1. The type of nutrition should be determined based on the growth of tomatoes. Generally speaking, in the early stage of fruiting, the plant grows vigorously and is prone to overgrowth. Therefore, less leaf nutrition should be used for stem and leaf growth. Potassium dihydrogen phosphate, compound fertilizers, etc. can be selected. During the peak period of fruit growth, the plant's growth momentum begins to weaken, and more leaf nutrition from stem and leaf growth should be used to promote seedling and leaf preservation.
2. The type of nutrition should be determined based on weather conditions: cloudy and snowy weather, insufficient light in the greenhouse, poor photosynthesis, insufficient sugar supply in tomatoes, and better foliar sugar spraying.
3. Timely application of calcium fertilizer on the leaves: Tomatoes require more calcium for fruit growth. When the soil lacks calcium, the fruit is prone to navel rot. Therefore, it is advocated to spray calcium fertilizers such as calcium chloride, superphosphate, amino acid calcium, and calcium supplements during the fruiting period of tomatoes to meet their calcium needs.
4. The interval time for tomato leaf fertilization should be appropriate: the appropriate interval time for tomato leaf fertilization is 5-7 days. The interval between foliar spraying of inorganic fertilizers that are prone to fertilizer damage should be longer, generally no less than 7 days, and the spraying time for nutrients can be appropriately shorter, generally around 5 days.
5. Tomato foliar fertilization should be combined with disease prevention: foliar fertilization in the winter and spring seasons of greenhouses often causes an increase in air humidity in protected areas, which can easily lead to tomato disease. Therefore, the number of times of foliar fertilizer spraying should be less on cloudy days. Protective fungicides should be added during fertilization, and ventilation should be carried out for a short time after fertilization to reduce the incidence rate.
6. Improper use of foliar fertilizer; When damaged leaves occur, they should be rinsed with clean water to remove excess fertilizer and increase the water content of the leaves to alleviate the degree of damage. When the soil moisture content is insufficient, watering is necessary to increase the water content in the plant body and reduce the concentration of fertilizer in the stems and leaves.
