Certified valuesTotal nitrogen . 0.222 w(N)/10-2Organic matter . 3.83 w(OM)/10-2Cation exchange capacity 19.6 cmol(+)/kg Exchangeable magnesium 2.76 cmo(1/2Mg2+)/kg Exchangeable calcium . 13.1 cmol (1/2Ca2+)/kg Exchangeable sodium . 0.26 cmol (Na+)/kg Ex