Uso de Trichoderma spp. como bioestimulante en Ochroma pyramidale, Salix alba y Alnus acuminata a nivel de vivero en la provincia de Chimborazo.

Abstract

The aim of the research was to determine the effectiveness of two fungal species used in biological control belonging to the Trichoderma genre. Trichoderma harzianum and Trichoderma longibrachiatum were evaluated in the development of Ochroma pyramidale, Salix alba and Alnus acuminata at nursery level. The trial included identification phases of the forest species, substrate preparation, sheathing, sowing by seed and stake, preparation of Trichoderma spp suspensions, irrigation, and control of the variables to be evaluated: plant height, Diameter at Collar Height (DAC) that were evaluated at 15, 30, 45, 60 and 75 days after the repotting of the forest species; root length, number of leaves, fresh weight, foliar dry weight and root dry weight which were evaluated at 75 days. An experimental design of Randomized Complete Block Factorial (DBCA) with fifteen treatments and three replicates was used. Inoculation of Trichoderma spp. was carried out on three times with a concentration of 1x106 cfu/mL. Finally, the Dickson quality index was calculated for the evaluation of the best treatments in each forest species. It was concluded that the three species had an effect by the fungus, however, Alnus acuminata was the specie that obtained the best response by T. harzianum strain 1 in the evaluated variables height, fresh weight and root dry weight, while T. longibrachiatum strain 2 showed superiority when evaluating the variables Diameter at Collar Height (DAC), root length and leaf dry weight in the species Alnus acuminata. However, for the species Salix alba and Ochroma pyramidale, T. longibrachiatum was effective in the variable number of leaves when applying strain 1, so it was recommended to enhance the study on these fungal species in different existing forest species.