Dharmakeerthi, R.S.Chandrasiri, J.A.S.Edirimanne, V.U.2016-04-082016-04-082013Journal of the Rubber Research Institute of Sri Lanka, 93:p.1-15https://dl.nsf.gov.lk/handle/1/23134enHevea brasiliensiHumic acidMacro nutrientsOrganic fertilizerYoung buddingHumic acid based liquid organic fertilizer improved the growth of nursery and immature rubber plants grown in Boralu soil seriesArticle