The second is the lack of water application of ammonium bicarbonate. Ammonium carbonate is extremely unstable and volatile. Therefore, whether ammonium bicarbonate is used as a basal fertilizer or topdressing, it should be applied in the wet orchard, and the soil should be covered immediately after application. If the soil is particularly dry, it is better to apply it after watering. Third, it is impossible to repeatedly apply ammonium sulfate. The acidity of the soil to the slightly alkaline soil in the orchard, if the continuous application of ammonium sulfate will increase the acidity of the soil, resulting in soil compaction, affecting the root activity of fruit trees, the poor growth of fruit trees, resulting in a serious decline in fruit yield and quality. Fourth, after applying urea, it cannot be watered immediately. The nitrogen contained in urea can only be absorbed by the roots of fruit trees after being transformed into ammonium carbonate by the action of microorganisms in the soil. If water is applied immediately after applying urea, nitrogen can be easily lost. Therefore, whether urea or topdressing fertilizer, should be applied 5 to 7 days before watering.
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Fruit tree nitrogen fertilizer four wrong
First, no ammonium nitrate can be applied. During the growth of fruit trees, it is easy to absorb nitrate nitrogen fertilizer. If ammonium nitrate fertilizer is applied, nitrate ions absorbed by fruit trees will be excessively consumed and cause accumulation of poisoning.