Effects of nitrogen sources and C/N on the biosynthesis of xylanase and cellulase by Trichoderma reesei were investigated.Peptone is the best nitrogen source for xylanase and cellulase production among the nitrogen sources which have been studied.The highest xylanase activity was 93.3 IU/mL,when nitrogen from ammonium sulfate to that from urea was 1∶3,and when this value was changed to 1∶1,the highest filter paper activity and CMCase activity were obtained,which were 0.263 FPIU/mL and 0.026 IU/mL,respective...