在临夏高寒阴湿区膜侧沟播种植条件下，研究了保苗密度对春油菜产量及性状的影响。结果表明:临夏高寒阴湿区膜侧沟播春油菜适宜的保苗范围为25.5万～30.0万株/hm2，最佳密度25.5万株/hm2，其产量为3 939.0 kg/hm2，较低保苗密度(21.0万株/hm2)、高保苗密度(39.0万株/hm2)分别增产13.29%和17.81%，产量差异达显著水平，且能有效地降低株高和分枝高度，促进油菜壮苗，延缓油菜菌核病的发病时间和降低发病率，提高抗倒伏能力。

The field experiments under furrow sowing on side of film mulch were conducted to investigate the effect of the seeding denstity effects on product and characters of spring rape in the high altitude wet-shady dnd arid mountain regions of Linxia . The reasults showed that the suitable range of conserving seeding was 255 000-300 000 plants/hm2， the suitable density was 255 000 plants/hm2， the prodution was 3 939.0 kg/hm2， and 13.29%， 17.81% higher than of the check that the low seeding density(210 000 plants/hm2) and the high seeding density(390 000 plants/hm2) on furrow sowing on side of film mulch for spring rape in the high altitude wet-shady and arid mountain regions of Linxia， the yield was significant level . Furthermore， the technology could decrease plant height， stronging rape seeding， delaying the onset time of sclerotia sclerotium， reducing the incidence， increasing resisting lodge .

S565.4

甘肃省农业科学院农业科技创新专项(2010GAAS24)部分内容