采用“3414”完全设计试验方案，研究了陇东旱地玉米一膜两季秸秆还田栽培施肥对玉米产量的影响，以探索其优化施肥模式，寻找最高产量时N、P2O5、K2O的最佳施用量及其组合。结果表明，玉米产量预测值与N(X1)、P2O5(X2)、K2O(X3)的施用量三元二次回归方程为:Y=9 420.968+7.699X1+8.738X2+47.622X3-0.002X1X2+0.011X1X3-0.018X2X3-0.014X12-0.014X22-0.582X32。其理论最佳产量对应的施肥量为:N 270.9 kg/hm2、P2O5 276.9 kg/hm2、K2O 39.3 kg/hm2，即最佳施肥量的 N、P、K 配施比例为1∶1∶0.15。

In order to understandthe corn fertilization optimized model under mulching and straw returning with cultivation in dryland， we conducted a two-season cropping experiment using “3414” random block design. The results showed that the ternary quadratic regression equation between prediction yield value and the application rate of N(X1)， P2O5(X2) and K2O(X3) was y=9 420.968+7.699X1+8.738X2+47.622X3-0.002X1X3-0.018X2X3-0.014X12-0.014X22-0.582X32. The optimal application rate of N， P2O5 and K2O was 270.9 g/hm2， 276.9 g/hm2， K2O 39.3 g/hm2， respectively. The optimal ratio of N∶ P2O5∶K2O was 1∶1∶0.15.

S147.2；S513

陇东旱地农作物种质改良及产业化协同创新中心[甘教技(2019)23号]资助。