Qualidade fisiológica e sanitária de duas cultivares de aveia branca após aplicação de redutor de crescimento e fungicida

Abstract

This study aimed to evaluate the growth reducer (trinexapac-ethyl) effect on the physiological and sanity quality of white oat seeds (Avena sativa). The experiment was conducted at the Universidade Federal da Fronteira Sul - Campus Erechim (Rio Grande do Sul State, Brazil) with cvs. URS Brava and URS Corona, originating from plants subjected to treatments with different doses of the regulator, being: T1) control - without reducer and without fungicide; T2) control - without reducer and with fungicide (trifloxystrobin + tebuconazole; 100 g L-1 + 200 g L-1; dose: 0.6 L ha-1); T3) growth reducer (200 mL ha-1) + fungicide; T4) growth reducer (300 mL ha-1) + fungicide; and T5) growth reducer (400 mL ha-1) + fungicide. The experiment was conducted in a completely randomized design, with four replicates per treatment. Were analyzed: seed moisture content, electrical conductivity, germination and vigor (first germination count), seedling length and dry mass, accelerated aging, sanity and seedling emergence in the greenhouse. After analyzing the data, it was found that, although some variables did not present statistically significant differences, there was a tendency for a reduction in the physiological quality of the seeds with the increase in the doses of the regulator, especially for germination and vigor. In the health aspect, there was a high incidence of Fusarium spp. in all treatments, but only the fungus Rhizopus spp. showed a significant difference between the treatments. It is concluded that the use of high doses of growth reducer can compromise the physiological and health performance of the seeds, requiring judicious use of the reducer to avoid negatively affecting the quality of the seeds produced.