Abstract:

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%.