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We investigated the effect of plant residue decomposability and fungal biomass on the dynamics of macroaggregate (250?2000 ?m) formation in a three months' incubation experiment and determined the distribution of residue-derived C and N in the microbial biomass and in aggregate size fractions (250?2000 ?m, 53?250 ?m and <53 ?m) using 13C and 15N data. A silty loam soil (sieved <250 ?m) was incubated with and without addition of 15N labelled maize leaves (C/N = 27.4) and roots (C/N = 86.4). Each treatment was carried out with and without fungicide application. The addition of maize residues enhanced soil respiration and microbial biomass C and N and resulted in increased macroaggregate formation with a higher and...