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施用氮肥和磷肥的肥效反应值,随着土壤全氮量和土壤有效磷的增加,而各自减少。根据在这两种营养元素肥力不同土壤上的施肥反应值,对这些土壤氮、磷肥力分级作了尝试。
Fertilization response values of applying nitrogen fertilizer and phosphate fertilizer decreased with the increase of soil total nitrogen and soil available phosphorus. According to the fertilization response values of the two fertilizers, the fertility of nitrogen and phosphorus in these soils were tested.