玉米氮、磷、钾肥最佳施用量探讨

Optimum Application of N, P and K Fertilizers in Maize

运用“34 14”试验设计 ,探讨黔西南州中上等肥力旱地玉米氮、磷、钾肥料的最佳配比。试验结果表明 :667m2施尿素 2 6kg、普钙 37.5 kg、氯化钾 2 0 kg,玉米单产最高达 618.4 kg;经济施肥 667m2施尿素 13kg、普钙 37.5 kg、氯化钾 6.7kg,肥效好 ,单产为 5 65 .6kg。建立了肥料效应函数方程 y=4 38.79+40 .86N+43.2 5 P+13.35 K+0 .2 4 NP+2 .4 5 NK- 3.39PK- 2 .2 3N2 - 1.5 3P2 - 1.2 1K2。

The '3414' regression design was adopted to study the optimum ratio of N, P and K fertilizers on maize in upland soil with high and medium fertility. The optimum application of three fertilizers was urea 390 kg/ha+calcium superphosphate 562.5 kg/ha+potassium chloride 300 kg/ha. Which gave the highest yield of maize, i.e. 9276 kg/ha, the economic application of three fertilizers was urea 195 kg/ha+calcium superphosphate 562.5 kg/ha+potassium chloride 100.5 kg/ha, which gave higher yield of maize, i.e. 8484 kg/ha. The regression equation was y=438.79+40.86 N+43.25P+13.35K+0.24NP+2.45NK-3.39PK-2.23N 2-1.53P 2-1.21K 2.