Enhancing herbicidal activity of glyphosate by adjuvants in mandrin orchards
2009
El-Sobki, A.E.A. | Omar, A.E.M. | Aamir, M.M.I. | El-Fishawi, A.A.
Field experiments were conducted during 2006 and 2007 seasons at Bielbis Farm, Sharkia Governorate to evaluate the effectiveness of certain adjuvants namely Silwet L-77, 7 ween 80 and Iamadoul A /1000 on the efficacy of glyphosate commercial producted (Herbazed 48% WSC) for control of three broad-leaved weeds, (redroot -Pigweed.9maranthus retroflexus, common purslane Portulaca oleracea and knotweed Polygon um salicifolium) and to three grassy weeds, barnyard- weed Echinochloa crux gallia, jungle rice Echinochloa colon um, and forssk Dinebra retroflexa). Results indicated that glyphosate at recommended rate (1.2 kg a.i./fed.) decreased the fresh weight of broad - leaved, and grassy weeds as compared to unweeded (control) by more than 91.89 and 91.44% respectively in both seasons at 3 weeks after application. After 3 weeks post-treatment, the addition of Silwet L-77 either at 0.01 or 0.05% increased the efficacy of glyphosate at half of recommended rate (0.6 kg a.i./fed.) on broad-leaved weeds In both seasons. The addition of Tween 80 and Hamadoul A/1000 either at 0.01 or 0.05% to glyphosate at half recommended rate decreased fresh weight of broad-leaved and grassy weeds in both seasons at 3 weeks after application. The using of adjuvants, Silwet L-77, Tween 80 and Hamadoul A /1000 alone were uneffective on weeds at all treatments, Hand hoeing method significantly depressed weeds growth comparing to the unweeded one (control) in both seasons.
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