In most of the soil researches read and soil science manual, 2 mm soil is used for routine analysis and 0.5 mm for Organic C, and there is no explanation why this is so. Can anyone tell me the reason
I can only guess:
The coarse fractions contain timely and spatially varying proportions of organic litter, which have yet barely contributed to soil formation and which are difficult to interpret quantitatively with regard to soil organic C and total soil N contents.
The organic C- (and N-containing) component in the fine fraction is more wheathered and thus better intimitely mixed with the anorganic soil matrix. Therefore, organic soil particles in the fines can be seen more as meta-stable components of the soil matter than as litter any more ...
I hope, that helps a bit further.
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