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万全县是一个农业生产大县,农业人口17.33万人,耕地面积44.53万亩。因此,土壤是农业生产中重要的组成部分,土壤养分是作物生长发育必须的营养元素。在作物需要的16种必须营养元素中,除C、H、O来自大气以外,其它都直接或间接来自于土壤。因此,土壤中养分含量直接影响着作物的生长发育和产量,随着科技水平和生产水平的提高,土壤养分含量也在发生着很大的改变。
Wanquan County is a large agricultural production county with an agricultural population of 173,300 and a cultivated area of 445,300 mu. Therefore, soil is an important part of agricultural production. Soil nutrients are necessary nutrients for crop growth and development. Of the 16 essential nutrients required for crops, all come from the soil, directly or indirectly, except C, H, and O come from the atmosphere. Therefore, the soil nutrient content directly affects the crop growth and yield, with the improvement of science and technology and production levels, soil nutrient content is also undergoing a great change.