Economics of Herbicides against Weeds of Black Gram (Vigna mungo (L). Hepper) Under Irrigated Condition

Field experiment was conducted at Agricultural College and Research Institute, Killikulam during Purattasipattam (September 2017 – November 2017) to evaluate the economics of herbicides against weeds of black gram under irrigated condition. Twelve treatments were tested in randomized block design with three replications. Among the weed control treatments, PE application of oxyfluorfen @ 0.18 kg a.i ha-1 + EPOE application of Imazethapyr @ 0.05 kg a.i ha-1 on 20 DAS recorded significantly lower total weed density (22.92 m2) and higher weed control efficiency (93.2 %) than rest of the treatments including weedy check. The significantly higher grain (743 kg ha-1) and haulm (2380 kg ha-1) yield was recorded in weed free plot over all the treatments, which was followed by PE application of oxyfluorfen @ 0.18 kg a.i ha-1 + EPOE application of Imazethapyr @ 0.05 kg a.i ha-1 on 20 DAS (722 and 2314 kg ha-1). However, the maximum net return of Rs.28832 ha-1 and B:C ratio (2.26) was found with PE application of oxyfluorfen @ 0.18 kg a.i ha-1 + EPOE application of Imazethapyr @ 0.05 kg a.i ha-1 on 20 DAS followed by PE application of pendimethalin @ 1.0 kg a.i ha-1 + EPOE Imazethapyr @ 0.05 kg a.i ha-1 on 20 DAS (Rs.27210 ha-1 and 2.18).