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Item Prediction of the effects of soil water stress on grain yield and radiation use efficiency of rice (Oryza sativa L.) using a simulation model(National Science Foundation:Colombo, 1998) De Costa, W.A.J.M.Item Effects of water stress on nitrogen fixation of common bean (Phaseolus vulgaris L.)(NARESA:Colombo, 1997) De Costa, W.A.J.M.; Becher, M.; Schubert, S.Item Effect of potassium and water availability on water use efficiency of common bean (Phaseolus vulgaris L.)(NSF:Colombo, 1997) De Costa, W.A.J.M.; Liyanage, L.P.