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甘蓝型油菜是常异花授粉作物,虽然自交结实率很高,但还有10～30％的异交率。当前油菜生产中,品种又多、又乱、又杂,既有甘蓝型,又有白菜型,既有常规品种,又有杂交品种,由于隔离条件差,很难提纯选优,故一个优良品种,种上二、三年就混杂退化了。为解决油菜生产品种的退化问题,笔者1991年做了如下试验。3月初,当油菜(KW-33)现蕾初花时,选择生长健壮,无病虫害、性状典型一致
Brassica napus is often cross-pollination crops, although the rate of selfing seed set is high, but there are 10 to 30% of the outcrossing rate. The current rapeseed production, the variety and more chaos, and miscellaneous, both the cabbage type, there are cabbage type, both conventional varieties, there are hybrid varieties, due to poor isolation conditions, it is difficult purification purification, so a good variety , Planted on two or three years mixed deterioration. In order to solve the degradation of rapeseed varieties, the author made the following experiment in 1991. In early March, when the rape (KW-33) was in early blossoming, it was selected to grow robustly without pests and diseases and the traits were typical.