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Item Geoenvironmental assesment for nitrate pollution of ground water by fertilization in shiroishi plain in Japan(Soil Science Society of Sri Lanka:Colombo, 2002) Gunatilake, S.K.; Iwao, Y.; Gunatilake, J.; Kumaragamage, D.Item Site specific nutrient management in soils of Sri Lanka. a review of recent work using a systematic approach to formulate fertilizer recommendations for annual crops(Soil Science Society of Sri Lanka:Peradeniya, 2010) Kumaragamage, D.Item Fate of Diuron in selected Agricultural soils(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1998) Ratnayake, J.I.L.B.; Kumaragamage, D.Item An investigation on phosphate adsorption in six Sri Lankan soils in relation to their chemical and mineralogical properties(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1991) Jayawickrama, S.P.; Thenabadu, M.W.; Kumaragamage, D.Item Effect of neem (Azadirachta indica A. Juss) materials on nitrification of applied urea in three selected soils of Sri Lanka(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1998) Gnanaveirajah, N.; Kumaragamage, D.