According to the growth of tomatoes to determine the type of nutrients generally speaking, 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.
It is necessary to determine the type of nutrients according to the weather. The lack of sunlight in the rainy days in the greenhouse and poor photosynthesis cause the sugar supply of the tomatoes to be insufficient. At this time, the effect of spraying sugar on the leaves is better.
The timely spraying of calcium fertilizer on the leaves requires more calcium in the growth of tomato fruits, and when the soil supply of calcium is insufficient, the fruit is susceptible 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.
The appropriate time interval for fertilizing tomato leaves to apply fertilizer to tomato leaves is 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 interval between spraying organic nutrient fertilizers may be appropriately shorter, generally about 5 days.
Tomato leaves should be paid attention to the application of fertilizer and disease prevention combined with winter and spring seasons, foliar fertilizer will often cause air humidity in the protected area increased significantly, easily lead to tomato disease. 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.
When foliar fertilizer is applied to the foliar application of shrubs, excessive fertilizer should be rinsed off with clean 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.
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