为探索胡麻产量和植株性状对种植密度的响应规律，筛选适宜白银市灌区胡麻的种植密度。以陇亚13号为供试品种，研究不同种植密度(600万、750万、900万、1 050万、1 200万粒/hm2)对胡麻产量和植株性状的影响。结果表明，随着种植密度的增加，胡麻产量、株高、工艺长度、单株生物量、单株粒重、每果粒数和经济系数呈先增后降的趋势，分茎数、分枝数、分枝长、果层厚度、单株果数和千粒重逐渐降低，主茎贡献率增加，分茎贡献率逐渐降低。在白银市灌区现阶段生产水平下，胡麻种植密度为750万粒/hm2时，产量水平最高，为2 299.68 kg/hm2。

In order to explore the response of the flax yield and plant traits to planting density, so as to screen the suitable planting density of flax in Baiyin irrigation district, Longya 13 flax was used as the test material. Field experiments were conducted to study the effects of different planting densities(6.0 million, 7.5 million, 9.0 million, 10.5 million, 12.0 million grains/ha) on flax yield and plant traits. The results showed that with the increase of planting density, the yield, plant height, process length, biomass, seed weight per plant, seed number per fruit and economic coefficient were increased first and then decreased, whereas the number of stems, branches, branch length, fruit layer thickness, fruit number per plant and thousand grain weight were decreased gradually. Moreover, the contribution rate of main stem was increased gradually, while that of branch stem was decreased gradually with the increase of planting density. When the planting density was 7.5 million grains/ha, the highest yield was 2 299.68 kg/ha at the current level of flax production in Baiyin irrigation areas.

S565.9

国家现代农业产业技术体系(CARS-14)；甘肃省第二批陇原青年英才项目。