在兰州市进行了春小麦新品种陇春31号播期和播种密度试验。结果表明，随着播种日期的推迟，陇春31号的籽粒产量逐渐降低，其适宜的播期为3月8日左右；随着播种密度的增加，陇春31号的籽粒产量均呈现先增加后降低的趋势，适宜的播种密度为645万粒/hm2左右。

The split plot experiment design is conducted to investigate the relationship of the sowing date and sowing density along with the yield of Longchun 31. The result indicates that the yield of Longchun 31 decreased gradually along with the delay of sowing date，the suitable sowing date is on March 8th； and the yield of Longchun 31 increased first then decreased along with the sowing density increased，the suitable sowing density of Longchun 31 is 6 million 450 thousand grain/hm2.

S512.1

甘肃省农业生物技术研究与应用开发项目(GNSW-2014-15)；甘肃省农业科学院科技创新工程学科团队(2014GAAS06；2015GAAS02)