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Fig. 2. Source of microbial phosphorus (P_hex) after plant residue amendment or addition of inorganic phosphorus (added P_i) in (a) soil from crop rotation continuous maize (COM) and (b) soil from crop rotation maize-crotalaria fallow rotation (MCF); error bars show SD of P_hex in the respective treatment; dotted line indicates average level of P_hex after carrier-free labeling of isotopically exchangeable soil P.

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