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第一报已经证明,在陕西关中石灰性土壤上,影响磷肥肥效的主要因素是土壤有效磷的含量,土壤有效氮在一定的程度上也产生影响;并初步提出了一个根据土壤有效氮磷含量指导施用磷肥的指标。在第二报中,又继而证明施用化学氮肥能在一定程度上提高磷肥肥效,而施用有机肥料则会降低磷肥效果,而且化学氮肥和有机肥料对磷肥肥效的影响也与土壤有效氮磷含量有关。 本文是在前两报的基础上,用统计学的方法整理出了一个模拟的公式,从量的方面表达了施磷肥的效果与这些因素之间的关系。 这一公式是:
The first newspaper has proved that in Shaanxi Guanzhong calcareous soil, the main factor affecting fertilizer efficiency is the content of soil available phosphorus, soil available nitrogen to a certain extent also have an impact; and initially proposed according to an effective soil nitrogen and phosphorus content Guide the application of phosphate fertilizer indicators. In the second paper, it was proved that the application of chemical nitrogen fertilizers can improve the fertilizer efficiency to a certain extent, while the application of organic fertilizers will reduce the effect of phosphate fertilizers, and the effects of chemical nitrogen fertilizers and organic fertilizers on the fertilizer efficiencies are also related to the soil available nitrogen and phosphorus contents . Based on the former two papers, this article uses statistical methods to formulate a simulation formula, and expresses the relationship between the effect of phosphate fertilizer and these factors in terms of quantity. This formula is: