Autumn vegetables supplement calcium and less chlorinated fertilizer

In autumn, the ground temperature gradually declines, the roots of vegetables are aging, and the absorption of nutrients is blocked, while the delayed vegetables in autumn are in a period of vigorous growth, and it is easy to lack calcium. At this time, calcium should be replenished, and no more chlorinated fertilizer should be applied.

The calcium absorbed by vegetables plays a variety of roles in the body of plants. 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 top 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 easily sunken and dark brown and necrotic.

Calcium deficiency occurs, generally the soil itself is deficient in calcium; soil salt content is high, inhibiting roots to absorb water and nutrients; soil drought, which increases soil solution concentration, reduces root water absorption, thereby inhibiting calcium absorption; Application will inhibit calcium absorption, and the incidence of dry heart disease in Chinese cabbage will increase with the increase of nitrogen fertilizer application.

The main control method is to control the amount of fertilizer. It is not advisable to use too much fertilizer at one time, especially for chlorinated fertilizers such as ammonium chloride and potassium chloride; it is necessary to irrigate in time to prevent soil drought; at the same time, foliar application of calcium fertilizer, calcium nitrate may be used. As a spray fertilizer, the concentration is 0.3% to 0.5%, and it is usually sprayed once every 7 days, and even sprayed 2 to 3 times. Tomatoes should be sprayed on the 2 to 3 leaves above and below the flowering inflorescence, and the Chinese cabbage will be sprayed with calcium at the beginning of the ball-forming period.

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