The fruit tree damage generally refers to the burns and damages that occur in the tree body due to improper fertilization. The damage to the tree not only damages the tree body, but also results in losses to the current year and beyond. 1. Common fertilizer damage: When deep-sloped soil and fertilization are deep, the organic fertilizer is too large or the organic fertilizer is too concentrated, or the organic fertilizer is not fermented and decomposed, resulting in burning of the root; excessive, excessive or Too concentrated application of quick-acting fertilizers such as urea, potassium nitrate, ammonium sulfate, and ammonium bicarbonate causes burning of roots; when top dressing is performed, the concentration of fertilizer solution is too high, causing the leaves to become agitated and dry; improper use of long-term fertilization results in deeper soil Acidification or alkalization is caused by too high sourness and alkalinity of the soil solution; the soil has less organic matter, the soil is sticky and overly compacted, the applied chemical fertilizer is not easily dispersed, and the local concentration of the fertilizer is too high and the root is damaged; Unqualified fertilizers are also prone to damage. 2, the method of prevention: In order to prevent the occurrence of fertilizer damage, according to the reasons for the occurrence of fertilizer damage, take appropriate preventive measures. For the fertilizer damage that may occur due to organic fertilizer applied to soil deep-turning and deep-groove ditching, it is necessary to adopt methods such as modulating fine manure, even fertilizing, excrement mixing, and watering after fertilizing; for fertilizers that may occur due to chemical fertilizer, To adopt a reasonable variety of fertilizers due to the nature of the soil, to balance fertilization, to control the amount of chemical fertilizers, to use less amount of each time, to grasp the principle of “a small number of timesâ€, to open more trenches, to open wider trenches, to spread evenly, and to use with water. Into the method of prevention; on the fertilizer caused by root fertilization may cause harm, we must choose a safe type of fertilizer, strictly control the use of concentration (usually 0.3-0.5%) and the use of the time, avoid spraying at high temperatures and other methods to prevent; For the fertilizer damage that may be caused by over-consolidation of the soil, it must be prevented by deep-turning land, adding organic fertilizer, and returning straw to the field. It is forbidden to purchase and use counterfeit chemical fertilizers. SICHUAN UNIWELL BIOTECHNOLOGY CO.,LTD. , https://www.uniwellbio.com