主要栽培因子对甘蓝型油菜各枝序角果含油量的影响

为了研究不同播种期、密度、氮肥对油菜各枝序含油量的影响，同时研究油菜不同枝序不同层次含油量的变化规律，以甘蓝型油菜品种‘华油杂9号’为材料进行系统试验。结果表明：随着氮肥增加，各枝序含油量均显著降低，平均增加纯氮15 kg/hm2，各枝序含油量降低0.54%~0.98%；第4个播期的各枝序含油量明显低于前3个播期，即晚播（11月1号以后播种）不利于油分的积累；不同密度下各枝序含油量变化规律并不十分明显。主枝含油量要大于各分枝含油量，各分枝含油量从上至下呈先升后降的趋势；主枝从下至上含油量呈先上升后下降的趋势，在主枝角果较多的情况下顶层部分的含油量要稍高于下层部分的含油量，主枝角果越多，含油量变异幅度越大，最大变异达到3.68%。

Effect of Cultivation Factors on Oil Content of Different Branches in Rapeseed

Rapeseed （Brassica napus L.） cultivar ＇ Huayouza 9＇ was used to study the changes of oil content in different branches on different sowing dates, density and N application, and also studied the changes of oil content in different layers on different branches. The results showed that, oil content of different branches reduced as the N application increasing, oil content of seed dropped 0.54%-0.98% per kilo nitrogen. Oil content of different branches on sowing date 4 was fewer than sowing date 1-3, it explained that, sowing date delayed, made oil content reduced. There was no discipline about three densities of oil content in different branches. Oil content of principal branch was more than the other branches, oil content of middle branches was more than upper and bottom branches, and the upper were greater than the bottom. Oil content of middle part of rachis was the highest, upper part was higher than the bottom of rachis. The more pod number of rachis, the more variation of oil content, the maximum variation was about 3.68%.