Efficacy of herbicides applied alone and in tank mixture with isoproturon against wild oat (Avena ludoviciana) and broad leaf weeds in wheat (T ticum aestivum)

Abstract

An investigation was conducted during winter seasons of 1996 97 and 1997 98 at Gurdaspur, Punjab, on fields heavily infested with broad leaf of weeds. An application of metribuzin (0.175 kg/ha) or pendimethalin (0.7 kg/ha) alone or tank mixture of isoproturon metribuzin (0.75 0.1 31 kglha), isoproturon atrazine (0.75 0.094 kglha) or isoproturon 2, 4 D (0.94 0 5 kg/ha) provided effective control of broad leaf weeds in wheat (Triticum aestivum L. emend. Fiori Paol.) Application of 2, 4 D or diclofopmethyl/tralkoxydim alone was not effective against broad leaf weeds, especially Medicago denticulata Willd., Lathyrus X aphaca L. and Vicia sativa L. However, diclofopme hyl or tralkoxydim alone in tank mixture with isoproturon effectively controlled wild oat. lsoproturon atrazine and isoproturon 2, 4 D recorded the lowest dry matter of weeds in the first and second year respectively. The maximum weed density and dry matter of weeds were recorded in weedy check. Application of metribuzin (0.175 kglha) resulted in the maximum grain yield which was at par with tank mix application of isoproturon metribuzin, isoproturon atrazine, isoproturon 2,443, isoproturon and pendimethalin, whereas weedy check resulted in the minimum grain yield. The maximum net returns were obtained with metribuzin (0.175 kglha) application, followed by isoproturon metribuzin. However, maximum benefit : cost ratio was registered with atrazine applied 0.094 kglha. Diclofopmethyl resulted in the lowest net returns and benefit : cost ratio.