Abstract: Trichoderma agent has promotion effect to biofertilizer, which is an important index to evaluate the efficacy of biofertilizer. However, its growth promoting effect is rarely evaluated in field conditions. We applied three Trichoderma agents with different functionalities to the processing for winter wheat, and plate dilution method to calculation of its colony numbers in earth. We also calculated seedling numbers and seedling period biomass of winter wheat, epiphytotic morbidity and yield of winter wheat. All three Trichoderma agents could successfully colonize and remain active in the whole growth season. T11W content was relatively higher in preharvest soil. Tr01 content was the highest at harvest time. Results show that LTR2 improves seedling emergence of 120.97%, seedling biomass of 54.59%, reduces wheat sharp eyespot disease index of 16.60%, wheat stripe rust disease index of 35.14%, and increases yield of 4.83%. T11W can increase seedling emergence of 146.77%, seedling biomass of 59.54%, but has negative effects toprevention and treatment of controlled diseases and increases yield of 37.79%. Tr01 can increase seedling emergence of 150.00%, has no significant effect to seedling biomass.It can reduce wheat sharp eyespotof 36.49%, but has no positive effect to the reduction of wheat stripe rust.The three Trichoderma agents have different promotion effects to the growth of winter wheat, so they have promotional application value. Our research provides data for research and development of Trichoderma agent.

Key words: winter wheat, Trichoderma wettable powder, yield increase, growthpromotion, field trial, growthpromotion, Trichoderma wettable powder, winter wheat, field trial, yield increase