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生产头践和试验指出,氮磷化肥配合施用是提高氮磷化肥肥效的有效途径。但长期连续施用磷肥,其增产效果如何,以及磷在土壤中的消长情况怎样,是一个尚待探索的问题。本所存省农科院作物所土肥室的统一安排下;从1979年早稻开始,进行了等氮条件下不同施磷水平的定位试验,连续三年,共种植六季作物(早、晚稻各三季),现将试验结果初报如下。
Production practices and tests pointed out that with the application of nitrogen and phosphorus fertilizer is to improve the efficiency of nitrogen and phosphorus fertilizer an effective way. However, long-term continuous application of phosphate fertilizer, its yield-increasing effect, as well as phosphorus growth and decline in the soil what kind of situation is an issue to be explored. Under the unified arrangement of soil-fertilizer rooms in the Institute of Crop Sciences, Institute of Agricultural Sciences, Hunan Province, the location of different application levels of phosphorus under different nitrogen conditions has been studied since early rice in 1979. Three consecutive years of planting six seasons of crops ), The first test results are reported below.