大白菜是我国最重要的蔬菜,在我国北方大部分地区其播种面积占秋播面积的50%以上,占秋冬菜上市量70%左右,既使在长江流域一带的播种面积亦占秋播面积的15-20 %,占其上市量为20—25%,是解决冬淡季的主要品种。但当前大白菜生产中普遍存在的有机肥用量日益减少,大量施用单一氮素 Chinese cabbage is the most important vegetable in our country. In most parts of northern China, the sown area accounts for more than 50% of the autumnal area, accounting for about 70% of the total amount of autumnal and winter vegetable market. Even though sown area in the Yangtze River Basin accounts for autumn sowing area Of the 15-20%, accounting for 20-25% of its listing, is to solve the main varieties of winter off-season. However, the current widespread use of organic fertilizer in Chinese cabbage production is decreasing day by day.