在缺磷的土壤上,磷肥有着明显的增产作用。通过广泛试验,已经找到了大面积磷肥有效的地区,但是磷肥的生产远远不能满足需要。所以,一方面要广泛地开辟磷肥来源,生产更多磷肥。另一方面,要充分发挥现有磷肥的作用,达到既经济又有效的目的。这二个 In phosphorus-poor soil, phosphate fertilizer has a significant increase in yield. Through a wide range of experiments, we have found a large area of ​​phosphate fertilizer effective, but the production of phosphate fertilizer is far from meeting the needs. Therefore, on the one hand, we should extensively open up phosphate fertilizer sources and produce more phosphate fertilizer. On the other hand, it is necessary to give full play to the role of existing phosphate fertilizer so as to achieve both economic and effective purposes. These two