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Article Info Field experiment was conducted during rabi 2015 at Tamil Nadu agricultural university, AC & RI, Madurai to study yield and economics of irrigated blackgram under lay by method of pre-emergence herbicide application. Results indicated that lay by method were found to superior to individual application with respect to weed control. Among the lay by treatments pre emergence application of pendimethalin at 1.0 kg ha -1 on 3 DAS followed by hand weeding on 20 DAS and sand mixdoi:10.20546/ijcrar.2017.508.004 fatcat:owwwg2q6cfeetnpel7e6p2x2ku