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根据我们的调查和试验,河南的淮南地区,土壤中缺乏最多的是氮素,耕作层全氮量仅为0.05—0.1%.因此,增施肥料尤其是氮素肥料,增产十分显著.在淮南地区的肥料来源中,人畜粪便、塘泥、土杂粪等农家肥料和硫酸铵等化学肥料尚不能满足作物需要的情况下,发展绿肥,是增辟肥源的重要途径.然而,在河南的淮南地区,人多地少,复种指数较高,多是一年两熟或两年三熟,若是发展绿肥扩大绿肥种植面积,势必发生绿肥作物与粮食作物争地的矛盾,为了探索克服这一矛盾的途径,以求获得粮食、肥料两者双丰收,我们
According to our investigation and test, the most abundant soil is nitrogen in Huainan of Henan Province, and the total nitrogen content in the tillage layer is only 0.05-0.1%. Therefore, the increase of fertilizers, especially nitrogenous fertilizer, is very significant. Fertilizer sources in the region, manure, pond mud, soil manure and other chemical fertilizers such as farm manure and ammonium sulfate can not meet the needs of crops, the development of green manure, is an important way to increase manure source.However, in Henan In Huainan, there are many people with less land, and the multiple cropping index is higher. They are mostly two or three crops a year. If developing green manure expands the planting area of green manures, contradictions between green manure crops and food crops will inevitably occur. In order to explore and overcome this Contradictory approach in order to obtain both grain and fertilizer double harvest, we