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种植豆科绿肥,可以增加土壤有机质,改良土壤,固定空气中的氮素。一般每亩豆科绿肥,可以增加氮素十斤至二十五斤,发展六十万亩豆科绿肥,机当于一个年产万吨碳铵的化肥厂。近几年来,信阳地区和通许、南阳、新野、邓县、杞县、商丘、长垣、郑州市等地的不少社队自力更生,发展绿肥,促使粮、棉获得增产。全省绿肥面积已发展到八百多万亩。广大群众创造了许多利用绿肥的好经验,由绿肥单种发展到与粮、棉间作套种;由人少地多地区发展到人多地少地区,用地与养地相结合。如果将全省的夏闲
Planting legume green manure, can increase soil organic matter, soil improvement, fixed nitrogen in the air. General per acre legume green manure, you can increase nitrogen ten pounds to twenty-five pounds, the development of six hundred thousand acres of legume green manure, machine when an annual output of 10,000 tons of ammonium bicarbonate fertilizer plant. In recent years, many communes and communes in Xinyang, Tongyang, Nanyang, Xinye, Dengxian, Qixian, Shangqiu, Changyuan, and Zhengzhou have made their own efforts to develop green manures and promote grain and cotton production. The province’s green manure area has grown to more than eight million mu. The majority of the masses have created many good experiences of using green manures, ranging from monoculture of green manure to intercropping with grain and cotton, and from less man-made land to less man-made land, with a combination of land and raising land. If the province’s summer leisure