Author(s): K. R. K. NAIDU, A. V. RAMANA AND B. DE

Abstract: A field experiment was conducted during rabi 2009-10 at the Agricultural College Farm, Naira of Acharya N. G. Ranga Agricultural University to study the efficacy and economics of different pre- and post-emergence herbicides in rice-fallow blackgram. Density and dry weight of weeds were significantly reduced by hand weeding compared to other treatments and was at par with imazethapyr @200 g a.i. ha-1. All other herbicides except, quizalofop-p-ethyl @ 50 and 75 g a.i. ha-1 significantly reduced the density and dry weight of weeds compared to un-weeded check. Imazethapyr at both the doses showed phyto-toxicity on blackgram. At lower dose the crop recovered quickly while, at higher dose no such recovery was noticed. Hand weeding was significantly superior to other treatments in respect of crop dry matter accumulation, yield attributes and yield of crop. However, on considering economics, pendimethalin @ 1.0 kg a.i. ha-1 was found to be a cost effective method.

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