Tomato leaves fertilization pay attention
1. According to the growth of tomatoes to determine the type of nutrients. In general, the results of early plant growth is relatively strong, easy to grow long, should use less to promote the growth of stems and leaves foliar nutrients, can use potassium dihydrogen phosphate, compound fertilizer and so on. The results of the growth period of the plant growth potential began to weaken, should use more to promote the growth of stems and leaves foliar nutrients to promote conservation of leaves, can choose urea, sugar and so on. 2. According to the weather conditions to determine the type of nutrients. Insufficient sunshine in the greenhouse during rainy days, poor photosynthesis, making the supply of sugar for tomatoes is insufficient, at this time the effect of spraying sugar on the leaves is better. 3. Spray foliar calcium fertilizer in time. Tomato fruit growth requires more calcium, soil calcium deficiency, the fruit prone to umbilical rot. Therefore, calcium chloride, calcium superphosphate, calcium amino acid, calcium supplement, etc. should be sprayed to meet tomato's requirement for calcium in the tomato's result period. 4. The interval between fertilization on tomato leaves should be appropriate. The appropriate interval for fertilizing tomato leaves is 5-7 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 interval between spraying organic nutrient fertilizers may be appropriately shorter, generally about 5 days. 5. Tomato leaf fertilization should be combined with disease prevention. Foliar fertilization in winter and spring seasons often results in a significant increase in air humidity in the protected areas, and can easily cause tomato diseases. Therefore, the number of sprayed fertilization materials on the cloudy days should be less, and the protective fungicides such as Antaisheng and DuPont EPC should be added during fertilization, and short-term ventilation should be carried out after fertilization to reduce the incidence rate. 6. Shi Xi surface fertilizer to be appropriate. When injury occurs, flush the excess fertilizer with water and increase the water content of the leaves to reduce the damage to the leaves. 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.