我省大部分低产田是土瘦肥缺,豆科绿肥种不好,易旱易涝,一年一季不保收。各地改造低产田的实践证明:在整理排灌系统的基础上,增施磷肥,种好绿肥,以磷增氮,以氮增粮,是行之有效的改造低产田的重要技术措施。但是磷肥施用的效果,与土壤、作物和每年气候条件的不同而有差异,同时磷在土壤中的固定、转化又易受土壤水、热条件的影响,也 Most of the low-yielding fields in our province are emaciated lack of fat, legumes green manure is not good, easy to drought and floods, not guaranteed a year. The practice of rebuilding low-yielding fields in various places has proved that it is an important technical measure to effectively rebuild low-yielding fields on the basis of sorting out the irrigation and drainage systems by adding phosphate fertilizer and good green manure to increase nitrogen and nitrogen by nitrogen. However, the effects of P application vary with the soil, crop and annual climatic conditions, and at the same time, the fixation and conversion of phosphorus in the soil are easily affected by soil water and heat conditions,