Yellow-leaf disease, lobular disease, and fruit shrinkage in apple trees are the physiological diseases caused by the deficiency of nutrients. The root cause is the lack of soil organic matter. The three elements of iron, zinc, and boron in the soil are fixed and leached. Loss caused by malnutrition of the tree. Many foliar fertilizers were used in the production, but their effectiveness was short and the effect was poor. Organic fertilizer has the functions of water retention and fertilizer retention. In combination with autumn basal fertilizer, ferrous sulfate, zinc sulfate, borax, or boric acid can be mixed with organic fertilizers and applied to diseased trees to prevent the fertilizers from being fixed and leached away. The effective period is long. The specific method is:
Yellow leaf disease prevention depends on the size of the tree. Each plant is mixed with 0.25-0.5 kg of ferrous sulfate in the basal fertilizer, mix well with organic fertilizer, and water after application to prevent phytotoxicity.
Prevention and treatment of lobular disease Each plant and base fertilizer mixed with 0.25-0.75 kg zinc sulfate, watering after application, the next year effective, long effective period.
Control guava disease applies 0.15-0.2 kg borax per plant. If boric acid is used, the amount is reduced by 1/3. Watering after application is valid for 3-5 years.
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