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本文利用~(32)P 示踪法研究了磷肥在山东三类主要土壤中的固定和移动及提高磷肥利用率的方法。证明了固定不是影响磷肥利用率低的主要因素,起主要作用的是磷肥移动距离小,磷肥不能充分达到根际吸收区。因此施用磷肥必须根据作物栽培特点,根系分布状况,适当扩大磷肥与根系的接触面积,这是提高磷肥利用率的有效途径之一。
In this paper, the method of ~ (32) P tracer was used to study the immobilization and movement of phosphate fertilizer in three major soils of Shandong Province and to improve the utilization rate of phosphate fertilizer. It is proved that immobilization is not the main factor affecting the low utilization rate of phosphate fertilizer. The main effect is that the movement distance of phosphate fertilizer is small, and phosphate fertilizer can not reach the rhizosphere absorption area sufficiently. Therefore, the application of phosphate fertilizer must be based on crop cultivation characteristics, root distribution, appropriate to expand the contact area of phosphate fertilizer and root, which is an effective way to improve the utilization of phosphate fertilizer.