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在赤壁市利用“3414”试验设计布置中稻氮、磷、钾肥料效应试验。结果表明,中稻施用氮肥的效果最好,稻谷增产量最高达2 325 kg.hm-2,相应增产率为39.1%,纯增收入2 737.5元·hm-2;施用钾肥的增产量为777 kg·hm-2,增产率为10.4%,纯增收入678.5元.hm-2;施用磷肥的增产量为400 kg·hm-2,增产率为5.1%,纯增收入288.8元·hm-2。通过拟合三元二次和一元二次肥效模型,确定中稻N、P2O5和K2O的最高产量施用量分别为169.8、84.5和163.7 kg·hm-2,最佳经济施用量分别为153.7、61.5和120.8 kg.hm-2。
Applying “3414” experimental design to the experiment of effect of nitrogen, phosphorus and potassium on medium rice in Chibi city. The results showed that the middle-rice was the best nitrogen application, rice yield up to 2 325 kg.hm-2, the corresponding yield was 39.1%, the net income of 2 737.5 yuan · hm-2; the application of potassium increased yield of 777 kg · Hm-2, yield increase was 10.4%, net income was 678.5 yuan · hm-2; yield of phosphate fertilizer was 400 kg · hm-2, yield was 5.1%, net income was 288.8 yuan · hm-2. Through fitting quadratic and quadratic fertilization models, the highest yield of N, P2O5 and K2O was determined as 169.8, 84.5 and 163.7 kg · hm-2, respectively, and the best economic application rates were 153.7 and 61.5 120.8 kg.hm-2.