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通过对高肥力土壤肥料效应试验研究,结果表明:在速效钾含量380mg·kg-1的土壤上施用钾肥没有增产效应;速效氮含量126mg·kg-1、速效磷含量16mg·kg-1的高肥土壤上皮棉产量与氮磷化肥用量的效应方程为:Y=1195.6+1.11N+1.96P-0.001534N2-0.007359P2+0.003396NP,由此模拟最佳经济效益施肥为:尿素560.3kg·hm-2,重过磷酸钙为178.8kg·hm-2,最佳经济产量为1792.1kg·hm-2。
The results of fertilizer experiment on high-fertility soils showed that the application of potash fertilizer did not increase the yield of wheat at the available potassium level of 380 mg · kg-1; the available nitrogen was 126 mg · kg-1 and the available phosphorus was 16 mg · kg-1 The effect equation of fertilization on the yield of lint cotton and the amount of nitrogen and phosphorus fertilizers was: Y = 1195.6 + 1.11N + 1.96P-0.001534N2-0.007359P2 + 0.003396NP, so the best economic benefit of fertilization was as follows: urea 560.3kg · hm- 2, SSP was 178.8kg · hm-2, and the best economic yield was 1792.1kg · hm-2.