Abstract

Field experiments were set up in three ecological zones of southwestern Nigeria to evaluate the effectiveness of Atoll® (atrazine + isoxaflutole), a new herbicide mixture, for weed control in maize. Crop i njury rating indicated pronounced phytotoxic effect on crops from 1.34 to 1.61 kg a.i. ha-1 Atoll in all locations. Acceptable weed control was realized in Atoll treatments except for 0.54 kg a.i. ha-1 at Ilorin and Orin-Ekiti. Atoll treatments in Ilorin and Orin-Ekiti controlled weeds more effectively than atrazine soluble concentrate (SC) and atrazine wettable powder (WP). Average yield across the locations was highest in 0.81 kg a.i. ha-1 Atoll. Yield losses in weedy checks compared to 0.81 kg a.i. ha-1 Atoll ranged between 18.8 and 67.3 per cent in the three locations. Des experiences de terrain ont ete menees dans trois zones ecologiques du Sud-ouest du Nigeria pour evaluer l'efficacite de l'Atoll (atrazine + isoxaflutole), preparation herbicide pour lutter contre la mauvaise herbe nuisible a la culture du mais. L'evaluation des degats causes aux recoltes a revele des effets phytotoxiqes prononces de l'ordre de 1.34 a 1.61 kg a. i. ha-1 Atoll dans tous les emplacements. Le traitement a base d'Atoll des cultures a donne des resultats acceptables a l'exception des emplacements comme Ilorin et Orin-Ekiti ou le taux a ete de 0.54 kg a.i. ha-1. A Ilorin et Orin-Ekiti les traitements a base d'Atoll ont ete plus efficaces que le concentre soluble d'atrazine (SC) et la poudre soluble d'atrazine (WP). La moyenne des recoltes la plus elevee a travers ces emplacements a ete verifiee a 0.81 kg a. i. ha-1 Atoll. Les pertes en recolte sur les surfaces dominees par les mauvaises herbes, par rapport a 0.81 kg a.i. ha-1 Atoll, ont varie entre 18.8 et 67.3 pour cent dans les trois emplacements. Ghana Journal of Agricultural Science Vol. 40 (2) 2008: pp. 193-198

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