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 imazethapyr (10% SL) on weed control in groundnut and its residual effect on succeeding crops. Based on two years field experimentation, it was found that early post emergence application of imazethapyr (10% SL) at 200 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 imazethapyr (10% SL) at 100 g ha-1 as early post emergence herbicide kept the weed density and dry weight below the economic threshold level and increased the pod yield (1602 and 1900 kg ha-1) and this was on par with 150 g ha-1 (1580 and 1854 kg ha-1) in groundnut. Succeeding crops like sunflower and pearl millet sown immediately after the harvest of groundnut was not affected by the residue of new formulation of imazethapyr at all different doses.

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