Abstract
The efficacy of various herbicides against weeds of maize was studied in field trials at Ibadan, Nigeria in 2003 and 2004. The formulations were atrazine (Gesaprim® 90 WDG at 3.5 kg a.i. ha−1 and Rhonazine® 80 WP at 3.0 kg a.i. ha−1), a mixture of atrazine and metolachlor (Primextra® Gold™ 660 SC at 4.0 kg a.i. ha−1 and Primextra® 500 FW at 2.5 kg a.i. ha−1), and a mixture of mesotrione, S-metolachlor and atrazine (Lumax® at five rates: 1.88–2.96 kg a.i. ha−1). Unweeded and hoe-weeded treatments were controls. Lumax® at all rates, Rhonazine® at 3.0 kg a.i. ha−1, and Primextra® at 2.5 kg a.i. ha−1 controlled sedges, Commelina benghalensis, and Pueraria phaseoloides as effectively as the weeded control (95–100%). Weed density and biomass were significantly reduced and maize yield increased by 12–22%. The highest yield was in treatments with 2.15 − 2.96 kg a.i. ha−1 of Lumax® and 3.5 kg a.i. ha−1 of Gesaprim®, and the weeded control. Lumax® is more effective for weed control at lower rates than the previously used formulations.
Published Version
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