采用饱和D最优设计，在白银沿黄灌区试验分析了播期与密度对冬小麦产量的影响。结果表明，随着播期的推迟，小麦产量降低；在一定范围内，通过增加密度可以提高小麦成穗数，进而达到提高产量的目的。小麦产量在6 300 kg/hm2以上时，95%的置信区间播期为-0.855 9～0.054 7，密度为-0.275 4～0.672 8，相应的播期在9月17日至9月29日、密度为231.52～338.19 kg/hm2时增产效果为佳。

The effects of sowing date and density on winter wheat yield were analyzed by saturated D optimal design in Baiyin Irrigation Area Along Yellow River. The results showed that wheat yield decreased with the delay of sowing date. In a certain range， the number of panicles can be increased by increasing the density， and then the yield can be increased. When wheat yield was above 6 300 kg/hm2， the sowing date of 95% confidence interval was -0.855 9~0.054 7， and the density was -0.275 4~0.672 8. The corresponding sowing date was September 17 solstice on September 29， and the density was 231.52~338.19 kg/hm2， which yield increase effect was best.

S512.1

甘肃省现代农业科技支撑体系区域创新中心重点科技项目(2020GAAS04)；白银市科技计划项目(2016-2-26N)。