Effect of trinexapac-ethyl application rate and timing on the yield and physiological quality of white oat seeds
DOI:
https://doi.org/10.5433/1679-0359.2024v45n3p883Keywords:
Avena sativa L, Acamamento, Redutor de crescimento, germinação e vigor.Abstract
Growth regulators can mitigate lodging damage. However, their effects on the physiological quality of seeds are not widely known. This study aimed to assess the effects of trinexapac-ethyl application rate and timing on the yield and physiological quality of white oat seeds. The experiment was conducted in Londrina, Paraná, Brazil, in the 2019 and 2020 cropping seasons using a randomized block design with a 4 × 3 factorial arrangement and four replications. Treatments consisted of four trinexapac-ethyl rates (0, 50, 100, and 150 g ha−1) and three application timings (E1, first node detectable; E2, stem elongation phase from first node visible to second node detectable; and E3, second node visible to third node detectable). Seed yield, thousand seed weight, germination rate, seedling length, seedling dry weight, accelerated aging, electrical conductivity, and seedling emergence in sand were evaluated. The results showed that trinexapac-ethyl at 100 and 150 g ha−1 at E2 and E3 increased seed yield in white oat IPR Artemis. However, all rates negatively affected thousand seed weight, germination rate, and seed vigor, reducing the establishment capacity and initial development of white oat plants.
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