biodegradation of wheat straw by different isolates of trichoderma spp.

efficient use of agricultural wastes due to their recycling and possible production of cost effective materials, have economic and ecological advantages. a biological method used for degrading agricultural wastes is a new method for improving the digestibility of these materials and favoring the ease of degradation by other microorganisms. this research was carried out to study the possible biodegradation of wheat straw by different species and isolates of trichoderma fungi. two weeks after inoculation of wheat straw by different isolates, oven drying in 75◦c, the samples were weighted and (acid detergent fiber) adf and ndf (neutral detergent fiber) reductions of each sample under influence of fungal growth were compared with their controls. the results showed that biodegradation of wheat straw were closely related to fungi species and also its isolates. the reductions in ndf and adf of wheat straw by t. reesei and t. longibrachiatum were more pronounced compared to others, although t. reesei was superior in adf of wheat straw reduction. it is concluded that for improving in digestibility and also shortening the timing of composting process, it is recommended to treat the wheat straw with trichoderma fungi and especially with t. reesei and t. longibrachiatum that performed well and had excellent efficiencies.