Influence of different herbicides on weed flora of Berseem (Trifolium alexandrinum L.)

Abstract

A field experiment was conducted at Research cum Instructional Farm, IGKV, Raipur (C.G.) during rabi 2019-20 to know the influence of different herbicides on weed flora of berseem (Trifolium alexandrinum L.). The experiment was laid out in a Randomized Block Design with three replications of ten treatments viz. pendimethalin (PE) 1000 g/ha (T1), pendimethalin (EPoE) at 10 DAS 1000 g/ha (T2), oxyfluorfen (PE) 250 g/ha (T3) imazethapyr (PoE) 40 g/ha just after 1st cutting (T4), imazethapyr (PoE) 40 g/ha just after 2nd cutting (T5), imazethapyr (PoE) 40 g/ha just after 1st and 2nd cutting (T6), imazamox 35% + imazethapyr 35% (ready mix) (PoE) 70 g/ha just after 1st cutting (T7), imazamox 35% + imazethapyr 35% (ready mix) (PoE) 70 g/ha just after 2nd cutting (T8), sodium acifluorfen 16.5% + clodinafop-propargyl 8% (ready mix) (PoE) 187.5 g/ha just after 1st cutting (T9) and control (T10).The soil of experimental field was clayey in texture and slightly alkaline with (pH 7.4) in reaction. The amount of available N, P and K were low, medium and high respectively. Among these treatments, at 20 DAS and before 1st cutting of berseem the density and dry weight of weeds were found significantly lowest under the treatment oxyfluorfen 250 g/ha applied as PE (T3). However, before 2nd cutting and at harvest of berseem the density and dry weight of weeds were found significantly lowest under sodium acifluorfen 16.5% + clodinafop-propargyl 8% as PoE applied just after 1st cutting (T9).With regards to total weed density it was found at par with the PE application of oxyfluorfen 250 g/ha(T3). But it was also found phytotoxic effect on berseem crop up to 15-20 DAA, hence negative impact on the growth and yield of berseem plants was observed.