Measurement Significance: Speed Phosphorus is the phosphorus component that can be absorbed by plant in soil, including all water soluble phosphorus, partially adsorbed phosphorus and organism phosphorus, soil speed phosphorus is limited.One of the main factors of plant growth.

The principle of assay: Extract acid-soluble phosphorus and adsorbed phosphorus using biboic acid method, and determined by molybdenum bismuth resistance.

Required instruments, supplies: flat, normal temperature centrifuge, visible spectrophotometer / enzyme symbol, trace quantum-based cuvette / 96-well plate, oscillator.

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