Wijesuriya, B.W.Thattil, R.O.2014-11-122014-11-121996Tropical Agricultural Research, 8:p.20-29https://dl.nsf.gov.lk/handle/1/12045AgricultureRubberCrop improvementHevea brasiliensisYield -girth relationshipCovariance techniquesField experimentsAgronomyUse of covariates in improving precision of field experiments in rubberA