How to identify and prevent calcium deficiency in cabbage

When the symptoms of plant calcium deficiency, the growth and development of cabbage leaf is blocked, the leaves slightly inward, and then die, commonly known as "leaf burning edge" "dry heart". The individual leaves inside the leaf ball are dry, yellow, and the leaf flesh is dry paper, and the commodity value is obviously reduced.

The reason is that the calcium content in the soil is less; the second is due to excessive application of nitrogen fertilizer, insufficient irrigation or poor water quality, the cation concentration in the soil solution is too high, reverse osmosis occurs, and the absorption of calcium is inhibited, thereby forming calcium deficiency. . The third is caused by calcium deficiency in the interior of the plant's bulb.

Control method: 100-150 kg of slaked lime per acre before the land preparation, and the soil is turned into the soil along with the fertilizer. It is also possible to spray 3% of superphosphate solution (should be added with adhesive) 2 to 3 times before and after the onset of the disease. For calcium deficiency caused by drought, water should be watered and the water quality should be good to ensure that the soil moisture reaches 70%. Apply more organic fertilizer, less inorganic fertilizer, enhance soil water retention, and use organic fertilizer to topdress. When topdressing, do not use single or excessive nitrogen fertilizer. It is necessary to combine watering and appropriate application of phosphorus and potassium fertilizer to prevent dry heartburn. occur.

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