Application of glyphosate in combination with imidazolinones or chlorimuron for control of purple nutsedge (Cyperus rotundus) in soybean (Glycine max)
1995
Wachira Faijaroenmongkol
Efficacy of glyphosate at 750 and 1,500 g/ha alone and in tank-mixed combination with imazapyr at 10 and 20 g/ha, imazaquin at 140 and 280 g/ha, imazethapyr at 100 and 125 g/ha and chlorimuron at 9 and 12 g/ha in soybean (Glycine max L. Merr., SJ.4) was evaluated at Khamphaengsaen campus, Nakornpratom and Bangkhen campus, Bangkok, Kasetsart University during 1991-1994. High rate glyphosate combined with high rate chlorimuron gave a good control of purple nutsedge (Cyperus rotundus L.) and other weeds. The combination of imidazolinones or chlorimuron combined with high rate glyphosate gave better performance compared with those combined with paraquat at 500 g/ha, particularly, high rate glyphosate-chlorimuron (1,500+12 g/ha) combination provided excellent control. Purple nutsedge at 7-14 days after emergence was found to be most susceptable to herbicide. Foliar-application of those combination herbicides gave better control of purple nutsedge than soil-application, especially, the combination of high rate glyposate with high rate chlorimuron. Application of imidazolinones or chlorimuron on same day with glyphosate or at 7 days before glyphosate gave a good control of purple nutsedge. The translocation of herbicides from daugther nutsedge plant to the mother were more than from mother plants to the daugther, especially, with high rate glyphosate in combination with high rate chlorimuron (1,500+12 g/ha) or imazaquin (1,500+280 g/ha). Application of imidazolinones or hlorimuron applied immidiatly after planting gave excellent weed control and without phytotoxicity of soybean.
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