First, the symptoms of the disease
The disease mainly occurs in the rosette stage and the ball stage. In the rosette period, the edges of the new leaves are dry, and the inward curling growth is inhibited, which is not easy to cover. In the early stage of the ball, the edge of the tip of the leaf is water-soaked, translucent, and then pale yellow to yellow brown, and the leaves are shrunk into a white dry band. In the late stage of the ball, the appearance is normal. After cutting, the leaf edge is dry and the leaf ball can still grow, but the ball is not tight, and some are rotted by bacterial infection.
Second, the cause of the disease
In the past, more studies have suggested that the disease is caused by the lack of water-soluble calcium in the soil and malnutrition. The current report is considered to be caused by the lack of effective manganese. Therefore, the serious lack of soluble manganese in the soil is the main cause of dry burning of Chinese cabbage in calcareous soil.
Third, the prevention and treatment method
1. Rational application of nitrogen, application of boron and zinc fertilizer and phosphorus and potassium fertilizer. In the rosette stage and the ball-forming stage, the toppings are combined with watering. Apply 3 kg of nitrogen fertilizer per acre (6.5 kg of urea), 1-2 kg of boron-zinc fertilizer, and spray 0.2% potassium dihydrogen phosphate 1-2 times during the rosette and ball-forming period.
2. Spray calcium and manganese fertilizer and naphthalene acetic acid. Found dry heartburn, immediately watered, and spray 0.7% calcium chloride and 50 mg / kg of neva acetic acid mixture, or 1% superphosphate solution or 0.7% manganese sulfate solution, 50 liters per acre of water, increase production 8 %—10%.
3. Ensure the water supply during the rose period and the ball stage. The lack of water in the soil is likely to cause dry heartburn, and it is necessary to water in time for drought and water shortage during the conjoined and ball-forming period. It is strictly forbidden to water industrial wastewater.
4, storage of Chinese cabbage should be maintained at 0 ° C, humidity 90% -95%, to reduce the occurrence of dry heartburn.
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