Vegetables are cold to calcium
In autumn, the ground temperature gradually decreased, the aging of vegetable roots accelerated, and the absorption of nutrients was hindered. In late autumn, the vegetables were in a period of prosperous growth, and they were prone to calcium deficiency. Once the vegetables are deficient in calcium, metabolism in the body is hindered and various symptoms of calcium deficiency will occur, such as tomato umbilical rot, cabbage dry heart disease and so on.
The general symptoms of calcium deficiency in vegetables are the growth of new parts of the plant, such as apical buds, root hairs, atrophy, death, new leaves adhesion, new leaves are often coke edge, incomplete defects; fruit tops are prone to depression, dark brown and necrosis. In this case, calcium must be promptly added. The measure is to spray calcium into the foliage, and calcium chloride and calcium nitrate can be used as spray fertilizer, with a concentration of 0.3% to 0.5%. Generally, spraying once every 7 days or even spraying 2 to 3 times can be effective. Tomato should be sprayed on the upper and lower leaves of the inflorescence at the time of flowering. The Chinese cabbage should spray calcium when it begins to enter the ball stage. In the calcium spray when adding auxin substances such as naphthalene acetic acid, can promote calcium absorption, available calcium chloride 0.7% plus naphthalene acetic acid 50ppm, spraying after mixing.
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