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A field experiment was conducted during kharif (rainy) season of 2013 at Regional Agricultural Research Station, Lam, Guntur, India in randomized block design with three replications to study the effect of integrated weed management practices on yield and economics of pigeonpea. The weed free treatment significantly decreased the weed density, dry weight of weeds and also increased in weed control efficiency compared with weedy check. Integration of intercultivation at 50 days after sowing (DAS) with pendimethalin @0.75 kg a.i.ha-1 as pre-emergence (PE) or imazethapyr @ 100 g a.i.ha-1 as post-emergence (POE) at 10-15 DAS or pendimethalin@0.75 kg a.i. ha-1 as PE followed by imazethapyr @ 100 g a.i. ha-1 as POE at 10-15 DAS proved effective in reducing total weed density and dry weights of weeds and also increased in weed control efficiency compared with weedy check. The maximum growth parameters, yield components, grain yield and B:C ratio recorded under weed free situation were comparable with that obtained from integration of herbicides, pendimethalin @0.75 kg a.i. ha-1 PE and imazethapyr @ 100 g a.i.ha-1 POE at 15-20 DAS with intercultivation at 50 DAS.

Key words: Pigeonpea, IWM, Weeds, Intercultivation, B:C ratio.