Most of the vegetable crops are hi calcium, which can promote the development of vegetable cell walls, reduce nutrient extravasation in the body, inhibit the infection of pathogens, increase the disease resistance of plants, eliminate the harm of excessive organic acids in the body, and promote various metabolic processes. First, the symptoms of calcium deficiency Once the calcium deficiency, the metabolism of the body is blocked, there will be a variety of symptoms of calcium deficiency, such as plant growth buds, hair roots of fertility stagnation, death, atrophy, new leaf adhesions, new leaves are often focal edge, incomplete Incomplete; the top of the fruit is easy to sag, appear black and brown and die. Toxicity of tomato and sweet pepper causes umbilical rot, and the leading edge of the young fruit (the end of petal shedding) has an immersed flesh, and the peel is intact. As the fruit enlarges, the affected part of the fruit shrinks and shrinks and becomes dark brown. Spots are often affected by secondary fungal infections, showing rotten topography. The depression of the top of the sweet pepper was not as pronounced as the tomato, but it was mostly brown withered. Umbilical rot usually occurs when the fruit is close to the size of the thumb, and the fruit of the enlarged period is generally no longer affected. Ca deficiency in Chinese cabbage is prone to heartburn and calcium deficiency in cabbage causes heart rot. Chinese cabbage and kale after the ball, split open the leaf ball, visible edge of the inner leaf or together with the heart and leaves with brown dry. In some cases, the edges of the leaves that have not been added to the ball during the initial period of the ball are browned and browned. Calcium-deficient cabbage and Chinese cabbage have a significant decline in edible rates, and they have an abnormal taste and severely affect quality. The calcium deficiency of broccoli is prone to occur during the development of flower buds. The front and edges of new leaves are yellowed and then browned to death; the development of flower bulbs is hindered and the quality is reduced. The lack of calcium in celery showed that the growth of the apex was obstructed, the new leaves were yellowing, the leaf margin was scorch, and the plants had no fresh sensation. Rooting observed showed less roots, yellowish brown, root branches, and few root hairs. Second, the cause of calcium deficiency Vegetable calcium deficiency occurs mainly due to the following reasons: the soil itself is deficient in calcium; soil salt content is high, inhibiting root absorption of water and nutrients; soil drought, making the soil solution concentration increases, reducing the root water absorption, thus inhibiting Absorption of calcium; excessive application of ammonium nitrogen also inhibits the absorption of calcium, and the incidence of Chinese cabbage heart disease increases with the increase of the amount of nitrogen fertilizer. Third, prevention and control measures to control the amount of fertilizer, can not use too much fertilizer, especially the amount of chlorinated fertilizers such as ammonium chloride and potassium chloride can not be too much; to timely irrigation, to prevent soil drought; foliar spray calcium, optional chlorine Calcium and calcium nitrate, the concentration of 0.3% to 0.5%, generally about once every 7 days spray, and even spray 2 to 3 times can be effective. Tomatoes should spray two or three leaves from the inflorescences during flowering. Chinese cabbage is sprayed when it begins to enter the ball stage. In addition, adding auxin substances such as naphthalene acetic acid during calcium application can promote the absorption of calcium. The specific method is: 0.7% calcium chloride plus naphthalene acetic acid 50 mg/kg, sprayed after mixing. It is also possible to use calcareous fertilizers such as gypsum, superphosphate, calcium magnesium phosphate fertilizer, etc., calcareous soil generally do not have to use calcium fertilizer alone, usually calcium has been brought into the application of phosphate fertilizer.
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