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Fruit tree fertilization should pay attention to the problem
Do not use ammonium nitrate on fruit trees. Nitrate nitrogen is easily absorbed during the growing season, but after applying ammonium nitrate, the nitrate ions can be quickly taken up by the tree and may lead to overconsumption, potentially causing toxic buildup in the plant. This can negatively affect the health and productivity of the fruit trees.
Second, avoid applying ammonium bicarbonate in dry conditions. Ammonium bicarbonate is highly unstable and tends to volatilize quickly. When using it as a base fertilizer or top dressing, make sure the orchard soil is moist, and cover the soil immediately after application. If the soil is very dry, it's better to water first before applying ammonium bicarbonate to reduce losses and improve effectiveness.
Third, do not repeatedly apply ammonium sulfate. In orchards with acidic to slightly alkaline soils, continuous use of ammonium sulfate can increase soil acidity, leading to compaction and reduced root activity. This can result in poor growth, lower yields, and diminished fruit quality over time.
Fourth, avoid watering immediately after applying urea. The nitrogen in urea needs to be converted into ammonium carbonate by soil microorganisms before it can be absorbed by the roots. Watering too soon after application can cause nitrogen loss through leaching or volatilization. Therefore, whether used as a base fertilizer or top dressing, urea should be applied 3 to 5 days after watering to ensure optimal nutrient retention and uptake.
From *Modern Fertilization Collection* by Zuo Guangsheng.