Senevirathna, A.M.W.K.Seneviratna, P.Weerakoon, U.S.De Alwis, M.N.deZoysa, L.Pathirana, P.D.Chaminda, J.2014-07-102014-07-102007Bulletin of the Rubber Research Institute of Sri Lanka, 48:p.27-31https://dl-rri.nsf.gov.lk//handle/1/2535AgricultureRubberHevea brasiliensisPlant materialCertificationLand productivityCertification of planting material of rubber in Sri Lankan nurseries. processes , constraints and requirementsArticle