Comparison of diuron and butachlor for weed control in okra
Keywords:
screening of herbicides, okra establishment, weed management, shoot biomassAbstract
Okra (Abelmoschus esculentus (L.) Moench) yields are decreased by weed interference. Manual weeding is mostly used in okra productivity and it is associated with high cost and drudgery, different from what obtains in the use of herbicides. Herbicides identified for weed management in okra productivity are small in number and scarce. The objective of this experiment is to compare development and tolerance of okra to the two frequently used herbicides. Diuron and butachlor were tested each at 2.0 kg a.i./ha and screened for okra tolerance and weed control efficacy. Un-weeded plots (WDC) and Hoe-Weeded (HWC) served as controls. Collected data were statistically analysed. Level of okra establishment followed the order of 91.8% (HWC)> 89.0% (butachlor)> 86.8% (WDC) > 51.9% (diuron). Diuron at 3.6 kg was not safe on okra it was severely phytotoxic (7.8), on 0-10 scale. Butachlor at 2.0kg a.i./ha was not phytotoxic on okra. Okra grown in butachlor plots had mean shoot biomass of 7.4g/plant which was similar to what was obtained in HWC, 7.9g/plant and was greater than 1.4g/plant in plots sprayed diuron. Diuron and butachlor had good weed control efficacy which were better than WDC. Okra had greater tolerance for butachlor which had no phytotoxic effect on okra at 2.0 kg a.i./ ha and had shoot biomass and okra establishment similar to what was obtained in HWC and should be among the herbicides considered for weed management in okra plots.
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References
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