Abstract
Forage sorghum presents tall plants, what makes mechanicalseed harvesting a difficult task. Plant hormones can reduce plant height andfacilitate the harvesting. Thus, the objective of this study was to evaluatethe effect of the growth regulator trinexapac-ethyl on plant height and seedyield in forage sorghum. This research was carried out at Embrapa Maizeand Sorghum, in two seasons (2017 and 2018), in a randomized completeblock design, four replications and three varieties (BRS Ponta Negra, 1141574and 0947216) under application of Trinexapac-ethyl in two stages of the plantgrowth (V8, V12, V8 + V12). The characteristics evaluated were: plant height,seed yield and mass of 1000 seeds. The effect of the hormone was significantin both stages of growth, with a significant reduction in plant height. Thehormone applied twice at growth stages V8 + V12 had a greater effect inreducing plant height. However, the hormone reduced seed yield in the threevarieties, what implies the need for further studies comparing the advantageof plant height reduction and the loss in seed yield.
Highlights
RESUMO - O sorgo silageiro possui plantas de porte alto, o que dificulta a colheita mecanizada em campos de produção de sementes
There was a significant effect for the source of variation years for the characteristics plant height and a thousand-seed mass
The source of variation hormones was significant for seed yield and plant height, indicating the influence of the hormone on these characteristics
Summary
RESUMO - O sorgo silageiro possui plantas de porte alto, o que dificulta a colheita mecanizada em campos de produção de sementes. O objetivo deste estudo foi avaliar o efeito do regulador de crescimento trinexapaqueetílico em sorgo forrageiro, visando a redução de altura de plantas para facilitar a colheita de sementes. Silage sorghum plants have strong stalks, height of 2.5 m, with a good balance in the grain/plant ratio and high dry matter yield, which guarantees high quality forage. This type of sorghum still shows good digestibility, which reflects in animal nutrition, being an excellent forage, used in cattle feedlots, and especially in dairy production (Rodrigues et al, 2015). The ensiling process is done by crushing the green mass of the plant, making the storage in the silo, compaction, sealing and ingestion by animal’s easier, increasing palatability (Senger et al, 2005; Dunière et al, 2013)
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