The effects of pH value on production of cellulase from Trichoderma viride were investigated.The results showed that the cellulase activity was 40.74 IU/ml when the initial pH value of culture media was 4.5.And the cellulase activity was 29.02 IU/ml when the initial pH value of culture media was 6.0.While pH value of culture media was maintained at 7.5,the cellulase activity was 41.35 IU/mL.The maximal cellulase activity reached 58.70 IU/mL at the sixth day when the buffer solution of 0.1 mol/L citric acid ...