一、引言经济有效地施用化学肥料是农业化学重要的任务之一,考虑到我国有着广大面积的酸性土壤,这些土壤一方面极为缺磷,另一方面由于它的强大的固定磷素的能力,在施用磷肥后又往往不易发挥其最大的效用,因此在这些土壤中寻求经济有效的磷肥施用方法,就成为当前的重要问题之一。我国农民在经济用肥方面有着极为丰富的经验,如“沾秧根”、“安灰兜”等,这些方法 I. INTRODUCTION Economical and effective application of chemical fertilizers is one of the important tasks of agrochemical. Considering that our country has a vast area of ​​acid soil, these soils are extremely deficient in phosphorus. On the other hand, due to its strong capability of fixing phosphorus, After the application of phosphate fertilizer is often not easy to play its maximum effectiveness, so in these soil to find a cost-effective method of application of phosphate fertilizer has become one of the important issues. Our peasants have a wealth of experience in economic use of fertilizers, such as “polluting roots”, “gray pocket” and so on, these methods