Droplets size categories and application volumes in burndown of plant covers
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Data
2015-03
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Resumo
This study has aimed to verify the influence of the droplets size categories and
application volumes on burn down Urochloa ruziziensis and Conyza sp. Therefore, two trials were
conducted in a randomized block design with four replications in a 2x4 split plot arrangement. The
plots consisted in droplets size categories (very fine droplets and ultra coarse droplets) and the
subplots consisted in four application volumes (50, 100, 150 and 200 L ha-1). For desiccation,
glyphosate herbicide was used at 0.975 and 1.3 kg of a.e. ha-1 for controlling plant covers Urochloa
ruziziensis and Conyza sp., respectively. Saflufenacil herbicide was used at a dose of 49 g of a.i.
ha-1 in association with glyphosate to control Conyza sp. In the application was used a pressurized
sprayer by CO2 with spray nozzles model ATR 1.0 and AI 110015. At 5, 10, 15 and 20 days after
application (DAA) of the herbicides, visual assessments were done of the control percentage of
Urochloa ruziziensis and defoliation in Conyza sp. At 25 DAA, one regrowth percentage
assessment of Conyza sp. plant was done. It is concluded that the category of ultra coarse droplets
is efficient for desiccation of Urochloa ruziziensis with volumes of up to 50 L ha-1, while the
category of very fine droplets reduces the efficacy with reduced volume application. It was also
found that reducing the application volumes increases the possibility of regrowth on burn down
Conyza sp.
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Palavras-chave
Urochloa sp., Conyza sp., Spectrum of droplets, Application technology, Espectro de gotas, Tecnologia de aplicação
Citação
ALMEIDA, Dieimisson Paulo et al. Droplets size categories and application volumes in burndown of plant covers. Revista Brasileira de Herbicidas, Londrina, v. 14, n. 1, p. 73-82, jan./mar. 2015.