Chinese cabbage "Dry Heart" is a common physiological disease in Chinese cabbage production. Most of them appear in the inner leaves of the cabbage filling period, which reduces the commercial quality of Chinese cabbage. Therefore, targeted management measures are taken to find and solve problems in time. This problem can significantly improve the quality of Chinese cabbage and increase the income of vegetable farmers.

First, the symptoms Symptoms Cabbage "Dry Heart" generally in the late growth of Chinese cabbage disease, the incidence of rosette period and the ball stage is frequent, outside the normal leaf growth, cut open the leaf ball can see part of the heart leaves white, Yellowing and dryness, the leaves are dry paper, and the diseased and healthy tissues are clearly distinguished. In severe cases, the entire dish loses its food value.

Second, prevention and control methods 1 Select anti-"dry heart" variety. Such as Taiyuan Erqing, blue leaves, and other varieties. 2 select plots. The Chinese cabbage field should choose lands with loose soil and good drainage. Try not to choose low-lying saline-alkali land. 3 increase organic fertilizer, improve soil properties. Generally, 5000 kg of cooked circumfertility is applied to 667 square meters of plots. The soil is required to be flat and watered uniformly. The salt content of the soil is less than 0.2%. The water quality is not polluted, and the chloride content is less than 500 mg/L. Acid soil should be used. Increase lime and adjust the pH of the soil. 4 focus on nitrogen, phosphorus, potassium balanced water and fertilizer. Strictly control the application of a single nitrogen fertilizer. In soils with medium and medium fertility, the N, P and K fertilizer ratio is 1:0.5:0.5. The amount of urea for every 667 square meters of nitrogen fertilizer is 40 kg, which is applied 2 to 3 times during the rosette stage and ball stage, and the fertilizer should be evenly distributed and watered evenly to prevent overdrying or over-wetting. 5 timely application of calcium fertilizer. Out-of-root calcium supplementation is an effective and direct method. Usually, from the beginning of the Chinese cabbage rosette stage, 0.7% calcium chloride and 50 mg/kg Naphthylacetate mixture are sprayed every 7 to 10 days. Pay attention to the key to the heart when spraying, spraying 4 to 5 times to achieve 80% of the control effect. Can also be used 11% superphosphate, 0.7% manganese sulfate spraying dry heart. 6 Scientific arrangements for mouthwash. When planting Chinese cabbage on a land that is prone to dry-heartburn, it should be avoided in conjunction with vegetable crops such as cabbage and tomatoes where demand for calcium fertilizer is strong. If the tomatoes grown on the palate often have umbilical rot in the result period, it indicates that the plot is seriously deficient in calcium, and it is better not to plant Chinese cabbage in autumn qi.

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