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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：
Extraction of acid-soluble phosphorus and adsorbed phosphorus by double acid method. In acid environment the content of rapidly available phosphoru can calculated by molybdenum blue method.
Self Provided：
Microplate reader or spectrophotometer, centrifuge, water bath, analytical balance, transferpettor, micro glass cuvette/96 well flat-bottom plate, distilled water and 20 mesh sieve.
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