在河西绿洲灌区，研究了播期和密度对小麦品种陇春33号产量构成因素及产量的影响。结果表明，随播种密度的增大，基本苗株高增高，导致成穗数和收获指数明显下降，穗粒数和千粒重表现为先增加后降低的趋势。随着播期的推迟，产量下降，3月30日以后播种的产量下降显著。不同播期产量变化幅度又因播种密度不同而异，陇春33号产量以播期3月20日、密度675万粒/hm2处理最高，为8 769.6 kg/hm2；其次是播期3月20日、密度750万粒/hm2处理，为8 706.8 kg/hm2；播期3月10日、密度675万粒/hm2处理排第3，为8 505.2 kg/hm2；播期3月20日、密度825万粒/hm2处理排第4，为8 323.9 kg/hm2；播期3月10日、密度750万粒/hm2 处理排第5，为8 118.1 kg/hm2。可见，在河西绿洲灌区陇春33号达到高产优质的适宜播种时间为3月上中旬、播种密度为675万～750万粒/hm2。

The effects of sowing date and density on yield components and yield of wheat variety Longchun 33 were studied in Hexi oasis irrigation area. The results showed that with the increase of sowing density， the basic seedling height increased， leading to a significant decrease in panicle number and harvest index， and the number of grains per panicle and 1000-grain weight showed a trend of first increasing and then decreasing. With the postponement of sowing date， the yield decreased significantly after March 30. The range of yield changes varies with sowing density. The highest yield of Longchun 33 was 8 769.6 kg/hm2 with a density of 6.75 million grains/hm2 on March 20； Second， the yield was 8 706.8 kg/hm2 with a density of 7.50 million grains/hm2 on March 20； Third， the yield was 8 505.2 kg/hm2 with a density of 6.75 million grains/hm2 on March 10； Fourth， the yield was 8 323.9 kg/hm2 with a density of 8.25 million grains/hm2 on March 20； Fifth， the yield was 8118.1 kg/hm2 with a density of 7.50 million grains/hm2 on March 10. It can be seen that the suitable sowing time for Longchun 33 in Hexi Oasis Irrigation District to reach high yield and high quality is in the beginning and middle of March， and the sowing density is 6.75～7.50 million grains/hm2.

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甘肃省科技重大专项“抗逆高产小麦新品种选育及高效生产技术集成展示”(1203NKDF018)。