Hydrochloric acid (0.1M) and dtpa extractable and total iron and manganese in basaltic soil profiles of the Nigerian savanna

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Abstract
The contents of 0.1 M HCl and DTPA extractable and total iron (Fe) and manganese (Mn) were determined in soil profiles developed on four groups of basaltic parent materials, namely, the Newer‐, Older‐, Lateritized‐Older‐, and Biu‐basalts. HCl‐and DTPA‐extractable and total Fe in the soils ranged from 15.0 to 66.3 mg/kg, 1.1 to 26. 7 mg/kg, and 4.50 to 10.50%, respectively, with corresponding means of 37.5 mg/kg, 9.5 mg/kg, and 7.33%. The corresponding forms of Mn ranged from 1.1 to 89.0 (mean, 39.8) mg/kg, 0.3 to 114.7 (mean, 24.3) mg/kg and 34 to 1010 (mean, 346) mg/kg, respectively. The soils were high in total Fe and Mn and sufficient in the available forms (HCl‐and DTPA‐extractable forms). Total Fe and Mn were neither related to the available forms or to soil properties tested. The available forms were, however, related one with another and largely associated with organic matter.