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关中石灰性土壤上磷肥构肥效问题,解放以来就引起了人们的极大重视。大量的试验和生产实践证明:在缺磷地块施用磷肥对多种作物均有明显的增产效果。施用磷肥已是生产上一项重要的增产措施。但是,在一定的气候、土壤、作物和耕作栽培条件下,土壤速效磷的含量是影响磷肥肥效的一个很重要的因素,它们之间呈负相关关系。土壤速效磷是作物磷素营养的直接给源,与作物产量一般是正相关关系。
Guanzhong limestone soil fertilizer fertilizer efficiency problems, since liberation has aroused great attention. A large number of experiments and production practices have proved that the application of phosphate fertilizer on phosphate-deficient land has obvious effects on increasing yield of many crops. The application of phosphate fertilizer is an important production increase in production. However, under certain climatic, soil, crop and tillage cultivation conditions, the content of available P in soil is a very important factor affecting the fertilizer efficiency, and there is a negative correlation between them. Soil available phosphorus is a direct source of crop phosphorus nutrition, and crop yield is generally positive correlation.