有机肥与无机肥在提高土壤肥力中的作用

以在山东禹城试验区持续近20年的定位试验为依据，对长期施用有机肥、无机肥、有机无机结合等不同施肥条件下的土壤养分演变进行了系统总结。结果表明，在同等施肥情况下，有机肥不但在增加土壤有机营养，改善土壤有机质质量等方面具有极其显著的作用，而且随着年限的增长，在增加土壤速效养分方面，有机肥的效果也逐渐超过无机肥。

Effect of organic manure and chemical fertilizer on soil nutrient

Effects of 20 years continuous long-term application of organic manure,chemical fertilizer and organic-chemical combined fertilizer on the results of soil nutrients variation were studied at Yucheng experiment area of Shandong Province.The experimental results indicated that at equal fertilization condition years after years,fertilizing organic manure not only had markedness fuctions at increasing soil's organic nutritions and improving quality of soil organic matter,but also could increase soil availabale nutrients more than chemical fertilizer.