不同施肥对砂土有机质积累的影响

Effect of Different Fertilizer Application on Accumulation of Organic Matter on Sandy Soil

利用长期定位试验，对粗砂潮土有机质含量进行研究的结果表明：在粗砂潮土上单施化学氮肥可导致土壤有机质含量下降，下降幅度随单施氮量的增加而增大；单施磷肥对提高作物产量意义不大，但不会使土壤有机质含量明显下降；氦磷配施可使土壤有机质逐年有所积累；氮磷与有机肥配施不仅能大幅度提高作物产量，而且可使土壤有机质含量有明显增加；增施有机肥对砂质潮土有机质的提高具有重要意义。

The effect of different fertilizer application on soil organic matter was studied in Kaifeng sandy soil by a longterm leeation pit experiment.The result indicated that or-ganic matter content was greatly decreased as the N-single application increasing and P-ingle application neither improve the crop yield nor decrease the organic matter, BOth N,P combined application and N,P combined with organic fertilizer application increased the organic matter content in sool. It was important for sandy soil to improve the fertility by combined application with N,P and organic fertilizer.