Calcium-deficient tomatoes usually have short, thin plants and drooping leaves. 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 ripening, if the supply of calcium is insufficient, cracking will occur, resulting in poor coloration and tarnishing of the fruit.
Second, preventive measures
Foliar spraying 0.3%-0.5% calcium nitrate aqueous solution, or 0.1%-0.2% calcium chloride aqueous solution, or 400-500 times active calcium aqueous solution, or 600-800 times fluid calcium aqueous solution, or 800-1000 times polymeric calcium aqueous solution, Or 600-800 times of chelated calcium aqueous solution, or 800-1000 times of calcium alkoxide aqueous solution, or 500-600 times of amino acid calcium aqueous solution, etc., is an effective method for tomato calcium supplementation. Generally, it is sprayed once every 7 to 10 days, and sprayed continuously for 2 to 3 times, which has a good calcium supplement effect. The best time for calcium supplementation is during tomato fruit enlargement and maturity.
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 ensure that there is sufficient calcium to supply the growth and development of the tomato. need.
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