在农业生产中,人們都知道氮、磷、鉀三种元素是农作物生长所必需的“三要素”,其中又以氮素为最重要。可是,氮素在土壤中却偏偏又是最为缺乏的,以致成为限制农作物产量提高的主要原因,因此,提高土壤氮素肥力就成为农业科学中的一个重要任务。提高土壤氮素肥力有許多途徑,如施用有机肥料和化学肥料 In agricultural production, people all know that the three elements of nitrogen, phosphorus, and potassium are the “three elements” necessary for the growth of crops, among which nitrogen is the most important. However, nitrogen is the most deficient in the soil, which has become the main reason to limit the increase of crop yields. Therefore, increasing soil nitrogen fertility has become an important task in agricultural science. There are many ways to increase the fertility of soil nitrogen, such as the application of organic fertilizers and chemical fertilizers.