Eficácia de glyphosate na dessecação de braquiárias em dois níveis de biomassa

Paulo César Timossi; Dieimisson Paulo Almeida; Andréia Rodrigues Ramos; Patrícia Aparecida de Carvalho Felisberto; Suzete Fernandes Lima; Uadson Ramos Silva

doi:10.7824/rbh.v15i4.490

Authors

Paulo César Timossi UNIVERSISDADE FEDERAL DE GOIÁS - REGIONAL JATAÍ
Dieimisson Paulo Almeida Eng. Agr. Mestre em Agronomia – Doutorando em Agronomia/Produção Vegetal na UNESP – Câmpus de Jaboticabal, Jaboticabal, SP. Depto. Fitossanidade, CEP: 14.884-900.
Andréia Rodrigues Ramos Eng. Agr. Mestre em Agronomia – Doutorando em Agronomia/Agricultura na UNESP – Câmpus de Botucatu, Botucatu, SP. Depto. de Produção Vegetal, CEP: 18610-307.
Patrícia Aparecida de Carvalho Felisberto Eng. Agr. Mestre em Agronomia – Doutoranda em Agronomia/Produção Vegetal na UNESP – Câmpus de Jaboticabal, Jaboticabal, SP. Depto. Fitossanidade, CEP: 14.884-900.
Suzete Fernandes Lima Eng. Agr. Mestre em Agronomia, Doutoranda em Ciências Agrárias/Agronomia no IFGoiano – Campus Rio Verde, Rio Verde, GO, Brasil.
Uadson Ramos Silva Secretário de agricultura de Itarumã - GO

DOI:

https://doi.org/10.7824/rbh.v15i4.490

Keywords:

chemical control, herbicides, vegetation cover, Urochloa sp.

Abstract

The objective of this research was to evaluate the efficacy of glyphosate in desiccating Urochloa ruziziensis, U. decumbens, and U. brizantha cv. Piatã at two levels of biomass for no-till establishment in Cerrado areas. The experimental design was a randomized complete block design with four replications, in a split-plot system. Plots consisted of two levels of biomass and sub-plots consisted of four doses of Roundup Ultra^® - glyphosate at 0.65; 1.30, 1.95 and 2.60 kg ha^-1 acid equivalent. The application was performed using custom pressurized CO₂ sprayer at the constant pressure of 210 kPa bar equipped with eight nozzles with TT110015, spaced at 0.5 m, and spray solution volume equivalent to 100 liters h^-1. The assessments were based on the percentage of control of plant mass, performed on day 10, 15 and 20 after application. It is possible to conclude that U. ruziziensis is more sensitive to glyphosate than the other studied species and biomass levels influence doses to be given only for U. decumbens and U. brizantha cv. Piatã.