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本试验研究了春、夏棉的干物质积累过程，对Ｎ、Ｐ、Ｋ的需肥规律及各器官中Ｎ、Ｐ、Ｋ的含量。同时根据棉花需肥规律研究了适宜的钾肥用量及钾肥对经济性状的影响。
The experiment studied the dry matter accumulation process of spring and summer cotton, the rule of N, P, K fertilizer requirement and the contents of N, P and K in different organs. At the same time, the suitable amount of potash fertilizer and the effect of potash fertilizer on economic traits were studied according to the rule of cotton demand.