Citrus garden should pay attention to prevent chemical fertilizer damage

Symptoms of citrus damage The symptoms of citrus fertilizer appear within 10 to 60 days after fertilization . First, the water from the old tip of the branch begins to lose water and turn yellow or yellow, and then the coke falls. The new leaves on the top of the branch fall or are dried on the branches. Not falling. Checking the dead branches with severe fertilizer damage, the main branches and side branches of the aboveground parts opposite to the fertilization site can be found, and severe rotten skin occurs. When the skin was scratched, the bark was brownish and the branches were dehydrated. Excavation observation, the "burlap root" in the fertilization site and the nearby topsoil is completely rotten, and the root bark of the fine root and the coarse transverse root is rotten and peeled, and extends to the root neck, the trunk and the main branch. The orange tree that survives the lighter degree of fatness is generally not able to be extracted from a new shoot. If the fat occurs in front of the flower, it cannot bloom.

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. The amount of weight and improper fertilization method is the main cause citrus fertilizer 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 digging dry application, after the long sunny Shi does not rain, once it rains, fertilizer damage may come more quickly and more severely.

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. After the soil is fertilized, the effect is better. If it is not piled and maturized, it should be used in the trenching line outside the canopy drip line. When applied as top dressing fertilizer, watering must be water, avoid digging dry application when 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% .

See you branch off the base of the old leaves scorched fertilizer damage after emergency treatment fertilization, soil fertilization shall promptly clawed parts, wash with water pouring Cave fertilize the soil, to dilute fertilizer solution concentration in the soil, and cut off the rotten already dead coarse roots, then 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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