Distribution of potassium forms in soils under repeated rubber cultivation and virgin forest - Ulaganathan A; Ambily K.K; Gilkes R.J; Jessy M.D; Nair N.U (PLACROSYM XX, 12-15 December 2012, UPASI Tea Research Foundation, Coimbatore, India, Abstracts, pp. 67-68.)
Keywords: Exchangeable K; K reserve; Mineral K; Organic carbon; Water soluble K