Browsing by Author "Peries, O.S."
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Item Biological control of the diseses of the Hevea rubber tree(1984) Peries, O.S.; Liyanage, A.de S.Item Chemicals used in the raw rubber manufacturing industry(1985) Peries, O.S.; Liyanage, A. de S.Item Chemicals used in the rubber growing industry as fertilizers and herbicides(1984) Peries, O.S.; Liyanage, A. de S.Item A comparative study of the nutrition of Phytophthora meadii and P. palmivora(Rubber Research Institute. Colombo, 1979) Peries, O.S.; Liyanage, A.De.S.; Dantanarayana, D.M.Item The control of white root disease in Sri Lanka(Rubber Research Institute. Agalawatta, 1973) Liyanage, G.W.; Peries, O.S.Item The degree and importance of pollution caused by the raw rubber manufacturing industry and effective control measures(1984) Peries, O.S.; Liyanage, A. de S.Item Development to increase income from the rubber industry(1984) Peries, O.S.Item Effect of leaf litter on direct and indirect mobilization of P from apatite(Rubber Research Institute. Agalawatta, 1987) Pathiratne, L.S.S.; Waidyanatha, U.P. De S.; Peries, O.S.Leaf litter as direct and indirect means of improving P availability from apatite was tested. Application of leaf litter impo=roved the P uptake by indicator crops but did not influence the availability of P from applied apatite.Item Effect of vesicular-arbuscular mycorrhizae on seedling of Hevea and Pueraria phaseoloides(Rubber research Institute. Agalawatte, 1984) Jayaratne, A.H.R.; Peries, O.S.; Waidyanatha, U.P. De S.Hevea seedlings showed a slight growth responce when inculated with Gigaspora margarita out of four species, tested in sterilised soil. There were no significant differences in the uptake of nutrient by mycorrhizal Hevea plants. Non-mycorrhizal Pueraria plants grew very poorly unless they were given liberal quantities of phosphate fertilizer, confirming previous reparts. All mycorrhizal plants took up more nutrients from soil than non-mycorrhizal plants. Effective nodule formation wassignificantly grater in mycorrhizal plants when phosphorus was added.Item Effect of weather factors on disease Establishment and sporulation of Phytopthora meadi on rubber pods(Rubber Research Institute of Sri Lanka:Agalawatta, 1983) Liyanage, A. De S.; Peries, O.S.; Dharmaratne, A.; Dantanarayana, D.M.Item Fertilizer use among perennial crops(Rubber Research Institute of Sri Lanka. Agalawaththa, 1982) Peries, O.S.; Yogarathnam, N.Item Fertilizer use among perennial crops(Rubber Research Institute of Sri Lanka:Agalawaththa, 1982) Peries, O.S.; Yogarathnam, N.Item Fungi associated with rubber growing soils in Sri Lanka(Rubber Research Institute. Colombo, 1979) Peries, O.S.; Liyanage, A.De.S.; Liyanage, N.I.S.Item A Handbook Of Rubber Culture And Processing(Agalawatta:Rubber Research Instiute Of Ceylon, 1970) Peries, O.S.Item The impact of current research on the development of the NR industry(Rubber Research Institute. Agalawatta, 1973) Peries, O.S.Item The management of plant diseases with special reference to Hevea(Rubber research Institute. Agalawatte, 1984) Peries, O.S.; Liyanage, A. De S.Item The management of plant diseases with special reference to Hevea(Rubber research Institute:Agalawatte, 1984) Peries, O.S.; Liyanage, A.De S.Item Observations on the development of the sporophore of Rigidoporus lignosus and the release and germination of basidiospores(Rubber Research Institute of Sri Lanka. Agalawaththa, 1982) Liyanage, I.; Peries, O.S.; Liyanage, A. de S.; Wettasinghe, C.Item Observations on the development of the sporophore of Rigidoporus lignosus and the release and germination of basidiospores(Rubber Research Institute of Sri Lanka:Agalawaththa, 1982) Liyanage, I.; Peries, O.S.; Liyanage, A. de S.; Wettasinghe, C.