长期定位施肥对作物产量及土壤有效养分的影响

通过对棕壤土有机肥和化肥长期定位施肥的研究表明，长期施肥对作物产量和土壤耕层中的有效养分有显著性影响（P〈0．05）。与试验前土壤相比，施用有机肥能显著增加作物产量和土壤中的养分含量；当有机肥和无机肥配合施用时，其促进作用明显大于单施化肥。单施化肥能够提高作物的产量和土壤的有效养分，但增加幅度不大。经过27年施肥，不同处理的作物产量和土壤中的有效养分有一定程度的变化，随着年份的延伸，作物产量和土壤中的有效养分的含量有一定程度的增加，各处理之间无明显差异。

Effect of Long Term Fertilization on the Crops Output and the Soil Available Nutrient

Effect of long term fertilization on the crops output and the soil available nutrient were investigated.The results showed that long term fertilization had significant effect(P<0.05) on the crops output and the soil available nutrient.Compared with the soil of the experiment started,applying organic manure can increase the crops output and the soil available nutrient significantly.When applying the mixture of inorganic fertilizers and organic manure,the improvement effect was much better than applying single inorganic fertilizers.Applying fertilizers can enhance the crops output and the soil available nutrient,but the extent of increasing was not large.Over the 27 years of fertilization,the crops output and the soil available nutrient had increased to a certain extent.And with the year extending,there was a significant increasing year extending,but the difference between treatments was not significant.