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1隔离区选择大白菜属十字花科芸薹属常异交作物,容易串花,要求严格的隔离条件。制种田开阔地间隔2000米以内不能有不同品种的大白菜、小白菜、黑油菜、瓢儿菜、
1 isolation area selection Chinese cabbage is cruciferous Brassica often outcrop crops, easy flowering, demanding strict isolation conditions. The system of open fields within 2000 meters intervals can not have different varieties of Chinese cabbage, Chinese cabbage, black rape, scoop children dishes,