Soil organic matter, soil porosity, availible N, Zn, Fe, Mn and enzyme are all positively related to the amount of straw applied remarkably, while soil specific weight is negatively correlative.

土壤有机质、孔隙度、速效氮、锌、铁、锰、酶活性等理化指标与秸秆还田量呈显著正相关；

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The results showed that maize straw returning field combined low amount N did not promote the accumulation of organic carbon significantly, as compared with NPK treatment.

结果表明：与NPK处理比较，玉米秸秆还田配施低量N肥没有显著促进黑土有机碳的积累。

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Total-N was declined with different speed during the exhausted stage. Farm manure, chemical fertilizer and straw had different sustainable effects.

进入耗竭阶段后，土壤全氮又不同程度的下降，只是不同处理变化速度不同而已。

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