5.5. Soil Organic Matter and Exchangeable Mineral Content
The organic matter of the soil (SOM) was estimated to 288 t∙ha
−1
, with a carbon content of 108 t∙ha
−1
and a ni-trogen content of 12 t∙ha
−1
(Table 7). The exchangeable (Exch) amounts in an extraction with ammonium ace-tate (Am-Ac) were in decreasing order: Ca, P, Mg, K, Na and Mn.