Measurement Significance: Ammonium nitrogen in the soil can be adsorbed by the soil colloid, which is exchanging ammonium nitrogen fertilizer, and can be dissolved in the soil solution, which can be directly absorbed by plant, belonging toSpeed aerobic nitrogen.Determination principle: Ammonium in the soil in a strong alkaline medium and hypochlorite and phenol, producing a water-soluble dye indigo blue, a characteristic absorption peak at 625 nm, and the absorption value is proportional to the ammonium content.

Required instruments, consumables: balance, normal temperature centrifuge, visible spectrophotometer / enzyme label, trace quantity-free cuvette / 96-well plate, oscillator.

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