The damage of apple trees generally means that due to improper fertilization, a part (or some part) of the tree body burns or is damaged. There are three kinds of fertilizers commonly used in production: First, when the soil is deep-turned or deep-fertilized, the organic fertilizer is too large or the application is too concentrated, causing root burning. In this case, there are more shallow soil layers deeper than 20 cm deep in the orchard where no water is poured. The second is excessive, excessive, or concentrated application of fast-acting nitrogen fertilizers such as urea, ammonium nitrate, ammonium sulfate, and ammonium bicarbonate, and cauterize the root system to brown. As the fertilizer is transported in the tree, the poisoning phenomenon quickly spreads to the base of the main root, stems and branch shoots, and a banded purple line appears along the xylem. The bark is dry and hollow. In severe cases, large branches or pruning will also be caused. The third reason is that the concentration of fertilizer solution is too high when dressing fertilizers outside the roots, causing the blade to become anxious, or the whole plant to die. The third reason is that the concentration of fertilizer solution is too high when dressing fertilizers outside the roots, causing the leaves to be anxious and dry. Such as borax and other physiological alkaline fertilizers, and zinc sulfate, ferrous sulfate, calcium chloride, calcium nitrate and other inorganic salts, are prone to produce leaf burning phenomenon. The application of urea outside the apple roots in the young fruit period may cause low temperature and high humidity, which may easily damage the fruit and cause fruit rust. About 1 month after flowering, 0.3% urea was sprayed on the Golden Delicious apple, and the fruit rust rate was 80%-90%. Spraying 2 months after flowering basically did not produce fruit rust.
In order to prevent the occurrence of fertilizer damage, it is necessary to take corresponding preventive measures according to the causes of the occurrence of fertilizer damage. For fertilizer damage caused by soil deep-turning or deep-groove fertilization, it can be prevented by adopting finely-prepared manure, uniform fertilization, even soil fertilization, and post-application irrigation. For the fertilizer damage that occurs due to the application of chemical fertilizers, it can be prevented by the use of uniform application and water application. For the fertilizer damage caused by top dressing, you can choose a safe fertilizer type, strictly control the use of concentration and the use of time, to avoid spraying at a high temperature and other methods to prevent.
In order to prevent the occurrence of fertilizer damage, it is necessary to take corresponding preventive measures according to the causes of the occurrence of fertilizer damage. For fertilizer damage caused by soil deep-turning or deep-groove fertilization, it can be prevented by adopting finely-prepared manure, uniform fertilization, even soil fertilization, and post-application irrigation. For the fertilizer damage that occurs due to the application of chemical fertilizers, it can be prevented by the use of uniform application and water application. For the fertilizer damage caused by top dressing, you can choose a safe fertilizer type, strictly control the use of concentration and the use of time, to avoid spraying at a high temperature and other methods to prevent.
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