In the course of planting, Chinese cabbage sometimes suffers from the symptoms of focal edge and skin damage. What kind of illness is this? In fact, it is the disease of dry Chinese cabbage. In recent years, the incidence of this disease has been increasing year by year, which has seriously affected the yield and quality of Chinese cabbage. Chinese cabbage is in the period from the rosette to the Baoxin stage, which is the key period for preventing and curing Chinese cabbage dry heart. At this time, the majority of vegetable growers should pay close attention to prevention and treatment. Symptoms The disease mainly occurs in the rosette stage and ball stage. During the rosette period, the edges of the new leaves are dry and the inward curling growth is inhibited. The early sensation of senescence, the edge of the leaf blade was immersed in water, translucent, pale yellow to yellowish brown, and the leaf shrinked into a white dry zone. After the onset of the ball, the appearance was normal. After the cut, the leaves were seen to have coke and the leaves could still grow. However, the ball was not tight, and some were rotted due to bacterial infestation. Causes In the past, more studies suggested that the disease was caused by lack of water-soluble calcium in the soil and malnutrition. Existing reports suggest that it is caused by the lack of effective manganese. Therefore, a serious lack of soluble manganese in the soil is the main cause of dry heartburn in Chinese cabbage. Control methods 1. Reasonably apply nitrogen, increase boron and zinc fertilizers and phosphorus and potassium fertilizers. In the rosette stage, the ball stage combined with watering each fertilizer once. Each application of 3 kg of nitrogen fertilizer (6.5 kg of urea), 1 to 2 kg of boron and zinc fertilizers, and spraying of 0.2% potassium dihydrogen phosphate 1 to 2 times during the rosette and ball stage. 2. Spray calcium manganese fertilizer and naphthalene acetic acid. The dry heart was found to be immediately watered and sprayed with a mixture of 0.7% calcium chloride and 50 mg/kg of nicosic acid, or a 1% solution of superphosphate or a 0.7% solution of manganese sulfate, at a rate of 50 liters of water per acre. %~10%. 3. Guarantee the water supply in the rosette and ball stage. The lack of water in the soil is likely to cause dry heartburn. Water shortages during the period of nesting and the ball-breaking period must be promptly watered. It is forbidden to pour industrial waste water. Fingerprint Tripod Turnstile,Full Height Turnstile,Automatic Flap Swing Tripod Turnstile,Full Height Swing Tripod Turnstile Chongqing Huifan Technology Co., Ltd , https://www.hfsecuritytech.com