论文部分内容阅读
通过对唐山市丰润区耕地土壤养分的调查,结果表明,与1982年土壤普查结果相比,有机质、全氮、有效磷、速效钾含量均呈上升趋势,上升幅度为2.22%～511.76%。在此基础上,分析了土壤养分含量变化的原因,提出了调控措施。
The results showed that the contents of organic matter, total nitrogen, available phosphorus and available potassium in the soil were increased from 2.22% to 511.76% compared with the results of the 1982 Census. On this basis, the reasons for the changes of soil nutrient content were analyzed and the control measures were put forward.