By measuring wheat yield, quality and soil nutrients, microbial activity, microorganism quantity in fields with different years of organic management, study was conducted on effect of organic management on soil quality and wheat production in downstream area of the Shiyang River. The results show that continuous organic management can greatly improve the content soil organic matter, rapidly-available phosphorus and rapidly - available potassium, enhance soil alkaline phosphalase activity, and increase significantly the quantity of soil bacteria and actinomycetes. Compared with that with traditional management, the farmland with three years of organic management has higher content of soil organic matter, available nitrogen, available phosphorus and available potassium, which are increased respectively by 49.70%, 28.63%, 190.08% and 122.89%. Three-year consecutive organic management increases the grain protein content by 20.98 % , lysine content by 41.86 % , and yield by 7.25 % . The organic management improves soil fertility and stability of wheat yield, and enhances significantly nutritional quality.%通过测定不同年限有机管理田小麦产量、品质和土壤养分、酶活性及微生物数量,研究有机管理对石羊河下游土壤质量和小麦生产的影响.结果发现,连续实施有机管理可以显著提高土壤有机质、速效磷、速效钾含量,提高土壤碱性磷酸酶活性,显著增加土壤细菌、放线菌数量,三年有机管理农田土壤有机质、碱解氮、速效磷、速效钾含量相比传统管理农田分别提高了49.70％、28.63％、190.08％、122.89％;连续三年有机管理使小麦籽粒蛋白质含量增加了20.98％、赖氨酸含量提高了41.86％,产量提高了7.25％.可见,在民勤绿洲区实施有机管理有利于提高土壤肥力,能稳定小麦产量,并显著提高营养品质.
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