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.

Keywords: weed density, weed control efficiency, yield, succeeding crops.