影响,认为:我国北方生长期短,年降雨量少,轮作茬口比较紧,因此,对北方能否广泛地、普遍地用种 After the liberation of southern China, green manure developed rapidly and its role in agricultural production has become increasingly evident. In many areas, the development of green manure production has been listed as an important measure to build a stable and productive farmland. With the large amount of fertilizer needed by agricultural production, various regions in the north of our country have also had an urgent demand for green manure production in recent years. However, people have long been influenced by old habits and believe that the northern part of our country has a short growth period, less annual rainfall and relatively tight rotation of crop rotation. Therefore, whether the north can widely and universally use seeds