1 When the soil is deep-turned or deep-fertilized, the roots of the organic fertilizer are too large or the application is too concentrated. In this case, there are more shallow soil layers deeper than 20 cm deep in the orchard where no water is poured.
2 Excessive, excessive, or excessively concentrated application of readily available nitrogen fertilizers such as urea, ammonium nitrate, ammonium sulfate, and ammonium bicarbonate, cauterize the root system to brown, and in severe cases, it also results in death of large branches or pruning.
3 Fertilizer concentration is too high when dressing fertilizers outside, causing the leaves to be agitated 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.
4 Apple urea topdressing during the young fruit period, in the case of low temperature, high humidity climate, easy to damage the fruit, produce fruit rust.
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