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莲座期是大白菜生长的关键时期,此时生长速度快,根系和叶片生长旺盛,但也是病害发生的关键时期。在管理上要促叶片快速生长,尽快形成最大的叶片同化面积,促根系快速发育,控后期叶片旺长,防病害发生。1.肥水管理。大白菜莲座期,生长速度和生长量都很快,需肥量增多。莲座初期应追施“发棵”肥,每667平方米施尿素8~10千克,方法是在垄的一侧开10厘米沟,施肥封沟浇水,开沟时注意尽量少伤根。结球期需
The rosette stage is a crucial period for the growth of Chinese cabbage. At this time, the growth rate is fast, the root system and the leaves grow vigorously, but it is also the key period of the disease occurrence. In the management to promote rapid leaf growth, as soon as possible to form the largest leaf assimilate area, and promote rapid root development, leaf length control late, anti-disease occurs. Fertilizer and water management Chinese cabbage rosette stage, growth rate and growth are fast, need to increase the amount of fat. The early rosette should be pursued “Fat tree” fat, urea per 667 square meters 8 to 10 kg, the method is to open a furrow on the side of 10 cm ditch, fertilizer sealing ditch watering, ditch pay attention to minimize the root injury . Need to knot the ball