PCA diagrams for variables in experiment on Trichoderma spp. inoculated soil originated from different land-use systems. 0_1S—original grassland, C_1S—grassland non-inoculated, T1_1S—grassland inoculated with T. tomentosum, T2_1S—grassland inoculated with T. ghanense, T1_T2_1S—inoculated with the complex T. tomentosum + T. ghanense, 0_2S—original arable soil, C_2S—arable soil non-inoculated, T1_2S—arable soil inoculated with T. tomentosum, T2_2S—arable soil inoculated with T. ghanense, T1_T2_2S—inoculated with the complex T. tomentosum + T. ghanense. SOC—soil organic carbon, MHA—mobile humic acid, MFA—mobile fulvic acid, MHS—mobile humic substances, CM—CM-cellulase activity of soil, STN—total N, pH—soil pH, EXCH_K—exchangeable K2O, EXCH_P—exchangeable P2O5.