I am doing a research on sequential extraction of phosphorus and I do not understand why they all separate organic and inorganic phosphorus forms.
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.573.4064&rep=rep1&type=pdf
http://www.tandfonline.com/doi/abs/10.1080/00103629109368523
https://repository.si.edu/bitstream/handle/10088/3976/Turner_Cade_Condron_and_Newman_2005.pdf?sequence=1&isAllowed=y
Dear Pariya, accurate identifications of phosphorus forms are very important for understanding the geochemical cycle of P and availability of P during plant growth. In general, NaHCO3 extractable (labile) fractions are expected to be available during crop growth. A small fractions of NaOH and HCL extractable P may also be expected to be taken up by the plants. To know the both organic and mineral fractions are also very important as organic P has to hydrolyzed by phosphatase or phytase enzymes before being utilized to the plants. We need to know the residual fractions of P also as that part can not be utilized by plants unless and until it is converted to labile fraction with time .
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