【摘要】 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。更多还原

【Abstract】 Huayouza 9 and huashuang 5 were used to study the effect of sowing date and plant density on direct seeding rapeseed traits and yield components.The results showed that variety,sowing date and interaction of sowing time and density significantly affected yield.The yield of Huayouza 9 was larger than huashuang 5,mainly due to the increase of effective pods per plant.Early sowing was conducive to individual growth of direct-seeding rape before winter;the number of branches per plant,effective pod number per plant,seed number per pod and 1 000 grain weight all increased.The optimum sowing density differed according to differennt sowing time.Low density could help inspiring yield increasing potential under early sowing conditions;while high sowing density was suitable for late sowing time.更多还原