Sirisena, D.N.Jayawardena, N.P.Wickramasinghe, W.M.A.D.B.Rathnayake, W.M.U.K.Mapa, R.B.2020-12-072020-12-072008Annals of the Sri Lanka Department of Agriculture, 10:p.199-210https://dl-doa.nsf.gov.lk/handle/1/2888SOIL FERTILITYRiceSoil fertilitySpatial variabilitySpatial variability of some soil fertility parameters in rice fields of girithale irrigation schemeA