Aislamiento, Caracterización y Evaluación de Trichoderma Spp. Como Promotor de Crecimiento Vegetal en Pasturas de Raygrass (Lolium Perenne) y Trébol Blanco (Trifolium Repens)

The Trichoderma genus of fungi have been widely used in agriculture as biological controllers due to their ability to excrete exogenous enzymes that allow them to act as biopesticides. This fungus has the ability to grow in diverse habitats, and is commonly found in soil and decaying matter. Its role as a plant growth promoter is due to its ability to rapidly colonize plant roots, protecting them from attack by phytopathogens, which results in increased growth and the exudation of phytohormones or the solubilization of phosphates, Fe, Mn, Mg. The objective of this work was to isolate native strains of Trichoderma spp. present in the soil of "La Alegria" farm located in the Pedro Moncayo canton for their subsequent evaluation as plant growth promoters in ryegrass and white clover pastures. The isolated strains were identified by morphological keys as Trichoderma harzianum and Trichoderma viride. The effect as growth promoter was evaluated in the field, in previously established paddocks. After each cutting, the paddocks were fertilized with liquid solutions of the fungus at a concentration of 106 , organic matter (Compost 45% MO) and chemical fertilizer (Fertiforraje). The treatments with the best results were T1 with an average green matter of 12.72 MT/ha/cut and T6 with an average of 11.55 MT/ha/cut, compared to the control and the chemical treatment.