在平凉市采用田间定位试验(3 a)， 探讨了秸秆还田方式对全膜双垄沟播玉米产量和土壤养分的影响。结果表明，全膜双垄沟播结合秸秆还田处理的玉米产量较对照无秸秆还田显著增加，以种植带秸秆翻耕还田处理的玉米产量最高，较对照增加25.25%。秸秆还田各处理0～20 cm耕层土壤总孔隙度较对照增加。秸秆还田3 a后，种植带或非种植带秸秆翻耕还田方式能明显提高土壤有机质含量，改善土壤速效钾和速效磷供应能力，有利于土壤的可持续发展。

The effect of straw returning mode on yield and soil nutrients of ditch sowing corn in double ridge mulched with plastic film is studied in the field experiment in Pingliang city in three years. The result shows that the corn yield of straw returning mode on ditch sowing corn in double ridge mulched with plastic film compared with the control without straw returning to field is significantly increased， The yield of corn straw returning to planting belt is the highest， is 25.25% higher than that of the check. The total porosity of soil treatment of straw returning(0～20 cm) higher than that of the check. After 3 years of straw returning， the soil organic matter content with straw returning mode of planting belt or non-planting could be significantly improved， the increase of the supply capacity of soil available potassium and available phosphorus， and it is good for the sustainable development of soil.

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甘肃省农业科学院院列项目“创新基地土壤肥料长期定位试验科研协作网建设”(2013GAAS112)部分内容