生产实践与科学研究充分证明,磷肥在石灰性土壤上有着明显的增产效果。但其利用率远较氮肥为低。磷肥利用率低的原因,主要在于土壤对磷的固定作用。要提高磷肥的利用率,充分发挥磷肥的增产效益,必须弄清磷的固定作用。石灰性土壤具有显著的固磷作用,这是一般所公认的。但是,关于它的固定基质问题,至今尚未取得完全一致的看法。通常认为,石灰性土壤中影 Production practice and scientific research have fully proved that phosphate fertilizer in calcareous soil has obvious yield-increasing effect. But its utilization rate is far lower than nitrogen fertilizer. The reason for the low utilization rate of phosphate fertilizer lies mainly in the fixation effect of phosphorus on soil. To improve the utilization of phosphate fertilizer, phosphate fertilizer to give full play to increase production efficiency, we must understand the role of phosphorus fixation. Calcareous soil has a significant phosphorus fixation, which is generally recognized. However, no exact agreement has been reached on the issue of its fixed matrix. It is generally believed that calcareous soil is shadowy