A.J. Ibrahim1*, A.A. Jimin2

1Department of Agronomy, Faculty of Agriculture, Federal University of Lafia, Nasarawa State, P.M.B 146, Lafia, Nigeria
2Department of Crop and Environmental Protection, Joseph Sarwuan Tarka University, Makurdi, Nigeria

(Manuscript received 25 August 2022; accepted for publication 21 February 2023)

Abstract. A field experiment was conducted in 2018 and 2019 in Lafia, Nigeria to determine the effects of single and tank-mix of seven selected herbicides (bispyribac-sodium; cyhalofop-butyl; penoxsulam; pendimenthalin; propanil; thiobencarb) and their mixtures in lowland rice (Oryza sativa L.). Rice grain yield following the single application of bispyribac-sodium post emergence (POST), cyhalofop-butyl POST and penoxsulam POST averaged 30% and 47% greater than the nontreated control in 2018 and 2019, respectively. The application of cyhalofop-butyl plus bispyribac-sodium or thiobencarb plus bispyribac-sodium POST reduced weed density over nontreated control, ranging 98 to 100% in 2018 compared to 88 – 91% reduction in weed density achieved with the application of cyhalofop-butyl alone and the sequential application of PRE pendimenthalin fb POST propanil. Bispyribac-sodium plus cyhalofop-butyl application resulted in the highest rice yield (5.13 and 5.60 t.ha−1) in 2018 and 2019, respectively. Mixtures of bispyribac–sodium with chyhalofop-butyl showed no injury on rice, whereas increased efficacy on weed control as compared with the single application of bispyribac–sodium. We recommend bispyribac-sodium and tank-mixed combination with cyhalofop-butyl to provide a broad spectrum of weed control in lowland rice system in Nigeria.