TRINEXAPAC-ETHYL REDUCES PLANT HEIGHT AND SEED YIELD IN FORAGE SORGHUM

MARCOS PAULO MINGOTE JULIO, PAULO CESAR MAGALHÃES, ATHOS RODRIGUES SOARES VIANA, BRUNO HENRIQUE MINGOTE JULIO, CRISLENE VIEIRA DOS SANTOS, NADIA NARDELY LACERDA DURÃES PARRELLA, CICERO BESERRA DE MENEZES

Resumo


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.


Palavras-chave


Sorghum bicolor, hormônio de crescimento, sorgo silageiro, produtividade de sementes de sorgo

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DOI: https://doi.org/10.18512/rbms2021v20e1212