Effect of Trichoderma spp. and different organic manures on growth and development in soybean [Glycine max (L.) Merril.]

Evaluation of soil microorganisms and their beneficial relationships among ecosystem components is one of new topic in soil resource management for ensuring sustainable agriculture. In order to investigating effects of Trichoderma spp. and different organic manures on improvement of growth and development in soybean [Glycine max (L.) Merril.], an experiment was conducted at glasshouse in Sari Agricultural and Natural Resources Sciences University. The pot experiment was laid out factorial based on completely randomized design with four replications. Four seedbed materials [consisted of field soil as control, vermicompost and municipal waste compost (20 ton/ha) and farmyard manure (30 ton/ha)] and two species of Trichoderma (including T. harzianum and T. viridae) with a check were the treatments. Results showed that application of vermicompost, compost and farmyard manure enriched with T. viridae increased soybean root weight as much as 19.6, 37.7 and 18.3 percent, respectively. Inoculation of two fungi with farmyard manure and compost significantly increased shoot and plumelet weight. Furthermore, application of two fungi with farmyard manure and compost simultaneously increase seedling emergence percent compared to control. However, only T. harzianum and compost combination had additive effect in terms of final emergence percent. Overall, inoculation of T. harzianum could improve cumulating emergence rate (CER) compared to control.