Based on two years’ (2004–05 and 2005–06) field experimentation, it was found that chlorsulfuron 30 g/ha, metsulfuron 4 g/ha and triasulfuron 60 g/ha reduced the density of different broadleaf weeds in wheat to the extent of 90–100% and proved better than sulfosulfuron (20 and 25 g/ha) and 2, 4-D Na salt (500 and 750 g/ha). Weed control efficiency (WCE) against total broadleaf weeds based on average dry weight of two years due to chlorsulfuron 30 g/ha, metsulfuron 4 g/ha and triasulfuron 60 g/ha varied between 86–89%; however, triasulfuron 40 and 60 g/ha was at par in this respect. Effective tillers and grain yield of wheat were maximum in the plots kept weed free throughout the crop season; however, statistically it was at par with chlorsulfuron 30 g, triasulfuron 40 and 60 g and metsulfuron 4 g/ha during both the years. Weeds growing throughout the crop season reduced the grain yield to the extent of 46 and 40% during 2004–05 and 2005–06, respectively. Plant height of succeeding crop of sorghum at 45 DAS was significantly reduced by triasulfuron 60 g/ha both under prepared and unprepared field conditions and also by sulfosulfuron 25 g/ha only under unprepared field situation. Similarly, fresh weight of sorghum under prepared field situation at 45 DAS during both the years and fodder yield at harvest during 2004–05 only were significantly reduced due to residual toxicity of triasulfuron 60 g/ha applied in wheat.
Broad-spectrum weed control, herbicide residue, crop safety
