Li Junfa A: Xia cabbage does not care, the reasons are mainly 4 points: First, the use of nitrogen fertilizer is too much. Partial application of quick-acting nitrogen fertilizer, but not the application of phosphorus and potassium fertilizer, resulting in insufficient phosphorus and potassium fertilizer, making cabbage unconstrained or loose; second, uneven water supply. The summer temperature is high, the Chinese cabbage grows rapidly, and the water demand is large. If it can't be watered in time, it is easy to cause the cabbage to be unconcerned; the third is the rain and the humidity. Frequent rainfall in summer makes the humidity of Chinese cabbage field larger, affecting the growth of Chinese cabbage, and it is also easy to produce Chinese cabbage. Fourth, improper control of pests and diseases. In summer, the diseases and insect pests of Chinese cabbage are more serious, especially soft rot, downy mildew, powdery mildew, aphids, cabbage caterpillars, etc. The occurrence of these pests and diseases affects the growth of Chinese cabbage to a certain extent, which causes the Chinese cabbage to be unconcerned.
Summer cabbage is not in the heart and needs comprehensive prevention and control:
First, it is necessary to fertilize rationally: in the period of cabbage cabbage, it is necessary to pay attention to the application of phosphorus and potassium fertilizers and organic fertilizers, and control nitrogen fertilizer to inhibit its madness. Generally, in the early stage of the ball and in the middle of the ball, a ternary compound fertilizer should be applied once, each time 10 to 15 kg per acre, with watering.
Second, we must scientifically water the water: in the cabbage cabbage period, we must maintain a uniform and sufficient supply of water, avoid it for a long time, in case of dryness when wet, and to keep the soil moist, it can be early and late. Pour a clear water, remember to not water at noon.
Third, we must promptly control pests and diseases: during the cabbage cabbage ball-binding, we must pay attention to the regular inspection of the leaves, and when there are damages such as downy mildew and soft rot, 40% ethyl phosphorus aluminum wettable powder should be used in the early stage of the disease. ~300 times liquid, 50% toxic manganese zinc 500-600 times liquid, or 50% nail cream copper wettable powder 600-800 times liquid, 7-8 days spray once, continuous control 2 to 3 times.
Fourth, it is necessary to spray foliar fertilizer in time: in the cabbage heart period, every 7 to 10 days, the leaf surface can be sprayed 800 times vegetable-specific organic humic acid active liquid fertilizer, or 0.3% urea and 0.3. The mixture of % potassium dihydrogen phosphate is sprayed 2 to 3 times to evenly spray the leaves, which can effectively promote the cabbage of the cabbage.
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