Chinese cabbage dry heart is a physiological disease, mainly caused by calcium deficiency. In the rosette period and the heart disease period, the affected leaves are mostly in the middle of the leaf ball, and often there is a diseased leaf in several layers of normal leaves. The typical symptoms are the normal growth of the outer leaves. After peeling off the bulbs, some of the leaves can be seen to turn white, yellow, and dry from the leaf margins, and the leaves are dry paper-like. Prevention of dried cabbage heart can take the following measures.

Balanced fertilization basal fertilizer mainly organic fertilizer, supplemented by chemical fertilizers. The per acre Shiren farmyard fertilizer 4000 ~ 5000 kilograms, superphosphate 50 kilograms, potassium sulfate 15 kilograms, increase soil organic matter content, improve soil structure, promote plant robust growth. At the same time, we must choose lands with loose soil and well-drained land for planting, and try not to choose low-lying saline-alkali land. Acidic soil should be increased lime, adjust the soil pH.

Rational watering Chinese cabbage during the growth of the water supply should be balanced, timely watering drought, irrigation with small water, so that the soil does not dry up, irrigating soil in time after the cultivator to prevent soil compaction. Can not flood irrigation, so as not to damage the roots of the field by the rake. During the rosette period, we must pay special attention to the changes in soil moisture, and when there are heavy rains, we should promptly drain the earth.

Supplemental calcium fertilizer foliar spray calcium can effectively prevent the occurrence of Chinese cabbage dry heart. Usually from the beginning of the Chinese cabbage rosette period, every 7 to 10 days, spray 0.7% calcium chloride and 50 mg/L naphthyl acetate solution or 1% superphosphate calcium solution 30 kg into the heart and leaves, spray 3~5 times.

Manganese supplements are sprayed with 0.1% potassium permanganate solution or 0.1% manganese sulfate solution for 30 days in the rosette period. Once in 7 days, they can be sprayed 2 or 3 times. They can also be sprayed with calcium.

With Sakaguchi, Chinese cabbage should be avoided in conjunction with crops such as cabbage and tomatoes that absorb large quantities of calcium, and can be planted with potatoes, garlic, and Green onions.

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