Control of speargrass (Imperata cylindrica (L) Raeuschel) with glyphosate and fluazifop-butyl for soybean (Glycine max (L) Merr) production in savanna zone of Nigeria

• Published in: Journal of the science of food and agriculture Vol. 80; no. 2; pp. 193 - 196
• Main Author: Avav, T
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 15.01.2000; Wiley; Published for the Society of Chemical Industry by Elsevier Applied Science
• Subjects: Biological and medical sciences; Chemical control; fluazifop-butyl; Fundamental and applied biological sciences. Psychology; glyphosate; hoe-weeding; I cylindrica; Parasitic plants. Weeds; Phytopathology. Animal pests. Plant and forest protection; pre-tillage; savanna; soybean; Weeds; Nigeria; Africa; Performance evaluation; Weed control; Soil tillage; Weed; Savannah; Pesticides; Postemergence; Systemic; Hoeing; Experimental study; Glycine max; Glyphosate; Field experiment; Herbicide; Grain legume; Leguminosae; Aminoacid; Dicotyledones; Angiospermae; Spermatophyta; Application; Comparative study; Chemical weed control
• ISSN: 0022-5142; 1097-0010
• DOI: 10.1002/(SICI)1097-0010(20000115)80:2<193::AID-JSFA476>3.0.CO;2-M

A field trial was conducted in 1996 and 1997 to control speargrass (Imperata cylindrica (L) Raeuschel) for soybean production. The treatments comprised four levels of glyphosate, 1.08, 1.44, 1.80 and 2.16 kg ha−1, applied pre‐tillage and followed by one hoe‐weeding (HW) at 6 weeks after planting (WAP); fluazifop‐butyl, 0.125, 0.25 and 0.375 kg ha−1, at 3WAP; 1HW at 3WAP; 2HW at 3 and 6WAP; and an unweeded control. Glyphosate and fluazifop‐butyl controlled 57–85% and 51–83% respectively of I cylindrica compared with 64–67% by traditional hoe‐weeding. The highest grain yield (1.88 t ha−1) was obtained from plots treated with glyphosate (1.44 kg ha−1) + 1HW. The highest profit, however, was obtained with fluazifop‐butyl. It was unprofitable to apply glyphosate at rates higher than 1.44 kg ha−1 to control I cylindrica at 30 cm foliage. © 2000 Society of Chemical Industry