Evaluation of dual gold 96% EC(S-metolachlor) alone or in mixture with atrazine for preemergence weed control in sorghum
2006
Mubarak, H.A., Agricultural Research Corporation, Wad Medani (Sudan) | Dawoud, D.A., Agricultural Research Corporation, Wad Medani (Sudan) | Abdel-Aaziz, E., Agricultural Research Corporation, Wad Medani (Sudan) | Babiker, A.T., Agricultural Research Corporation, Wad Medani (Sudan) | Hamada, A.A., Agricultural Research Corporation, Wad Medani (Sudan)
Weeds, particularly grassy species are one of the main constraints to sorghum production. The objective of this study was to evaluate the efficacy and selectivity of Dual Gold 96%EC (S-Metolachlor) with or without safener (Concep III 960 ES at 400µl and 7.5 ml water/kg seed) for preemergence weed control in sorghum. Four experiments were undertaken at Gezira Research Farm on 2002/03-2005/06 seasons. Dual Gold alone at all rates, in safened or unsafened seeds, irrespective of supplementary weeding gave satisfactory to excellent control of grasses (65-100%) and poor to satisfactory control of broad-leaved weeds (0-66%) throughout the seasons. Dual Gold at all rates in mixture with atrazine, irrespective of supplementary weeding attained moderate to excellent control of grasses throughout the season (50-97%) and good to excellent (73-98%) and moderate to excellent control of broad-leaved weeds (50-100%) early and late in the season, respectively, during the whole seasons. All herbicides treatments inconsistently reduced weed biomass by 6-83% in comparison with the unweeded control throughout the seasons. Dual Gold at all rates, alone or in mixture with atrazine, with unsafened seeds had significant effects on sorghum plant population in the first season and when it was applied with safened seeds had no phytotoxic effects on plant population in the second, third and fourth season. Dual Gold at all rates alone or in mixture with atrazine with safened seeds outyielded the unweeded control by 20-38% throughout the seasons and attained yield comparable to that of the weeded control
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