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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 Effect of two different water regimes on growth and yield of different groundnut (Arachis hypogaea L.) genotypes in Sri Lanka(2001) De Costa, W.A.J.M.; Nayakarathne, N.M.R.S.Item Evaluation of a climate change-adaptive, eco-friendly agronomic package for potato (solanum tuberosum l.) cultivation in the farmer fields of the Jaffna district of Sri Lanka(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2015) Eeswaran, R.; De Costa, W.A.J.M.; De Costa, D.M.; Dandeniya, W.S.; Sivakumar, S.; Suriyagoda, L.D.B.Item Impact of different latex harvesting systems adopted by some growers on economic performance(Rubber Research Institute:Agalawatta, 2017) Silva, T.U.K.; Senevirathna, A.M.W.K.; Seneviratne, P.; De Costa, W.A.J.M.; Subasinghe, H.Item Adaptation of agricultural crop production to climate change:A policy framework for Sri Lanka(NSF:Colombo, 2010-06) De Costa, W.A.J.M.