The prevention and control measures of dried cabbage heart disease in Chinese cabbage
After the Chinese cabbage was dried, it lost its commodity value and caused large economic losses to the agricultural production. Generally, the field disease rate was 10% to 20%, and in severe cases, it was as high as 50%, which greatly dampened the production enthusiasm of vegetable farmers. In order to effectively prevent and control the occurrence of the disease and reduce losses, it is necessary to accurately determine the cause of the disease, carefully investigate the hazards of field diseases, carefully analyze the law of occurrence of the disease, whether any one of the production management and management links is improperly performed, or because of lack of soil. Some kind of minerals cause diseases, and the corresponding management measures are formulated after the cause is discovered. The dry Chinese cabbage heart is a physiological disease. The symptoms of the field include: the edges of the leaves on the top of the cabbage leaves are reeled outwards, the leaves are dry and yellow, and the leaves inside the cabbage ball are dried and yellow and lose their commercial value. Causes of the disease are roughly the following: First, due to the lack of soluble calcium in the soil, resulting in malnutrition. The second reason is that the lack of active manganese in the soil affects the absorption of calcium. Third, due to unbalanced watering, unreasonable fertilization, and unbalanced plant physiological functions, calcium nutrition cannot be transferred to the growing tip. In order to reduce the occurrence of dry heart disease in Chinese cabbage and improve the yield and quality of Chinese cabbage, in addition to the selection of disease-resistant varieties, reasonable rotation, and appropriate sowing, the following measures should also be taken:
First, pay attention to the choice of gargle. When planting Chinese cabbage, try to avoid continuous cropping with cabbages, tomatoes, and other crops that require large amounts of calcium.
Second, the water supply during the growth period of Chinese cabbage should be even. After irrigating, timely cultivating tillage should be done to prevent soil compaction and improve soil pellet structure. Avoid flood irrigation, so as not to affect the roots in the field affected by breathing, inhibit root absorption of calcium nutrition.
Third: scientific and rational fertilization. Basal fertilizer is dominated by organic fertilizers, supplemented by chemical fertilizers. Each mu of farmyard manure 2500 kg, 50 kg of superphosphate, 15 kg of potassium sulfate, increase soil organic matter content, improve the soil. Acidic soil should be increased lime, adjust soil pH, nitrogen, phosphorus, potash fertilizer should be reasonable follow-up, according to the nutritional characteristics of different crops, according to the proportion of use.
Fourth: timely calcium supplement nutrition, calcium fertilizer can be sprayed on the foliage, promote the growth of Chinese cabbage, improve quality, control the occurrence of Chinese cabbage dry heart. During the rosette period of Chinese cabbage, spray 350 times calcium chloride solution and 50 ppm naphthylacetate mixture solution or 1% solution of superphosphate 50 kg every 7-10 days.
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