Monte Carlo permutation tests carried out for all canonical axes confirmed the significance of the relationship between the two datasets (a: F = 4.07, P = 0.03; b: F = 8.67, P = 0.04). TN, total N; AP, available P; AK, available K; DI, tomato disease incidence; Rs, R. solanacearum population; BR, bacterial population richness; BH, microbial diversity of bacterial community; FR, fungal population richness; FH, microbial diversity of fungal community; Phosph, phosphomonoesterase activity; Aryl, arylsulfatase activity; β-gluco, β-D-glucosidase activity; Dehydro, dehydrogenase activity; Urea, urease activity; FDA, fluorescein diacetate hydrolase activity; MBC, microbial biomass carbon; SR, soil respiration.