The experiment was carried out during Kharif 2001 at the Main Agricultural  Research Station, University of Agricultural Sciences Dharwad to study the effect of weed management practices on weed control efficiency, morpho-physiological and biochemical parameters in soybean and redgram (4:2 RP) intercropping system.  The experiment  consisted of five pre-emergence  herbicides viz., alachlor butachlor, pendimethalin, metolachlor, and oxadiazon as sole application and in combination with cultural practices (inter cultivation and hand weeding) along with weed free check and unweeded control.  The maximum weed control rating was recorded for metolachlor applied @ 1.0 kg ai/ha coupled with cultural pratices.   Among the herbicides metolachlor, oxadiazon and alachlor recorded higher plant height, chlorophyll content and photosynthetic rate.  The higher soybean and redgram yields were noticed with metolachlor, oxadiozon, alachlor  treatments in combination with cultural pratices and weed free check.  However the B:C ratio was highest in metolachlor  coupled with cultural practices.