通过二次通用组合旋转设计试验，建立了甘谷县旱塬地全膜覆土穴播小麦产量与氮磷钾肥的模型关系，并对数学模型寻优，以期得出不同产量范围下的施肥量。结果表明，3个施肥因子对冬小麦产量影响以施氮量最大，施磷量次之，施钾量最小，其中氮肥因子和磷肥因子对产量影响显著。通过模型寻优得出，当施N 90 kg/hm2、P2O5 22.5 kg/hm2、不施钾肥时，小麦产量最高，可达6 136.55 kg/hm2。即在甘谷县旱塬地进行冬小麦天选50号全膜覆土穴播栽培时，需要中等氮肥、磷肥水平，不施钾肥。

In order to get fertilization rate under different yield range， through the two general combined rotary experimental design， a model relationship of yield and NPK fertilizer of hole sowing in palstic mulched soil wheat of in Gangu county was established， and optimization of the mathematical model . The result shows that the effect of 3 fertilizer factors on winter wheat yield，with amount is the largest， phosphorus amount second place， the potassium amount is the least， which had a significant effect on nitrogen and phosphate fertilizer factor on yield significant factor. Through the model optimization is obtained， when theapplication of N 90 kg/hm2， P2O5 22.5 kg/hm2， wheat yield is the highest， reaches 6 136.55 kg/hm2. That is culture winter wheat Tianxuan 50 need medium nitrogen， phosphate fertilization levels， with no potassium fertilizer， when hole sowing in palstic mulched soil wheat of in dryland in Gangu county.

S512.1；S147.2

甘肃省农业科技成果转化资金计划项目“抗锈高产强筋小麦天选50号示范与推广”(1305NCNE124)部分研究内容