Efecto de dos tratamientos pregerminativos con tres sustratos en la propagación de Tabebuia chrysantha (jacq.) nicholson (guayacán), en el vivero forestal de la Espoch

Abstract

In Ecuador, there is little research regarding applying pregerminative treatments and adequate substrates that improve the germination of seeds of Tabebuia chrysantha known as guayacán, and its propagation and the establishment of plantations with this species of forestry importance. This research aimed to evaluate the effect of two pregerminative treatments with three substrates on the propagation of T. chrysantha at the nursery level. The methodology was experimental, applying a complete randomized block design with a bifactor structure comprising the factors of pregerminative treatment and substrate. The data collection of the evaluated variables was carried out in 30, 45, and 60 days, respectively. The data obtained were analyzed in the InfoStat program for the respective analysis of variance, a 5% Tukey comparison test for the variables germination percentage, height, and DAC, and the non-parametric analysis Friedman test for the variable number of leaves. It was determined that there are significant differences between the nine treatments applied in the trial at the determined times, both for the percentage of germination, height, and diameter at neck height. At the same time, there were no statistical differences in the number of plant leaves. It was concluded that the pregerminative treatment of immersion of seeds in water for 24 hours at room temperature Pb and the substrate S1 composed of black soil and sand positively influenced the germination of guayacán seeds and the substratum S2 composed of black soil, chicken manure, and sand in the satisfactory development of its vegetative variables.