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Determination of Significance：
Rapidly available phosphorus is a phosphorus component that can be absorbed by plants in the soil, including all water-soluble phosphorus, partially adsorbed phosphorus, easily mineralized organic phosphorus, and some dissolved precipitated phosphates.
Measurement Principle：
The alkaline -soluble phosphorus and adsorbed phosphorus are extracted by a weak alkaline method, and molybdenum blue and phosphate generated a substance with a characteristic absorption peak at 660 nm. By measuring the light absorption at 660 nm, the phosphorus content can be calculated.
Self Provided：
Spectrophotometer/ microplate reader, centrifuge, water bath, analytical balance, transferpettor, micro glass cuvette/ 96 well flat-bottom plate, distilled water, vortex oscillator and 20 meshes sieve.
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