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Item Physiological responses for moisture stress and development of an index for screening coconut (Cocos nucifera L.) genotypes for drought tolerance(Faculty of Agriculture-University of Ruhuna. Kamburupitiya, 2006) Lakmini. W.G.D.; Nainanayake, N.P.A.D.; De Costa, W.A.J.M.Item Effects of irrigation at different growth stages on yield components and yield of Soybean (Glycine max(L.) Merr.) grown in the low country dry zone of Sri Lanka(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1996) Shunmugathasan, K.N.; De Costa, W.A.J.M.; Joseph, K.D.S.MItem Decomposition and nutrient loss from prunings of different contour hedgerow species in tea plantations in the sloping highlands of Sri Lanka(2001) De Costa, W.A.J.M.; Atapattu, A.M.L.K.Item Evaluation of different genotypes of tomato under well watered and water stressed conditions on the basis of yield and some selected physiological parameters(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2003) Weerasinghe, O.R.; De Costa, W.A.J.M.; Perera, A.L.T.Item Factors responsible for productivity of food legumes. findings of a farmer survey in the Kurunegala district, Sri Lanka(Faculty of Agriculture, University of Ruhuna. Kamburupitiya, 1998) Hettiarachchi, M.P.; De Costa, W.A.J.M.; Jayasekera, S.J.B.A.Item Varietal variation in stmatal conductance, transpiration and photosynthesis of commercial sugarcane varieties under two con-trasting water regimes(University of Ruhuna. Matara, 2009) De Silva, A.L.C.; De Costa, W.A.J.M.Item Varietal variation in growth, physiology and yield of sugarcane under two contrasting water regimes(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2004) De Silva, A.L.C.; De Costa, W.A.J.M.Item Screening of a selected set of rice varieties for salinity tolerance in two phases of salt stress development (Abstract)(2009) Dharmasena, A.W.T.D.; De Costa, W.A.J.M.Item Effects of shade and water stress on growth and related physiological parameters of the seedlings of five forest tree species(National Science Foundation:Colombo, 2000) De Costa, W.A.J.M.; Rozana, M.F.Item Screening of rice varieties for tolerance to higher salinity(2010) Gunarathne, S.M.C.J.; De Costa, W.A.J.M.