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 excessive organic acids in the body, and promote the body. Various metabolic processes. Once the vegetables are deficient in calcium and the metabolism in the body is blocked, various calcium deficiency symptoms such as tomato umbilical rot and Chinese cabbage dry heart disease will occur.
The general symptoms of calcium deficiency in vegetables are the germination of the new parts of the plant such as the apical bud, the root hair, the atrophy and death, the new leaves sticking, the new leaves are often focal, and the incompleteness is incomplete; the top of the fruit is prone to depression, dark brown and necrotic.
Calcium deficiency is generally caused by calcium deficiency in the soil itself; soil salt content is high, inhibiting roots to absorb water and nutrients; soil drought, increasing soil solution concentration, reducing root water absorption, thereby inhibiting calcium absorption; excessive application of ammonium nitrogen It will inhibit calcium absorption, and the incidence of dry heart disease in Chinese cabbage will increase with the increase of nitrogen fertilizer application.
Control measures should control the amount of fertilizer, it is not appropriate to use too much fertilizer at one time, especially with chlorinated fertilizers such as ammonium chloride and potassium chloride; timely irrigation to prevent soil drought; to foliar calcium, calcium chloride and calcium nitrate can be used As a spray fertilizer, the concentration is 0.3%~0.5%, generally sprayed once every 7 days, and even sprayed 2~3 times. Tomatoes should be sprayed on the 2~3 leaves above and below the flowering inflorescence. Chinese cabbage is sprayed with calcium when it begins to enter the ball-forming stage. In addition, when calcium is sprayed, the addition of auxin substances such as naphthaleneacetic acid can promote the absorption of calcium.
The specific method of calcium chloride 0.7% plus naphthalene acetic acid 50ppm, sprayed after mixing; application of calcareous fertilizer (such as gypsum, superphosphate, calcium magnesium phosphate), calcareous soil generally do not have to apply calcium fertilizer alone, usually when applying phosphate fertilizer Has brought in calcium.
Author: Hou and chrysanthemum
Source: Farmers Daily
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