Tomatoes are deficient in calcium, and many physiological diseases such as umbilical rot, cracked fruit and poor coloration will occur. In order to ensure the normal growth and smooth flowering of tomato, prolong the flowering result period, high yield and excellent quality, calcium fertilizer should be applied in time.
First, the symptoms
Calcium-deficient tomatoes usually have short, thin plants and drooping leaves. In the early stage of calcium deficiency, the edge of the heart leaves yellow and shrinks, and in severe cases, 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, which will make the fruit lose its luster.
Second, 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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