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对6个试验点N、P 和K 肥用量16年连续试验后的P 和K 残留效应进行了研究。经过两年的棉花叶片样品和一年的土壤样品分析,找出施肥与产量的相关。发现各点N 素最好用量为34到135公斤/公顷,施N 对产量的效应达高度显著水平。产量最好处理的叶片含N 量是3.1—4.9%。发现各点施N、叶片N 和产量之间为显著的正相关。只有2个点的土壤对P 的施用产生反应。叶片P 资料指出含P0.3%是适宜的。发现叶片P 与土壤P 和产量相关。有个5点试验表明,在大多数情况下,施K 量、土壤K 值、叶片K 和产量之间的相关都是显著的。产量最好小区的叶片含K 量是0.9—1.57%。本文还报道了384个样品的叶片N、P、K、Ca、Mg、Fe、B、Zn和Al 的平均含量。
The P and K residual effects after sixteen consecutive years of N, P and K fertilizer application at six test sites were studied. After two years of cotton leaf samples and one year of soil sample analysis, find out the correlation between fertilization and yield. It was found that the optimum amount of N at each point was 34 to 135 kg / ha, and the effect of N application on yield was highly significant. The best N leaf yield was 3.1-4.9%. It was found that there was a significant positive correlation between N application rate and N yield and yield. Only 2 points of soil responded to the application of P. Leaf P data that contains P0.3% is appropriate. Leaf P was found to correlate with soil P and yield. A 5-point trial showed that in most cases, the correlation between application K, soil K, leaf K and yield was significant. The best yield plot leaf K content is 0.9-1.57%. The average content of N, P, K, Ca, Mg, Fe, B, Zn and Al in 384 samples was also reported.