Calcium-deficient tomatoes usually have short stigma, and the water-stained light yellow-brown to dark green-brown lesions appear in the umbilicus of the fruit. The surface is uneven and the tissue 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 loss of luster. So how should tomatoes be scientifically supplemented with calcium?
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, generally spraying once every 7-10 days, Continuous spraying 2-3 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 superphosphate or calcium magnesium phosphate as the base fertilizer, 80-100 kg per acre, 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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