Wijebandara, D.M.D.I.Dasog, G.S.Patil, P.L.Hebber, M.2014-06-032014-06-031994Tropical Agricultural Research , 6:p.211-222https://dl-cri.nsf.gov.lk//handle/1/3917Comparison of routine laborarity methods for the estimation of plant available phosphorus in soils of the low country intermediate zone of Sri Lanka