Certified valuesTotal nitrogen . 0.109 w(N)/10-2Organic matter . 1.82 w(OM)/10-2Cation exchange capacity 1.6 cmol(+)/kg Exchangeable magnesium 3.54 cmo(1/2Mg2+)/kg Exchangeable calcium . 14. cmol (1/2Ca2+)/kg Exchangeable sodium . 0.20 cmol (Na+)/kg Exch