Nitrogen fertilizers commonly used in fruit tree production include urea, ammonium bicarbonate, ammonium nitrate, ammonium sulfate, ammonium chloride and long-acting urea. Urea is an acyl nitrogenous fertilizer with a nitrogen content of 46%, which can be used as base fertilizer, topdressing fertilizer and extra-root fertilizer. Ammonium bicarbonate is an ammonium nitrogen fertilizer with a nitrogen content of 16.5% to 16.8%, which can be used as a base fertilizer and top dressing, but it cannot be used in combination with plant ash to prevent the decrease of fertilizer efficiency. Ammonium nitrate is nitrate, ammonium nitrogen fertilizer, nitrogen content is generally 34% to 35%. Ammonium nitrate is highly hygroscopic and highly soluble. Nitrate is not easily adsorbed by soil colloids, so ammonium nitrate is generally not suitable for basal fertilizer application; when topdressing, a small number of fertilization methods should be adopted, combined with irrigation, strengthening the cultivator, to prevent nitrate accumulation in the soil surface accumulation. The nitrogen content of ammonium sulfate and ammonium chloride is 20% to 21% and 24% to 25%, respectively, which are physiological acidic fertilizers and can be used as base fertilizer and topdressing fertilizer. Acid soils should use as little or as little ammonium sulfate and ammonium nitride as possible, especially when applied with ammonium chloride, must be combined with organic fertilizer and lime to correct adverse effects on soil properties; in saline-alkaline soils, poor drainage, and suffering from apple rough The orchard should be absolutely prohibited. Long-acting urea nitrogen content is generally 32% to 38%, the release of nitrogen in the soil is relatively slow, the most suitable basal fertilizer application. Regardless of the type of nitrogen fertilizer, deep application (especially calcareous soil) should be taken into account when applying the soil. Deep application of soil can improve the effect of nitrogen fertilizer application.
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