Senevirathna, A.M.W.K.Seneviratna, P.Weerakoon, U.S.De Alwis, M.N.deZoysa, L.Pathirana, P.D.Chaminda, J.2012-07-312012-07-312007Bulletin of the Rubber Research Institute of Sri Lanka48pp.27-31https://dl.nsf.gov.lk/handle/1/9162AgricultureRubberHevea brasiliensisPlant materialCertificationLand productivityCertification of planting material of rubber in Sri Lankan nurseries. processes , constraints and requirementsArticle