Prevention and cure of dried Chinese cabbage heart
Chinese cabbage dry heart is a kind of physiological disease with high incidence in production. It mostly occurs in vegetable plots with heavy cropping, drought, and excessive application of ammonium sulfate fertilizer. Heavy hydrazine, drought, and large-scale application of ammonium sulfate can all lead to the lack of water-soluble calcium in the soil, lower manganese content, and ultimately to the occurrence of heartburn.
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First, the onset of symptoms. The dry heart of Chinese cabbage is more common in the rosette period. The symptoms are obvious after the ball is weighed, and it reaches the most serious degree during storage. After the onset, the top edge of the leaf ball rolled outwards. The leaf margin gradually fades and becomes yellow. With the expansion of the lesion, the upper part of the leaf blade gradually becomes dry and yellow, showing a dry paper form, and the diseased leaf and the robust leaf are clearly distinguished. The diseased leaves were mainly concentrated in the middle of the leaf ball, and most of the leaves of severe diseased plants were yellowed, which seriously affected the quality of Chinese cabbage.
Second, control methods
1. Avoid heavy crops: Choose Chinese cabbage without planting cruciferous vegetables within 2-3 years.
2. Scientific fertilization: fertilization should be based on basal fertilizer, supplemented by topdressing, organic fertilizer added, and chemical fertilizer applied in appropriate amounts. Avoid over-application of nitrogen fertilizer, especially ammonium sulfate and nitrogen fertilizer should be reduced. Appropriately increase the application amount of phosphorus and potassium fertilizer, promote the balanced absorption of various nutrients by Chinese cabbage, and increase the ability to prevent disease and disease. During the growth period, water supply is ensured and the water-soluble manganese content in the soil is increased. Especially in the seedling stage and the rosette stage, timely watering ensures that the soil is moist and prevents drought. In addition, at the seedling stage and rosette stage, 0.7% manganese sulfate solution was used for foliar dressing, each time 50 liters per acre, for a total of 2-3 times to meet the needs of Chinese cabbage for manganese.