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一、播种前期(立秋前):1.及早腾茬,并深翻整平,使土壤经充分曝晒和休闲,促进养分分解和消灭土中潜伏的病虫害源。2.实行轮作。大白菜与十字花科作物连作,不但会造成土壤中某些元素的缺乏,且能使病原菌越积越多,故应轮作。3.重施底肥,增施磷钾肥。亩产5000公斤白菜需吸收氦素16公斤,五氧化二磷6公斤,氧化钾11公斤。因此,翻地前要施人腐熟的有机肥料5000公斤,过磷酸钙25—40公斤,以促壮株和提高抗病力。4.选用抗病良种。可选用北京小杂56号、丰抗70、鲁白6号、83—24等品种。
First, the pre-planting (before the autumn): 1. Tengcui earlier and deep plowing leveling, so that the soil after full exposure and leisure, and promote nutrient decomposition and elimination of latent pests in the soil. The implementation of rotation. Chinese cabbage and cruciferous crop continuous cropping will not only result in the lack of certain elements in the soil, and make the accumulation of more pathogens, it should be rotation. 3. Heavy basal fertilizer, increased phosphorus and potassium fertilizer. 5000 kg cabbage per mu required to absorb 16 kg of helium, phosphorus pentoxide 6 kg, potassium oxide 11 kg. Therefore, before turning the ground to apply manure of 5000 kilograms of organic fertilizer, superphosphate 25-40 kilograms, to promote strong strains and improve disease resistance. 4. Use resistant varieties. Optional small Beijing Miscellaneous 56, Feng anti 70, Lu Bai 6, 83-24 and other varieties.