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Item Weed Management by rice straw mulching in direct seeded lowland rice (Oryza sativa L.)(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2011) Devasinghe, D.A.U.D.; Premarathne, K.P.; Sangakkara, U.R.Item Effective weed -free period of common beans in two different agro -ecological zones of Sri Lanka(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1999) Premalal, K.P.S.B.; Sangakkara, U.R.; Van Damme, P.; Bulcke, R.Item Competitive performance of purple nutsedge (Cyperus rotundus L.) and onion (Allium cepa L.) as affected by different sources of Nitrogen(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2012) Geretharan, T.; Sangakkara, U.R.; Arulnandhy, V.Item Competitive performance of purple nutsedge (Cyperus rotundus L.) and onion (Allium cepa L.) as affected by different sources of Nitrogen(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2012) Geretharan, T.; Sangakkara, U.R.; Arulnandhy, V.