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Item Effect of purple nutsedge(Cyperus rotundus) population densities on onion(Allium cepa) as influenced by Nitrogen in the Eastern Province of Sri Lanka(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2011) 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.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.