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冬油菜的生长发育盛期主要在冬前和春后。冬前以营养生长为主，需１００ｄ左右，占油菜全生育期的一半；春后逐渐转为以生殖生长为主，也需１００ｄ左右。陇东白菜型油菜要获得高产，应在冬前努力促进营养生长，争取最大的生长量、分化较多的叶片数，并切实抓好冬季防冻保...
Winter rape growth and development of the main pre-winter and spring. Before winter, vegetative growth mainly takes about 100 days, accounting for about half of the whole growth period of rape. After spring, it gradually changes to reproductive growth and takes about 100 days. Longdong cabbage-type rapeseed to get high yield, should strive to promote vegetative growth before winter, for the maximum growth, differentiation of more leaves, and earnestly grasp the winter frost protection ...