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桔秆还田是改善土壤有机质状况,培肥地力的一项重要措施,从七十年代初期各农场普遍推广应用,有效地改善了土壤有机质缺乏,理化性状不良的状况,在生产上取得了良好的效果。但目前在实行秸秆还田措施上尚存在一些问题 1.实行秸秆还田后土壤碳、氮比失调的问题土壤微生物的活动与土壤中碳氮比关系极为密切。碳素是微生物生命活动的能量来源,氮素是微生物躯体的主要结构物质(体蛋白质)。微生物每合成十份躯体物质大约需要五十份有机养料,其中约含碳素25份、氮素1份。而禾本科作物秸秆残体的C/N比,麦秸、稻草约为60～70∶1,玉米茎叶约为60∶1,各种蒿秆约为65～85∶1。而土壤适宜微生物活动的
Returning straw to straw is an important measure to improve the status of soil organic matter and fertility. Since the early 1970s, various farms have been widely used to improve soil organic matter deficiencies and poor physical and chemical properties, and have achieved good results in production Effect. However, there are still some problems in practicing the measures of returning straw to soil. 1. The problem of imbalanced soil carbon and nitrogen ratio after applying straw to soil. The relationship between soil microbial activity and soil carbon and nitrogen ratio is very close. Carbon is the energy source of microbial life activities, and nitrogen is the main structural substance (somatic protein) of the body of microorganisms. Approximately fifty organic nutrients are required for the microbial synthesis of ten body soils, including about 25 parts of carbon and 1 part of nitrogen. The C / N ratio of straw residues in gramineous crops is about 60-70: 1 for wheat straw and straw, about 60: 1 for stems and leaves of corn, and 65-85: 1 for all kinds of artesunate. The soil suitable for microbial activity