The causes of fertilizer damage are related to the type of fertilizer, the method of fertilization and the dryness and wetness of the soil in the orange orchard. Applying organic fertilizer or mixing fertilizer and soil fertilizer, the orange tree rarely suffers from fertilizer damage, while the single application of chemical fertilizer is prone to fat damage. The same is chemical fertilizer, ammonium chloride citrus is the most susceptible to fertilizer damage, followed by ammonium sulfate, urea, ammonia, ammonium bicarbonate, etc., the application of compound fertilizer and superphosphate is less harmful. Heavy dosage and improper fertilization methods are the main causes of citrus damage. The same amount of fertilization, dig hole dry application is more likely to cause fat damage than watering the ditch. Especially when the soil is dry, dig a hole and dry it. After the application, it will be sunny and rainy. Once it rains, the fertilizer may come more quickly and seriously.
The measures to prevent fertilizer damage first advocate scientific fertilization. The citrus fertilizer should be dominated by soil organic fertilizer. The soil fertilizer can provide multiple nutrients for orange trees and improve soil structure, and the fertilizer efficiency is longer. Winter and spring base fertilizers are more suitable for cake fertilizer, bar fertilizer, garbage, river pond mud and human dung. The effect of soil fertilization after decomposing is better. If it is not piled and maturized, it should be better to dig trenches outside the canopy drip line when using. When using chemical fertilizers for top dressing, it must be applied with water, and avoid dry cooking when the soil is dry. The amount of fertilizer should not be too much, especially the nitrogen fertilizer should pay more attention to the application rate. The annual yield of 50 kg of orange trees, the amount of pure nitrogen applied per plant should not exceed 250 grams. Top dressing, the concentration of fertilizer can not exceed 0.5%.
After the fertilization emergency treatment, when the old leaves of the branches are peeled off, the soil in the fertilization part should be quickly opened, and the soil in the fertilization point should be washed with water to dilute the soil fertilizer concentration and cut off the rotten roots. Cover the new soil. Scrape the root neck, the rotten skin of the main part, apply the bactericidal agent, prevent the spread of the plaque, and cut off the dead branches.
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