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以油菜(Brassica napus L.)华油杂9号和华双5号为试验材料,研究了播种期和密度对直播油菜单株性状及产量构成的影响。结果表明,品种、播种期及播种期与密度互作对产量的影响达极显著水平。华油杂9号比华双5号增产,主要原因是单株有效角果数增多;早播有利于直播油菜冬前个体生长,单株分枝数、单株有效角果数、每角粒数和千粒重均有所增加;而不同播种期所要求的最适密度不同,早播条件下低密度更能发挥增产潜力,迟播条件下增加播种密度、加大群体的增产效应更加明显。
The effects of sowing date and density on the characters and yield components of direct seeding rape (Brassica napus L.) were studied. The results showed that the effects of variety, sowing date and planting density on the yield were significant. The main reason for the increase in the number of effective pods per plant is the increase in the number of pods per plant, the number of branches per plant, the number of effective pods per plant, Number and 1000-grain weight increased. However, the optimum density required for different sowing dates was different. The low density under early sowing conditions could give more potential for yield increase. The sowing density was increased under delayed sowing conditions, and the effect of increasing yield was more obvious.