Measurement Significance: Nitrid nitrogen is nitrogen in nitrogen, and organic matter in the soil decomposes to form an ammonium salt, and is oxidized to nitrate nitrogen.Soil nitrous nitrogen is one of the main forms of higher plants absorbing nitrogen, and its content is directly related to crop yield and quality \u0026 nbsp; measurement principle: NO3- with salicylic acid, producing nitro waterAcid, nitrogenated salicylic acid under alkaline conditions (pH \u0026 gt; 12), in a certain range, its color depth is proportional to the content, which can be calculated to calculate the nitrate nitrogen content.

Instruments, consumables: distilled water, balance, normal temperature centrifuge, visible spectrophotometer / enzyme symbol, trace quantum-based cuvette / 96-well plate, oscillator.

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