Abstract

                                A field investigation was carried out at Agricultural Research Station, Bhavanisagar of Tamil Nadu Agricultural University, during kharif 2009 and 2010 to evaluate the new formulation of oxyfluorfen (23.5% EC) on weed control in onion and their residual effect on succeeding crops. Based on two years field experimentation, it was found that pre-emergence application of oxyfluorfen (23.5% EC) at 400 g ha-1 gave significantly lower total weed density, weed dry weight and higher weed control efficiency at all the stages. Application of new formulation of oxyfluorfen (23.5% EC) at 200 g ha -1 as pre-emergence herbicide kept the weed density and dry weight below the economic threshold level and increased the bulb yield (15940 and 15610 kg ha -1 ) in onion. Succeeding crops like sunflower and pearl millet sown immediately after the harvest of onion was not affected by the residue of new formulation of oxyfluorfen at all different doses.

Key words : weed density, weed control efficiency, yield, succeeding crops.