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本文探讨了皮棉过百斤的条件下,磷肥的增产效果、经济效益和适宜用量等。结果表明,磷肥在一定条件下仍有增产效果,增产幅度大小视土壤磷素营养的丰缺程度而异。但不论土壤有效磷含量多少,磷肥的用量都不是越多越好,而是在一定产量下有一个适量的限度。一般生产条件施用P_2O_516斤左右经济效盆较高,超过此用量,产量随施肥量的增加而递减,产量和施肥量之间呈抛物线关系。
This article explored the lint over a hundred pounds of the conditions, the yield of phosphate fertilizer, economic benefits and appropriate dosage. The results showed that under certain conditions, the phosphate fertilizer still had the effect of increasing yield, and the magnitude of the increase rate varied with the degree of abundance and deficiency of soil phosphorus nutrition. However, regardless of the amount of available phosphorus in the soil, the amount of phosphate fertilizer is not as good as possible, but at a certain yield, there is an appropriate limit. The average production efficiency of P_2O_516 kg was higher in general production conditions. Exceeding this amount, the yield decreased with the increase of fertilizer application rate, and the yield and the amount of fertilizer were parabolic.