Fig. 2From: Urease and β-glucosidase activity enhanced the transformation of functional groups of humin amended by straw and straw-derived biocharRelationships of aryl C and other functional groups (a and b) and hydrophobicity of Hu (c), β-glucosidase activity and functional groups of Hu (d and e), urease activity and alkyl C of Hu (f). Notes: All the figures were n = 12, except the figure c was n = 15Back to article page