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Item Some hydrological aspects of the Knuckles region(National Resources, Energy Science Authority of Sri Lanka:Colombo, 1990) Bandaratillake, H.M.Item Future trends and policies in soil-plant studies(Rubber Research Institute of Sri Lanka. Agalawatta, 1993) Yogaratnam, N.Item Environmental friendly disease control systems(Rubber Research Institute of Sri Lanka. Agalawatta, 1998) Jayasuriya, K.E.Item Fertilizer for rice(Central Agricultural Research Institute:Peradeniya, 1970) Thenabadu, M.W.Item Afforestation for protection and conservation in the up-country patanas(Forest Department:Colombo, 1957) De Rosayro, R.A.Item Some problems of under-planting(Coconut Research Scheme(Ceylon):Lunuwila, 1952) Rodrigo, R.B.; Rajapakse, G.; Jayasooriya, D.C.Item Fertilizer use in rubber(Soil Science Society of Sri Lanka:Peradeniya, 1985-86) Yogaratnam, N.Item Some possible causes for failures of young tea in new clearings(Tea Research Institute:Talawakele, 1987) Kathiravetpillai, A.Item Eppawela rock phosphate as a source of phosphorus for rubber(Rubber Research Institute of Sri Lanka. Agalawatte, 1987) Yogaratnam, N.; De Mel, GItem Fundamentals of plant mineral nutrition(National Resources, Energy Science Authority of Sri Lanka:Colombo, 1990) Samaraweera, M.K.S.A.