Apple lobular disease mostly occurs in orchards with poor soil moisture and good water permeability. Due to low zinc content, soluble zinc salts are lost, and the incidence is serious. The number of watering rainfall is large and the loss of soluble zinc is large. The amount of nitrogen fertilizer is too much and the tree needs to be used. The amount of zinc increases; the pH value of the saline-alkali soil is high, and zinc is easily fixed and cannot be absorbed by the root system. In addition, soil viscosity, shallow living soil layer, poor root development, lobular disease occurs. Therefore, increasing zinc salt supply or releasing fixed zinc is an effective way to prevent and treat this disease. The specific approach is as follows:
Increasing organic fertilizers, improving soils, and increasing organic matter content in the soil can reduce the pH of the soil, increase the solubility of zinc salts, and facilitate the absorption of fruit trees. For the orchards with poor conditions, such as sandy lands, clay lands and saline-alkali lands, the soil should be improved through the addition of soil miscellaneous fertilizers to increase zinc and release solidified zinc elements, which can promote the development of root system and increase the absorption function.
The combination of zinc applied to the soil and zinc spraying by the plant combined with basal fertilization. Each tree was fed with 0.1 to 0.15 kg of zinc sulfate. After application, it was effective in the second year and could last for 3 years. The fruit trees with lobular disease sprayed with 30 times zinc sulfate liquid fertilizer on the trees before germination had obvious effect on the prevention of lobular disease in the year. Three weeks after flowering, a diseased plant with lobular disease was found to be sprayed with 500 times more zinc sulfate and 300 times as much urea as the mixture, which has a significant effect on disease reduction. Even after two years of spraying, the recovery rate of diseased branches was more than 95%, and the yield was also significant. increase.
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