In the case of phosphorus fractionation, what is the best ratio between extractant and soil?
@ Elaheh, I think 1:2 (soil:extractant) is the best ratio for P fractionation in general. But it may vary depends on soil type and soil organic matter content.
This has already been determined. Look at the original research (back in the 1960's) in the development of the AOAC's Merlich(?) reagent.
@ Elaheh, I have already shared the reference to you.
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