在现代农业生产中,长期过多使用无机氮肥,将破坏土壤结构,造成土壤板结,只有有机氮肥和无机氮肥的配合使用,才能保护土壤的地力,发挥其增产的作用。 绿肥是重要的有机肥料之一,它能改善土壤结构,提高土壤把力,为农作物提供多种有效养分。据报导,每0.5公斤氮素紫云英鲜草能使早稻增产稻谷6～8公斤,对以后晚稻还可增产稻谷0.5～1公斤。因此,它最直接 In modern agricultural production, long-term excessive use of inorganic nitrogen fertilizer will destroy the soil structure and cause soil compaction. Only with the combination of organic nitrogen fertilizer and inorganic nitrogen fertilizer can we protect the soil fertility and increase its yield. Green manure is one of the important organic fertilizers, it can improve the soil structure, improve the soil to force, provide a variety of effective nutrients for crops. It has been reported that every 0.5kg of nitrogen and milkweed can make early rice yield 6-8 kilograms of rice, afterwards it can also increase the yield of rice by 0.5-1 kilogram. Therefore, it is the most direct