Why we take 1:20 ratio of soil and NaHCO3 for determination of available phosphorus in soil?

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Prem Baboo

Please see following article

Rajendra Bairwa

Thank you @Prem Baboo

J. C. Tarafdar

@ Rajendra, because it has been found that extracting soil with NaHCO3 at 1:20 ratio the hydroxide and bicarbonate competitively desorb phosphate from soil particles. Moreover the secondary absorption is minimized because of high pH i.e. 8.5.