In summer, due to the high temperature and improper management, it is easy to cause summer cabbage to be unconcerned. In this way, the yield and benefits are reduced. For this reason, corresponding countermeasures should be taken for different reasons.
First, distinguish the reasons. The cause of summer cabbage is not overwhelming, mostly due to the following reasons: First, excessive use of nitrogen fertilizer, some vegetable farmers are biased towards applying quick-acting nitrogen fertilizer, but not paying attention to the application of phosphorus and potassium fertilizer, resulting in insufficient phosphorus and potassium fertilizer, so that cabbage is not included. The heart or the heart is loose. Second, the water supply is uneven. In summer, due to the high temperature, Chinese cabbage grows rapidly and requires a large amount of water. If it cannot be timely and evenly watered, it is easy to cause Chinese cabbage to be unconcerned. Third, the rain is heavy and the humidity is high. In summer, due to frequent rainfall, the humidity in the cabbage field is large, which affects the growth of Chinese cabbage, and it is also easy to produce Chinese cabbage. Fourth, improper control of pests and diseases, summer pests and diseases of Chinese cabbage are more serious, especially soft rot, dry heart disease, downy mildew, powdery mildew, viral diseases, mites, cabbage caterpillars, etc., the occurrence of these pests and diseases to a certain extent The growth of cabbage causes the cabbage to be unintentional.
Second, the response measures.
　　 1. Rational fertilization. In the cabbage cabbage period, it is necessary to increase the application of phosphorus and potassium fertilizers and organic fertilizers, and control the 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 - 15 kg per acre , with watering.
　　 2 , scientific watering. In cabbage knot bag of the ball, the water must be kept uniform, adequate supply, avoid uneven, to prevent dry when wet, and is appropriate to keep the soil moist, can morning and evening water pouring 1, noon not remember Watering. At the same time, the weeds should be covered with weeds, and the thickness of the grass should be 3 - 5 cm to reduce moisture loss and keep the soil moist.
　　 3. Control pests and diseases in a timely manner. During packet heart cabbage Chinese cabbage, leaf to be noted that regular checks, found downy mildew, soft rot when damage, to the initial fosetyl aluminum wettable powder with 40% in the pathogenesis of 200 - 300 times, 50% Swiss toxicity MnZn 500--600 tuck fold, or 50% copper metalaxyl WP 600--800 times, 7--8 spray days 1, 2 continuous control --3 times.
　　 4. Spray foliar fertilizer in time. Chinese cabbage package of ball every 7--10 days 1 800-fold foliar spray vegetable Dedicated KOMIX active humic acid organic liquid fertilizer, or 0.3% of the urea was mixed with 0.3% potassium dihydrogen phosphate Liquid, even spray 2 - 3 times, evenly spray the leaves, can effectively promote the cabbage heart.
　　 5 , set the shade net. After planting Xiafuyu cabbage in the greenhouse, a silver-gray or black shade net is placed on the front slope of the shed, which can significantly reduce the temperature inside the shed, which is conducive to the cabbage's heart.
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