Techniques for prevention and control of dry heart disease in Chinese cabbage
Cabbage dry heart disease is a common physiological disease in Chinese cabbage production. At the early stage of disease, the top edge of the Chinese cabbage leaf curls outwards, the leaf margins gradually dry and yellow, the lesions expand, the leaf tissue is water stained, and the upper part of the leaves Also gradually dry yellow, leaf dry paper. The diseased leaves were mainly concentrated in the middle of the leaf ball, and most of the leaves of the seriously diseased plants were dry and yellow. The onset of the field began in the rosette period. Some young leaves showed only dry edges, and only after the ball appeared, they showed symptoms. The storage period was severe. Therefore, adopting targeted management measures can improve the quality of Chinese cabbage and increase the income of farmers. 1, choose resistant varieties. 2, scientific and rational fertilization. Increase organic manure, control the amount of nitrogen fertilizer, improve soil properties, and promote robust growth of plants. 3, strengthen fertilizer and water management. The water supply during the growth period of Chinese cabbage should be even. Before sowing, it should be irrigated. The seedlings should be encouraged to be poured by small water. During the rosette period and the ball stage, fertilizer should be top-dressed in stages to avoid concentrated fertilization. After irrigating, timely cultivating loose soil to prevent soil compaction. 4, pay attention to the choice of mouth. When planting Chinese cabbage, try to avoid connecting crops such as cabbage and tomato with high calcium requirements. 5, timely calcium supplementation. The calcium fertilizer can be sprayed on the leaf surface to promote the growth of Chinese cabbage, improve the quality, and control the occurrence of Chinese cabbage dry heart. During the rosette period of Chinese cabbage, sprayed 0.7% calcium chloride and 50ppm naphthylacetate mixture or 1% calcium superphosphate solution 50kg every 7-10 days. Spray 3 to 5 times continuously.
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