Bulletin of the Rubber Research Institute of Sri Lanka

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Future trends and policies in soil-plant studies
(Rubber Research Institute of Sri Lanka. Agalawatta, 1993) Yogaratnam, N.
Environmental friendly disease control systems
(Rubber Research Institute of Sri Lanka. Agalawatta, 1998) Jayasuriya, K.E.
Eppawela rock phosphate as a source of phosphorus for rubber
(Rubber Research Institute of Sri Lanka. Agalawatte, 1987) Yogaratnam, N.; De Mel, G