Agronomic traits of white oat treated with the growth regulator trinexapac-ethyl

Abstract

The growth and yield performance of white oat cultivars may vary in response to doses of trinexapac-ethyl (TE) growth regulator. The objective of the work was to evaluate the lodging and productive performance of white oat cultivars under different doses of trinexapac-ethyl growth regulator. The experiments were carried out in a randomized complete block design with four replications, in a 4 x 2 factorial scheme, with four doses of trinexapac-ethyl (0, 50, 100 and 150 g ha -1 ) applied in the phenological stage between the 1 st visible stalk node and the 2 nd perceptible node in two white oat cultivars (URS Altiva and URS Corona). The following were evaluated: plant height, panicle length, panicles per m 2 , spikelets per panicle, grains per spikelet, number of grains per panicle, thousand grain weight, plant lodging and grain yield. The application of trinexapac-ethyl at doses 100 and 150 g ha -1 reduces plant height and panicle components: length, number of spikelets and grains per panicle of the two cultivars. TE doses above 100 g ha -1 provide a significant reduction in lodging with an increase in the number of panicles per m 2 and in grain yield for the two white oat cultivars.

Efeito da dose e época de aplicação de trinexapac-ethyl na produtividade e qualidade fisiológica de sementes de aveia branca

“…Therefore, application of growth regulators has become a common practice to control lodging (Bazzo et al, 2018). Growth regulators reduce plant height and minimize the risk of lodging throughout the crop cycle, potentially contributing to the production of seeds with high physiological quality (Fernandes et al, 2023;McMillan et al, 2020).…”

“…2024 observed in the flag leaf, which grows more upright, improving the use of environmental resources, particularly solar radiation (Penckowski & Fernandes, 2010). Ultimately, these effects can alter the partitioning of photoassimilates, improving seed filling and the physiological quality of seeds (Fernandes et al, 2023).…”