Efficacy of different post-emergence herbicides against complex weed flora in greengram

A field experiment was conducted for three consecutive years (2021-23) at Agricultural Research Sub-Station, Nagaur, Agriculture University, Jodhpur during rainy season to evaluate the efficacy of different post-emergence herbicides for complex weed flora, growth and yield of greengram with twelve treatments laid out in randomized block design with three replications. The results revealed that post-emergence application of imazethapyr 50 g/ha significantly controlled grassy and broad-leaves weeds, but its efficacy was low against Rhinchosia minima and Cyprus rotundus. The significant lowest weed density (No./m2) of different weeds like Rhinchosia minima (15.3), Digera arvensis (6.0), Celosia argentea (16.0), Cyperus rotundus (8.0), Dactyloctenium aegyptium (6.0), other broad-leaves and grassy weeds (5.3), total weed dry weight (27.0 g/m2) and weed control efficiency (82.9 %) were recorded under fomesafen 11.1% w/w + fluazip-p-butyl 11.1% followed by sodium acifluorfen + clodinafop-propargyl 220 g/ha. Similar treatments resulted in significant improvement in number of seeds per pod (13.4), grain yield (1.22 t/ha), net returns (₹ 70,310/ha) and B-C ratio (2.1) and weed index (9.0%). The findings of this experiment endorse the application of either fomesafen 11.1%w/w + fluazip-p-butyl 11.1% (readymix) or sodium acifluorfen + clodinafop-propargyl 220 g/ha at 20-25 days after sowing to realized excellent control of complex weed flora in greengram consequently resulting in higher grain yields, net returns and B-C ratio.