大白菜对播期要求严格,播种过早会引起多种病害的连续发生,播种过晚产量和食用价值均不高。为此,确定大白菜适宜播期是获得稳产高产的关键。大白菜确切播期只有3—4天。确定其确切播期,先要根据当地适宜大白菜生长的季节(即下种时气温在24—25℃,并逐渐递减到包心成熟时的5℃),确定生长期长短的大型或中、小型品种,然后再依据所用品种的生长天数,以当地降雪日期往前推算而定。如运城市常 Chinese cabbage on the strict requirements of sowing, sowing too early will cause a variety of diseases in a row, sown too late production and edible value are not high. To this end, to determine the appropriate sowing cabbage is the key to stable and high yield. The exact sowing of cabbage is only 3-4 days. Determine the exact date of sowing, first according to the local season for the growth of Chinese cabbage (that is, when the next species of temperature at 24-25 ℃, and gradually decreased to 5 ℃ when mature heart) to determine the length of the growing season of large or medium, Small breeds and then based on the number of days of growth of the breed, depending on the date of the local snowfall. Such as Yuncheng city often