Efeito alelopático do óleo essencial de Pinus Taeda sobre a germinação e desenvolvimento inicial de plântulas de azevém, picão-preto e milho

Abstract

The objective of the present work was to evaluate the effect of essential oil of Pinus taeda acicles when applied to ryegrass, spanish niddle and corn seeds. The experiment was conducted in a laboratory of the Federal University of Fronteira Sul – UFFS - Campus Erechim - RS. The oil was obtained by hydrodistillation. For each species 4 replications of 4 treatments were applied varying the doses of the essential oil, being 50 μL, 100 μL; 200 μL and control with 0 μL. Corn germination tests were performed on germitest paper rolls, while ryegrass and spanish neddle were used gerbox boxes, and both were placed in a BOD chamber. Along with the germination test, variables germination speed index (IVG), seedling length, fresh mass and dry mass tests were performed, according to the adopted methodology. Data were submitted to ANOVA and Tukey's test (p <0.05) to compare the means. Pinus taeda essential oil did not affect the germination process of corn seeds, as well as their seedling development. It was found that the essential oil had a negative effect on all the variables analyzed in spanish neddle and ryegrass seeds, and the highest dose (200 μL) completely inhibited seed germination. Pinus taeda essential oil has a potential allelopathic effect, can be explored as an alternative way to control weeds in cultivation systems.