Response of Different Fertility Levels and Pre-Emergence Herbicides on Weed Population and Benefit Cost Ratio of Colocasia (Colocasia esculenta Var. antiquorum)

Abstract

The field experiment was conducted during the year 2017 under All India Co-ordinated Research Project on Tuber Crops at S.G. College of Agriculture and Research Station, Jagdalpur, IGKV, Raipur (C.G.). The experiment was laid out in split plot design with two factors namely fertility levels and different pre-emergence herbicides with three replications. The result revealed that weed species, weed population and dry weight of weed were recorded significantly maximum under F 5 (130% NPK) followed by under F 4 (115% NPK), weed control efficiency were not affected by any fertility levels treatment. In case of application of pre-emergence herbicides whereas the weed species, weed density and dry weight of weed were significantly higher in T 6 (weedy check) whereas, weed control efficiency was recorded significantly higher in T 2 (Pendimethalin @ 1.5 kg a.i. ha -1 ) at 30 and 60 DAP. However, net returns and benefit cost ratio was recorded significantly maximum under F 5 (130% NPK) followed by F 4 (115% NPK) and minimum was observed under F 1 (70% NPK) in fertility levels. In case of pre-emergence herbicides recorded significantly higher under T 2 (Pendimethalin @ 1.5 kg a.i. ha -1 ) and lowest was observed under T 6 (weedy check). K e y w o r d sColocasia, Fertility levels and pre-emergence herbicides, Weed flora studies, Weed control and economics