When the leaves are sprayed with calcium fertilizer in time, the growth of the tomato fruit requires more calcium, and when the soil is insufficient for calcium, the fruit is susceptible to umbilical rot. Therefore, calcium chloride, calcium superphosphate, calcium amino acid, calcium supplement, etc. should be sprayed during the tomato fruiting period to meet the tomato calcium requirement. The interval between fertilization on tomato leaves should be appropriate, and the appropriate interval for tomato fertilization should be 5 to 7 days. Spraying inorganic fertilizers on the leaves is easy to produce fertilizers, so the interval time should be longer and generally should not be shorter than 7 days. The time interval for spraying organic nutrient fertilizers may be appropriately shorter, generally about 5 days. The foliar fertilizer should be applied in an appropriate amount. When the leaf is damaged, the surplus fertilizer should be rinsed with water, and the water content of the leaf should be increased to reduce the damage of the leaf. When the soil moisture content is insufficient, it should be watered to increase the water content of the plant body and reduce the concentration of fertilizer solution in the stems and leaves.