[PDF]Reference soil Gabon 4: Ferralsol
https://ees.kuleuven.be/africa-in-profile/dig-deeper/profile-database/Reference%20soil%20Gabon%204.pdf
Reference soil Gabon 4: Ferralsol. Description. A well drained, extremely deep soil (> 180cm) with a lot of biological activities (termites, earthworms), derived from precambrian sandstone. ..... Organic Matter is digested in sulphuric acid (and hydrogen peroxide) with selenium as catalyst. Nitrogen is converted to ammonium ...