Efficacy of oxadiargyl on cotton under Gezira, Sudan
2012
Ibrahim, N.E., Agricultural Research corporation, Gezira Research Station, Wad Medani, (Sudan) | Babujerm A.G.T., Sudan University for Sciesnce and Technology, Khartoum, (Sudan) | Hamada, A.A., Agricultural Research corporation, Gezira Research Station, Wad Medani, (Sudan)
Field and green house experiments were conducted at the Gezira Research Station (GRS) to evaluate herbicidal efficacy of oxadiargyl on cotton and the effects of rain simulation on its toxicity, as compared to some other herbicides commonly used for weed control on cotton. Oxadiargyl at 0.15-0.30 kg a. i./fed, and its tank mixtures with diuron effected good to excellent (78-91%) weed control early in the season. However, late season weed control was moderate to good (57-74%). The standard oxadiazon and diuron tank mix displayed moderate weed control (58 and 59%) throughout the season. Early in the season oxadiargyl, alone, effected excellent control (100%) of the dominant weeds, except Commelina kotschyi and Aristolochia bracteolata. The tank mix of oxadiargyl and diuron adequately controlled C. kotschyi, but not A. bracteolata. Following frequent rains oxadiargyl displayed high toxicity to cotton. The herbicide significantly reduced leaf area index (LAI), crop stand and height. However, recovery occurred late in the season. At harvest all herbicide treatments out yielded the unweeded control, but were out yielded by the hand weeded check. Simulated rain enhanced toxicity of oxadiargyl, oxyfluorfen and oxadiazon. However, toxicity of fluomeuron and metolachlor mix, and pendimethalin was less affected. It was concluded that the influence of simulated rain on selectivity of the herbicides to cotton, was modulated by growth stage, route of entry into the plant and by mode of action. Fluometuron and metalochlor mix and pendimethalin may be used safely for weed control on cotton in both the irrigated and rain fed sectors. Oxadiazon and oxyfluorfen are more suitable on furrow irrigated cotton where rainfall is less frequent. Use of oxadiargyl must be restricted to irrigated areas where rainfall does not coincide with cotton emergence
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