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The field experiment was conducted during kharif season of the year 2013-2014 on red lateritic soil of the Education-cum-experimental Farm, Department of Agronomy, College of Agriculture, Dapoli, Ratnagiri (M.S.) to study effect of Long term herbicide trial in Rice-Ground-nut cropping systems. The study reveals that weed growth of monocots reduced significantly due to weed free check as compared to all other weed control measures during the year 2014 and 2015. While during the year 2012 weed free check remained at par with fixed and rotational herbicide and in pooled results with fixed herbicide. Among the herbicide tried fixed herbicide recorded least growth of monocots and BLWs as compared to rotational herbicide. In respect of growth of BLWS at harvest, weed free check (2HW) remained at par with fixed herbicide and recorded significantly lowest weed growth during the year 2012 and in pooled results. However weed free check reduced significantly weed growth of BLWS during the years 2013, 2014 and 2015 over all other weed control measures tried. The highest weed control efficiency was recorded under weed free check followed by fixed herbicide and rotational herbicide during individual years and in pooled results. Interaction effects both green manuring and weed control measures on weed growth was found to be non significant. Rice equivalent yield of groundnut and REY of system did not influenced significantly due to green manuring. However, green manuring recorded higher rice equivalent yield of groundnut (134.66) and REY (178.44) of system than without green manuring.
Keywords: Rice-Ground cropping System, Different herbicides, Weed growth, Yield attributing characters, Yields and chemical composition.