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从1989年7月5日至7月30日每隔5d为1个大白菜播期进行了试验,结果表明,播期越早,病毒发病率越高,斑点病发病率有随播期推迟而增加的趋势,生长天数相同时大白菜的生长速度以7月15日播种的为最快,到采收时不同播期的单株产量以7月5日播种的为最高,随着播期的推迟而降低,早播者单株重较高是单叶重增加,大叶百分率较高的缘故。小区产量和折合亩产以7月10日播种的为最高。通过讨论认为,在呼市地区大白菜播期可以进一步提早,如结合苗期浇水,85d生育期的大白菜可提早到7月5日到10日播种,这样可使产量进一步提高。
From July 5, 1989 to July 30, 1989 every 5d for a Chinese cabbage sowing date tests showed that the sowing date, the higher the incidence of the virus, the incidence of spot disease with the sowing date delayed Increased the growth of the same number of days when the growth rate of Chinese cabbage sowed on July 15 the fastest, to harvest the different sowing date of sowing the highest yield on July 5, with the sowing date Postponed and reduced, premature plow higher single plant weight is increased, the greater percentage of large leaves sake. Community yield and yield per mu to sowing on July 10 for the highest. According to the discussion, the sowing date of Chinese cabbage in Hohhot can be further advanced. For example, Chinese cabbage with 85d growing period can be sowed from July 5 to 10 before planting, which can further improve the yield.