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Fig. 1. Amount of P, recovery of 33P and relative specific activity (rel. SA) in (a–c) resin-extractable phosphorus (Presin) and (d–f) microbial phosphorus (Phex) after addition of 6 mg P kg–1 soil as plant residue or inorganic phosphorus (added Pi), both labeled with 33P, or after carrier-free labeling of isotopically exchangeable phosphorus (soil IEP) in soils with continuous maize (COM) and maize-crotalaria fallow rotation (MCF); bars show Tukey's honestly significant difference (0.05).
