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1. According to the growth of tomatoes, the type of nutrition should be determined: Generally speaking, in the early stage, the growth of the plants is relatively strong, and it is easy to grow, and the leaf nutrition that promotes the growth of stems and leaves should be used less. Potassium dihydrogen phosphate, compound fertilizer, etc. can be used. At the peak of the period, the growth potential of the plant began to weaken. The leaf nutrients that promote the growth of stems and leaves should be used to promote the leaf protection. Urea, sugar and Dayuan No.1, Jiagean and Other leaf-specific nutrient solutions can be used.
2. According to the weather conditions, the type of nutrition should be determined: the snowy weather, the lack of light in the greenhouse, the poor photosynthesis, the insufficient supply of sugar in the tomatoes, and the better effect of spraying sugar on the leaves.
3. Spraying calcium fertilizer in time: The growth of tomato fruit requires more calcium. When the soil is insufficient for calcium, the fruit is prone to umbilical rot. Therefore, in the tomato fruiting period, it is recommended to spray calcium fertilizer such as calcium chloride, superphosphate, amino acid calcium and calcium supplement to meet the needs of tomatoes for calcium.
4. The interval between fertilization of tomato leaves should be appropriate: the suitable interval for fertilization of tomato leaves is 5-7 days. The interval between inorganic fertilizers in which foliar spray is easy to produce fertilizer should be longer, generally not shorter than 7 days, and the spraying time of organic nutrition can be appropriately shorter, generally about 5 days.
5. Foliar fertilization of tomatoes should be combined with disease prevention: Foliar fertilization in winter and spring seasons in greenhouses will result in a significant increase in air humidity in the protected areas, which may cause tomato disease. Therefore, even the number of fertilizers sprayed on the cloudy leaves is less. When applying fertilizer, add protective fungicides such as Antaisheng and DuPont Yibao, and short-time ventilation after fertilization to reduce the incidence.
6. Improper use of foliar fertilizer: When wounded leaves occur, rinse the leaves with clean water, rinse off excess fertilizer, and increase the water content of the leaves to alleviate the damage of the leaves. When the soil water content is insufficient, watering is also required to increase the water content in the plant and reduce the concentration of the fertilizer in the stems and leaves.
Greenhouse tomato leaf fertilization precautions
Foliar fertilization of greenhouse tomatoes generally begins after fruit set and until the plants are pulled, playing an important role in the formation of tomato yield. Foliar fertilization should adopt different management methods in time for different situations. The following points should be noted:
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