One avoid application of ammonium nitrate. 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 cause excessive accumulation of toxic poisons.
Second bogey water application of ammonium bicarbonate. Ammonium carbonate is unstable and volatile. Therefore, whether ammonium bicarbonate is used as a basal fertilizer or topdressing, it should be applied in the case of wet orchard and soil immediately after application. If the soil is particularly dry, it is better to apply it after watering.
Three avoid repeated application of 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.
Four bogey urea immediately after watering. 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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