从 8 0年代末开始 ,鲁西南、鲁西等地在大白菜制种时普遍采用露地越冬制种方法 (即半成株采种法 )。此法与原来采用的小株采种法相比 ,其优点主要表现为种株生长健壮 ,产量较高 ,成熟期早及节省工料等。特点是省工省力 ,成熟期提前 ,能尽快占领大白菜种子市场 ,深受产种户和经? From the late 1980s, the method of winter-fielding in the open field was widely used in the production of Chinese cabbage in the areas of southwest and Luxi. This method compared with the original small seed collection method, the main advantages of its performance for the sturdy growth of plants, higher yield, early maturity and save materials and so on. Characteristics are labor-saving labor, maturity in advance, as soon as possible to seize the Chinese cabbage seed market, by the production households and by?