Tomato deficiency calcium prevention and treatment

Symptoms of calcium deficiency in tomatoes: Atrophy of plants, necrosis at the top growth point, small shoots, and yellowing. The young leaves around the growing point turned brown and some of them died. The umbilicus turns black and forms umbilical rot.

Prevention and control measures: Rational fertilization, in addition to full use of organic fertilizer as a base fertilizer, but also need to use 20-25 kg / mu superphosphate or calcium magnesium phosphate as a base fertilizer to prevent soil calcium deficiency. For soil diagnosis, if there is calcium deficiency, it is necessary to supply calcium fertilizer. A 0.3%-0.5% calcium chloride aqueous solution should be sprayed on the leaves in time and sprayed 2-3 times per week. In order to prevent fruit umbilical rot, cracking, deformity, etc., in the young fruit period, the fruit expansion phase of the foliage is sprayed with dragon light Jiashi 1500 times liquid 2-3 times.

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