Author(s): JULIO, M. P. M.; MAGALHAES, P. C.; VIANA, A. R. S.; JULIO, B. H. M.; SANTOS, C. V. dos; PARRELLA, N. N. L. D.; MENEZES, C. B. de

Summary: Forage sorghum presents tall plants, what makes mechanical seed harvesting a difficult task. Plant hormones can reduce plant height and facilitate the harvesting. Thus, the objective of this study was to evaluate the effect of the growth regulator trinexapac-ethyl on plant height and seed yield in forage sorghum. This research was carried out at Embrapa Maize and Sorghum, in two seasons (2017 and 2018), in a randomized complete block design, four replications and three varieties (BRS Ponta Negra, 1141574 and 0947216) under application of Trinexapac-ethyl in two stages of the plant growth (V8, V12, V8 + V12). The characteristics evaluated were: plant height, seed yield and mass of 1000 seeds. The effect of the hormone was significant in both stages of growth, with a significant reduction in plant height. The hormone applied twice at growth stages V8 + V12 had a greater effect in reducing plant height. However, the hormone reduced seed yield in the three varieties, what implies the need for further studies comparing the advantage of plant height reduction and the loss in seed yield.

Publication year: 2021

Types of publication: Journal article

Unit: Embrapa Maize & Sorghum

Keywords: Crescimento, Hormônio, Plant growth, Produtividade, Semente, Sorghum Bicolor, Sorgo