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Item Food security in Sri Lanka - agronomic implications and potentials(National Science Foundation:Colombo, 2008-11) Sangakkara, U.R.; Nissanka, S.P.Item Effects of plant density, nitrogen and gypsum on yield parameters of groundnut (Arachis hypogea L.) in regosols of Batticaloa district(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1995) Sivanesarajah, K.; Sangakkara, U.R.; Sandanam, S.