Concentration and Distribution of Iron and Manganese Fractions in Alabama Ultisols

Abstract

Information on metal forms and contributions of soil properties on metal distribution in Alabama soils is either limited or meager. This study chemically partitioned and evaluated soil Fe and Mn distributions and applied stepwise multiple regressions to identify the soil properties influencing their distributions in some Alabama Ultisols. Iron and Mn distributions among metal fractions were generally dependent on total metal content, soil properties, and degree of chemical weathering. Distributions among metal fractions showed that Fe was mainly in the residual fraction (Ͼ 85%), whereas Mn was predominantly oxide-bound and in the residual fraction (Ͼ 90%). The proportion of Fe fractions in the soils was in the order: residual Ͼ oxides (crystalline FeO, amorphous FeO, MnO) Ͼ organic Ͼ exchangeable, whereas Mn was in the order: oxide-bound (MnO, amorphous FeO, crystalline FeO,) Ն residual Ͼ exchangeable Ͼ organic fraction. Stepwise multiple regression analysis showed that pH accounted for 33% of the total variability in exchangeable Fe, whereas SOM accounted for 47.1% of the total variability in exchangeable Mn. Clay and sand contents accounted for 42.2 and 52.3%, respectively, of the total variability in the residual Fe fraction, whereas silt accounted for 19.7% of the total variability in residual Mn distribution in these soils. (Soil Science 2004;169:489-000)

Relationships of soil properties with Mn and Zn distribution in acidic soils and their uptake by a barley crop

“…Although soil Mn distribution has been shown to depend on granulometric fractions (Tazisong et al, 2004), no correlations were found between (single or sequential) Mn extractions and clay content in these soils. A negative but significant correlation was obtained between WSEX Zn fraction and, soil pH (r = − 0.50, P b 0.01) and clay content (r = − 0.47, P b 0.02), suggesting that Zn availability may be limited by soil pH and the amount of clay present in soils.…”

“…The degree of metal association with specific geochemical phases is strongly dependent upon the physico-chemical conditions of the soils (Manahan, 1994;Navas and Lindhorfer, 2003;Tazisong et al, 2004). Multivariate methods are more precise than univariate statistics at describing the relationships of metals in soils and the factors that influence these relationships (Boruvka et al, 2005).…”

Legacy phosphorus in Alabama Hartsells soil after long‐term amendment with broiler litter

“…Hartsells soils are characterized by a high degree of weathering and high mineral content, as observed by typical red soil coloration. In one study, Tazisong et al (2004) conducted stepwise multiple regression analyses and found that soil pH accounted for 33% of the total variability in exchangeable Fe of ultisols, and OM accounted for 47% of the variability in exchangeable Mn. Furthermore, clay and sand contents accounted for 42% and 52% of the variability in Fe distribution, respectively, and silt accounted for 20% of the variability in Mn distribution.…”

Zinc fractionation of tropical paddy soils and their relationships with selected soil properties

“…[2] The soil Zn fractions are highly dependent on the physicochemical soil properties, such as pH, organic carbon (OC), clay content and cation exchange capacity (CEC). [3,4] Paddy fields with different soil moisture regimes bring about numerous changes in the soil physicochemical and electrochemical properties, such as pH, Eh, electrical conductivity (EC), CaCO 3 content and amorphous and crystalline oxides of Fe and Mn. Thus, the chemistry and effect of the aformentioned properties appear to be of major importance in Zn fractions, and therefore improve the available Zn pools.…”