论文部分内容阅读
耕层土壤养分含量的多少,是我们进行合理分配和施用肥料的主要依据。土壤养分是土壤肥力的重要因素之一,作物通过根系从土壤中吸取所需要的养分。但要满足作物生长所需要的养分,却远远不够,这是由于土壤中氮、磷、钾等养分含量不多,并有相当一部分不能被作物所直接吸收利用。因此摸清土壤中养分的状况,是搞好科学施肥的前提。现根据敦化县三千六百多个耕层化验结果,提出因土施肥的几点建议如下:
The amount of nutrient content in topsoil is the main basis for our rational distribution and application of fertilizer. Soil nutrients are one of the most important elements of soil fertility. Crops draw the nutrients they need from the soil through the roots. However, the nutrients needed to meet the needs of crop growth are far from adequate. This is due to the low content of nutrients such as nitrogen, phosphorus and potassium in soils and a considerable portion of them can not be absorbed directly by crops. So to find out the status of nutrients in the soil is a good premise for scientific fertilization. According to Dunhua County, more than 3600 plowing test results, put forward some suggestions for soil fertilization are as follows: