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大白菜是我国北方秋菜主要的菜种之一,播种面积大,产量高,食用时间长,但由于三大病害的危害及管理不当,往往产量不高不稳。为达到高产稳产的目的,根据一些高产典型和生产实践的经验应采取以下几点技术措施: 一、选用良种、缩短播种时间,使播种期为防病安全播种期一般菜区安全播种期为立秋前2～5天,播种早易受3大病害危害,播种晚虽病害有所减轻但产量也逐渐下降。但是如果8月上旬为多雨年份,预兆是病害不发生年、可早播1～2天。如采用大连农科所育成的“早秋一号”中熟种可晚播1～2
Chinese cabbage is one of the main vegetable species of autumnal Chinese cabbage in northern China. Its sown area is large, its output is high and it takes a long time to eat. However, due to the hazards and improper management of the three major diseases, the yield is not high and unstable. In order to achieve the purpose of high and stable yield, the following technical measures should be taken according to the experience of some high-yield typical and production practices: I. Selection of elite to shorten the sowing time so that sowing time is preventative and disease-resistant. The first 2 to 5 days, sowing susceptible to the three major diseases early damage, sowing although the disease has been reduced but the yield also declined. However, if early August is a rainy year, the harbinger of the disease does not occur in years, early broadcast 1 to 2 days. Such as the use of Dalian Institute of Bred “early autumn” in the late sowing of late 1 to 2