Bio-Efficacy of Imazethapyr in Rainfed Greengram [Vigna radiata (L.) Wilczek]

Abstract

A field experiment was conducted during kharif season of 2012 and 2013 in deep black soil at Main Agricultural Research Station Farm, University of Agricultural Sciences, Dharwad, Karnataka to find out the bio-efficacy of imazethapyr against weeds of greengram. Among the weed management treatments weed free check and standard check recorded significantly lower number weeds, total weed dry weight lower weed index. On the contrary these two treatments recorded higher weed control efficiency and total dry matter production of greengram. However, former treatments were remain on par with imazethapyr 10 % SL 750ml/ha + adjuvant @ 2.0ml/l by registering maximum reduction of weed population, weed dry weight (5.12 and 10.4g/m2 during 2012 and 2013, respectively) and the highest weed control efficiency (89.55 and 78.77 % during 2012 and 2013, respectively). Early post emergent application of imazethapyr applied at 10 % SL 750ml/ha + adjuvant @ 2.0ml/l recorded significantly higher plant height, LAI, total dry matter production and number of pods per plant, number of seeds per pod, seed and haulm yield. This was closely followed by the treatment with imazethapyr 10 % SL 750ml/ha. Weedy check treatment produced lowest yield of greengram.