Fig. 1. Activity (% of initially added; 3800 unit g^-1) of free or immobilized laccase of Trametes villosa in soils under 55% of maximum water-holding capacity (WHC) moisture condition, as determined by a biological oxygen monitor with 2,6-dimethoxyphenol as substrate. The standard error (SE) for activity (%) ranged between 0.1 and 2.3.