In the early stage of tomato calcium deficiency, the edge of the heart leaves yellow and shrinks, and when it is severe, the heart leaves die. The leaves in the middle of the plant formed large dark brown patches, after which the whole plant leaves rolled and lost green, showing a pale yellow color. There are water-stained light yellow-brown to dark green-brown lesions on the umbilicus of the fruit, and the surface is uneven, and the tissue of the disease is necrotic (ie, umbilical rot). During the period of fruit enlargement and maturity, if the supply of calcium is insufficient, cracking will occur, and the fruit will be poorly colored, forming green back fruit, tendon fruit, and brown fruit.
Prevention. Leaf surface sprayed with 0.3% to 0.5% calcium nitrate aqueous solution to supplement tomato calcium. Generally, it is sprayed once every 7 to 10 days, and sprayed continuously for 2 to 3 times. Generally, calcium is added during the expansion and ripening of the tomato fruit. In addition, the use of super-calcium phosphate or calcium magnesium phosphate fertilizer as the base fertilizer, 80-100 kg per mu, can significantly increase the calcium content of the soil, adding the manure and manure of human and poultry manure and biological fertilizer, can make the soil The active calcium content is obviously improved, which is beneficial to the absorption and utilization of tomato roots and avoids calcium deficiency during tomato growth and development. If the tomato is grown in acid soil, when planting tomato in the whole land, apply 50-60 kg of slaked lime powder per acre to neutralize the acidity of the soil, increase the calcium content of the soil, and spray the fruit and vegetables in the tomato growth period. Ling can activate plant ecological growth positive energy, broaden plant conduit path, enhance plant water absorption and fertilizer absorption, and improve fruit yield and quality.
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