Autumn vegetables need to prevent calcium deficiency
In autumn, the ground temperature gradually declines, the roots of vegetables gradually age, 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. The calcium absorbed by vegetables plays a variety of roles in the plant body. Once calcium is deprived, metabolism in the body is hindered, and various calcium deficiency diseases can occur, such as tomato umbilical rot and cabbage dry heart disease. Symptoms of calcium deficiency in vegetables are generally manifested in newly emerged parts of the plant, such as apical buds, root hairs, fertility, atrophy, dead leaves, new leaf adhesions, unfolding new leaves often with coke edges, incomplete incompleteness; the top of the fruit is easily sunken, showing dark brown spots, and then necrosis. .
Calcium deficiency occurs generally in the soil itself, calcium deficiency; soil salt content is high, inhibiting the roots to absorb water and nutrients; soil drought, making the soil solution concentration increased, root water absorption decreased, thereby inhibiting the absorption of calcium; excessive application of ammonium nitrogen fertilizer 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.
In terms of prevention and control methods, it is mainly to control the amount of fertilizer, and it is not appropriate to use too much fertilizer at a time, especially with chlorinated fertilizers such as ammonium chloride and potassium chloride; timely irrigation to prevent soil drought; at the same time, foliar spray of calcium fertilizer can be Use 0.3% ~ 0.5% calcium nitrate spray, spray usually every 7 days or so, and even spray 2 to 3 times can be effective. Tomato should be sprayed on the upper and lower inflorescence of 2 to 3 leaves. Chinese cabbage is sprayed with calcium fertilizer at the beginning of the ball stage.
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