宁夏银北地区耕地面积占引黄灌区总耕地面积的一半以上,且80%田块种植小麦。磷肥的施用自小区试验到普及推广已有20余年历史,积累大量资料。其有效施用条件与土壤有效磷含量、有机肥施用量、作物种类、施用技术以及地势高低、作物产量水平都有一定关系。从与土壤有效磷含量关系看:1963～1964年灌区栽培及大田共33个试验证 The area of ​​arable land in Yinbei in Ningxia accounts for more than half of the total arable land in the Yellow River irrigated area, and 80% of the land is planted with wheat. The application of phosphate fertilizer has been more than 20 years since the district trial was popularized and popularized, accumulating a large amount of data. The effective application conditions are related to available phosphorous content, organic manure application, crop type, application technique, topography and crop yield. From the relationship with available phosphorus content in soil: From 1963 to 1964, there were 33 test certificates