In autumn, the ground temperature gradually declines, the roots of vegetables are severely aged, and the absorption of nutrients is hindered. In late autumn, the vegetables are in a period of prosperous growth and are prone to calcium deficiency. Should arouse the attention of vegetable farmers. The calcium absorbed by vegetables plays a variety of roles in the plant body. It can promote the development of cell walls, reduce the extravasation of nutrients in plants, inhibit the infection of pathogens, improve disease resistance, eliminate the damage of organic acids in the body, and promote the body Various metabolic processes. 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. Calcium deficiency generally occurs in the soil itself; calcium deficiency; high soil salinity, inhibition of root absorption of water and nutrients; soil drought, making the soil solution concentration, reducing the root water absorption, thereby inhibiting the absorption of calcium; excessive application of ammonium nitrogen It will inhibit the absorption of calcium, and the incidence of dry heart disease in Chinese cabbage will increase with the increase in the amount of nitrogen fertilizer. Control measures to control the amount of fertilizer, should not be too much with a fertilizer, especially with chlorinated fertilizers such as ammonium chloride and potassium chloride; timely irrigation, to prevent soil drought; to spray calcium, calcium chloride and calcium nitrate can be used As spray fertilizer, the concentration of 0.3% ~ 0.5%, usually sprayed once every 7 days or so, even spray 2 ~ 3 times can be effective. Tomato should be sprayed on the upper and lower leaves of inflorescence 2~3 when flowering. Chinese cabbage sprays calcium when it begins to enter the ball stage. Adding auxin substances such as naphthalene acetic acid when spraying calcium can promote calcium absorption. Concrete formula: 0.7% calcium chloride plus naphthalene acetic acid 50ppm, spraying after mixing; applying calcareous fertilizer (such as gypsum, superphosphate, calcium magnesium phosphate fertilizer), calcareous soil generally do not need to use calcium fertilizer alone, usually when applying phosphate fertilizer Has brought calcium.
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