The dry heart of Chinese cabbage is also referred to as "skin and rotten". There is no abnormal appearance, but the internal ball is degenerate and cannot be eaten. Consumers suffer large losses.
The cause of the disease Under normal circumstances, the body of cabbage contains more than 80 parts per million of calcium, but due to root dysfunction or other reasons, calcium can not be transported to the growing tip of the leaf, causing physiological disorders. A serious lack of active manganese in the soil can also be caused.
Symptoms are often seen in rosettes, with dry edges on the heart, inward curling, and growth inhibition. At the beginning of the ball, the edges of the leaves were immersed in water, and they turned yellow and translucent until they were yellow and brown and scorch. There was no abnormal appearance after nodulation. Cross-section of the middle of the middle 3-4 layers of the upper part of the bulb was dark brown water stained paper. The leaves of this disease are rotted, with acid rancidity, short shortening stems and vascular bundles normal, which can be distinguished from soft rot and other diseases.
Onset conditions Saline-alkali land, pouring industrial wastewater, applying ammonium sulfate, excessive ammonium carbonate, or uneven rooting caused by application, long time of seedling emergence, soil water shortage, etc. are all easy to cause dry heartburn.
Prevention methods (1) Organic fertilizer should be applied evenly after full fermentation, and chemical fertilizers should be top-dressed in batches; (2) The sorghum should be broadcast live, the water should be poured, and the surface should be kept wet; (3) The dry-scorching heart should be immediately watered. Spray a mixture of 0.7% calcium oxide and 2000 times naphthalene acetic acid; or 1% superphosphate solution, or 0.7 manganese sulfate solution, once every 5-7 days for a total of 3 times. (4) It is strictly prohibited to water industrial sewage.
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