Fertilizer application in greenhouse tomato leaves usually starts from the fruit set, until the plant pulls, and plays an important role in the formation of tomato yield. Foliar fertilization should adopt different management methods for different situations in a timely manner. Specific attention should be paid to the following points: 1, according to the growth of tomatoes to determine the type of nutrition In general, the results of the previous period, plant growth is relatively strong, easy to grow, should use less to promote the growth of leaf and leaf nutrition, potassium dihydrogen phosphate, compound fertilizer can be used. At the end of the result, the growth potential of the plants began to weaken, and the leaf nutrients that promote the growth of stems and leaves should be used to promote the protection of the leaves. Urea, sugar and special foliar nutrients such as Dayuan No. 1 and Jiakean can be used. 2, according to the weather conditions to determine the type of nutrition cloudy snow weather, lack of light in the greenhouse, poor photosynthesis, tomato sugar supply is insufficient, the effect of foliar spray is better. 3. The timely spraying of calcium fertilizer on leaves requires more calcium for fruit growth. When the soil supply is insufficient for calcium, the fruit is susceptible to umbilical rot. Therefore, it is advisable to spray calcium chloride, calcium superphosphate, calcium amino acid, calcium supplement and other calcium fertilizers to meet the tomato calcium requirement during the tomato fruiting period. 4. The appropriate time interval for application of tomato leaf foliar fertilization to the suitable time for tomato leaf surface fertilization is 5 days to 7 days. Wherein, the inorganic fertilizer that is easy to produce fertilizer on foliar spray should have a longer interval, which is generally not less than 7 days. The spraying time of organic nutrition can be appropriately shorter, generally about 5 days. 5, tomato leaf fertilization should pay attention to combining with disease prevention in the greenhouse in the winter and spring season foliar fertilizer will often cause the air humidity in the protected area increased significantly, easy to cause tomato disease. Therefore, the number of sprayed fertilization materials on cloudy days is less. When fertilizing, protective fungicides such as Antaisheng and Dupont are added, and short-term ventilation is used after fertilization to reduce the incidence. 6. When leaf foliar fertilizers are used improperly to injure leaves, wash the leaf surface with water, rinse off excess fertilizer, and increase the water content of leaves to ease the degree of leaf damage. When the soil moisture content is insufficient, watering is also required to increase the water content of the plant body and reduce the concentration of fertilizer solution in the stems and leaves.
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