How to topdress the pomegranate tree in summer

Extra-root top dressing is foliar fertilizer, and a proper amount of fertilizer solution is evenly sprayed on the pomegranate leaves. One is to increase tree nutrition, increase yield, and improve fruit quality. Generally, fruit weight increases by 1.5% to 3.5%, and yield increases by 5% to 10%. The second is to promptly supplement the demand for trace elements of some element deficiency diseases. The advantages of foliar fertilization are fast absorption, fast response, and obvious effect. Generally, it can be absorbed 15 minutes to 2 hours after spraying. After 10 to 15 days, the leaves react obviously to fertilizer elements, which can prevent many trace elements from being easily affected by the soil after being applied to the soil. The disadvantages of fixing and reducing fertilizer efficiency.

25-30 days after foliar fertilization and spraying, the leaf's response to fertilizer elements gradually disappears, so it can only be supplemented by soil fertilization. The large amount of nutrients required for the growth of pomegranate trees still depends on soil fertilization. The optimum temperature for foliar fertilization is 18℃～25℃, so the spraying time in summer is before 10 am and after 4 pm. When spraying, the atomization should be good and the spraying should be even. Pay special attention to increasing the amount of fertilizer on the back of the leaf.

Generally, water-soluble fertilizers can be used as extra-root topdressing, and different fertilizer varieties are selected according to the purpose of fertilization. Foliar fertilizer can be combined with pesticides to prevent pests and diseases. However, when mixing spraying, care must be taken not to reduce the efficacy and fertilizer efficiency. For example, alkaline pesticide lime sulfur mixture and Bordeaux mixture cannot be mixed with superphosphate, manganese, iron, zinc, molybdenum, etc.; while urea can be mixed with Bordeaux mixture, dichlorvos, phoxim and other pesticides.

The foliar spray concentration should be accurate to prevent phytotoxicity and fertilizer damage. When spraying, a small amount of wetting agent, such as soap liquid, washing powder, saponified oil, etc. can be added to make fertilizers and pesticides adhere to the leaf surface and improve the effects of fertilizer absorption and pest control.

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