G.P.SahaKamlesh Kumar Singh2024-07-112024-07-112000https://krishikosh.egranth.ac.in/handle/1/5810211784In order to study the efficacy of herbicides in transplanted rice (IR 36), an experiment was conducted in the Eastern section of the Ranchi Agricultural College Farm, Kanke, Ranchi during Kharif season (July-November 1999). The experiment was laid out in randomized block design. The treatments included five different herbicides viz. Butachlor, anilofos, oxyfluorfen, pendimethalin and benthlocarb applied alone and their five combinations with 2,4-D, single and twice hand weeding’s and a weedy check. Thus, there were thirteen treatments which were replicated thrice. The soil of the experimental plot was sandy clay loarn in texture, low to medium in fertility status and slightly acidic in reaction. The results revealed that among all the treatments, it was two hand weedings which recorded maximum grain yield (45.45 q ha''), straw yield (55.55 q ha') and gross return (Rs.23,092.95 ha). Amongst the remaining treatments, only butachlor + 2,4-D and benthiocarb + 2,4-D did not differ significantly from hand weeding twice in reducing weed population and weed dry weight and in enhancing growth, most of the yield attributes and grain and straw yields and gross return of rice. However, so far economics is concerned, it was butachlor + 2,4-D which registered maximum net return (Rs.13,965.21 ha) and benefit: cost ratio (1.54). A close perusal of data on net return and benefit cost ratio clearly indicated that only benthiocarb + 2,4-D and butachlor were comparable to butachlor + 2,4-D In enhancing net return, while the treatments like anilofos + 2,4 D, benthiocarb + 2,4-D, butachlor and anilofos were as effective as butachlor + 2,4 D with respect to increase in benefit: cost ratio. Hence, the above results clearly indicated that under the existing soil and fertility condition the weed control measures like butachlor + 2,4-D, benthiocarb + 2,4-D, anilofos + 2,4-D and butachlor might be adopted from both productivity and profitability point of view. Moreover, this is the result of a single year and therefore, for the confirmation of the result, the investigation needs to be repeated.EnglishThesis