Navegando por Autor "Feliciano, Arcanjo Miguel Fama"

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    Dissertação
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    Deriva em função de misturas de herbicidas e de pontas de pulverização
    (Universidade Estadual do Norte do Paraná, 2017-03-29) Feliciano, Arcanjo Miguel Fama; Oliveira, Rone Batista de; https://orcid.org/0000-0002-3071-4827; http://lattes.cnpq.br/2379804514613050; Oliveira, Rone Batista de; https://orcid.org/0000-0002-3071-4827; http://lattes.cnpq.br/2379804514613050; Osipe, Jethro Barros; http://lattes.cnpq.br/9692340257207288; Ferreira, Marcelo da Costa; https://orcid.org/0000-0002-0159-7422; http://lattes.cnpq.br/3661533094675596; Tashima, Hatiro; https://orcid.org/0009-0008-8757-4600; http://lattes.cnpq.br/0514640010249563; Rodrigues, Euripedes Bomfim; https://orcid.org/0000-0001-6531-878X; http://lattes.cnpq.br/9720688699522760
    Mixing herbicides in the spray tank is a common practice among farmers to broaden the spectrum of activity and improve the management of herbicide-resistant weeds. However, information remains scarce regarding the potential spray-drift risks associated with this practice. This study aimed to evaluate spray drift as affected by herbicide mixtures and spray-nozzle type. Drift was measured in a wind tunnel, sampled at horizontal distances of 5, 10, and 15 m from the nozzle and at heights of 0.3, 0.5, 0.7, 0.9, and 1.1 m above the tunnel floor. The tested mixtures were glyphosate + 2,4-D; glyphosate + 2,4-D + saflufenacil + adjuvant; glyphosate + chlorimuron; and glyphosate + carfentrazone, applied using two nozzle types: pre-orifice flat-fan (ADI 11002, at 227 kPa) and air-induction flat-fan (AVI 110015, at 310 kPa). Results indicate that drift depends on both herbicide composition and nozzle model. The glyphosate + chlorimuron mixture produced the highest drift at the 10 and 15 m sampling distances when applied through the AVI 110015 nozzle (310 kPa). In contrast, the glyphosate + carfentrazone mixture consistently showed the lowest drift across all sampling distances, regardless of nozzle (AVI 110015 at 310 kPa or ADI 11002 at 227 kPa). It is concluded that spray drift is governed by the interaction between herbicide mixture and nozzle selection.