Abstract
Eight soil pedons were chosen. in Nineveh Province to determine the effect of physiochemical factors 0n pedogenic distribution of manganese extracted by DCB method. The results indicated that topography had a significant effect in all studied soils. the highest . manganese values in Al-Hamdania ranged between (40-47) mg.Kg-1. followed by Al-Fadhlia & Kara-Tapa regions ranged between (36-39). (11.6-35) mg.Kg-1 respectively. Soil depth had significant effect in Al-Fadhlia & Al-Hamdania regions with ratio effect of 30% . 50% respectively. CaCO3 had a significant effect in Al-Hamdania region only. Organic matter had a slight effect. Soil fine fraction (silt & clay) had unclear effect in which manganese ranged between 37.2-39.52 mg.Kg-1in Al-Hamdania region. Soil pH had non-significant effect on manganese pedogenic distribution in studied soils. DCB was effective extracting method for Mn-Fe concretions and thin black coatings on red and green mudstone.
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