淮北黄潮土长期轮作的磷肥合理施用

Rational Application of P Fertilizer in Long term Rotation Cropping in Yellow Chao Soil in Huaibei

以淮北黄潮土 1 8年的肥料定位试验结果为依据 ,在研究长期轮作条件下磷肥的施用与作物产量、磷肥迭加效应、有机肥配合、土壤的磷素平衡以及速效磷变化趋势等关系的基础上 ,对磷肥在小麦—玉米轮作中的合理施用 (分配 )进行了论述 ;并通过对磷肥的肥效与土壤速效磷含量之间的相关性分析 ,提出淮北黄潮土小麦不需施用磷肥而能获得最高产量的 99%的土壤速效磷最低界限值 K。应用磷肥指数法 ,即可根据土壤速效磷的测定值 ,计算出磷肥的建议施用量。

Rational application of P fertilizer in long term rotation cropping were studied according to the results from the located experiment on yellow chao soil in Huaibei for 18 years.The results showed:On yellow chao soil,more attentions should be paid to balance fertilization at a main of P fertilizer and application of P fertilizer in combination with organic fertilizer.The cumulative effect of P fertilizer for long term application should be considered.The principle of distribution of “regard autumn as superior to summer” should be grasped for application of P fertilizer in winter wheat summer corn rotation system.The requirement of P fertilizer could be determined by the method of P index.