两年来加拿大西部两个地区对五个甘蓝型油菜的播种期和播种量对其农业性状的影响进行了研究。推迟播种会使植物茎秆和总产量大幅度增加,但要大大减少种子产量、收获指数、植株密度、单株花序数和单位面积的花序数。播期对单株种子产量、千粒重和株高没有重大影响。加大播量会使植株密度和单位面积的花序数显著增加,但会使收获指数、单株花序数、单株种子产量和株高显著下降。播量对种子、茎叶或总产量和千 In two years in western Canada, the effects of sowing time and sowing volume on five agricultural characters of rapeseed were studied. Postponing sowing will result in a substantial increase in plant stalks and total yield but significantly reduce seed yield, harvest index, plant density, number of inflorescences per unit and number of inflorescences per unit area. Sowing date had no significant effect on the seed yield per plant, 1000-grain weight and plant height. Increasing the sowing rate will significantly increase the plant density and the number of inflorescences per unit area, but will significantly reduce the harvest index, the number of inflorescences per plant, the seed yield per plant and the plant height. Sowing on seeds, stems and leaves or total output and thousand