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多年的农业生产实践证明,秸秆还田有改土培肥增加产量的良好作用。表现在:①土壤微生物数量增加,活性增强。因为秸秆是新鲜的有机物质,为土壤微生物提供生物能源,促进土壤微生物活动,因此微生物数量增加。据黑龙江八一农垦大学测定,用新鲜麦秸还田后每克土中细菌数量由12×10~6个增加到197×10~6个,提高16倍。②促进有机质的更新和养分的转化。据测定,麦秸还田后纤维分解率提高62％,有效磷平均每100克土增加2.16毫克。③提高化学肥料的利用率和化肥的增产效果。据测定,
Years of agricultural production practices have proved that straw returning to soil with fertilizers to increase production of a good effect. In: ① increase in the number of soil microorganisms, activity increased. Because straw is a fresh organic material that provides bioenergy to soil microbes and promotes soil microbial activity, the number of microorganisms increases. According to the determination of Heilongjiang August First Land Reclamation University, the amount of bacteria per gram of soil increased from 12 × 10 ~ 6 to 197 × 10 ~ 6 with fresh wheat straw, increasing by 16 times. ② promote the renewal of organic matter and nutrient conversion. According to the determination, after the straw returned to the field of fiber decomposition rate increased 62%, available phosphorus average per 100 grams of soil increased 2.16 mg. ③ improve the utilization of chemical fertilizers and fertilizer yield. According to the determination,