Physicochemical Properties as Affected by Concretionary Nodules of Oxic Rhodustalf of Southern Guinea Savanna Agroecological Zone of Nigeria

Diverse concretion types are prevalent across diverse soil types in the savanna region. However, its chemistry, mineralogy, profile, dimension, and abundance can significantly vary, influenced by the distinct weathering processes characteristic of each location. The accumulation of concretions in soil can have a considerable impact on its physical and chemical properties, especially at high concentrations. This effect largely depends on the chemical composition and mineralogy of the oxide components present [1]. Despite the potential significance of these effects, the influence of concretionary nodules on soil physicochemical properties remains underexplored. Existing studies are few and often lack detailed insights. Therefore, this study aims to investigate the physicochemical properties of soil influenced by concretionary nodules in the Oxic Rhodustalf of Southern Guinea Savannah, Nigeria. Results obtained from our analysis revealed interesting variations obtained. Three distinct textural classes were identified regarding physical properties: Sandy Loam, Sandy Clay Loam, and Loamy Sand. At various sites, the soil generally exhibited a slightly higher clay content (20.06 %) and sand content (74.04 %) compared to the concretions. However, the concretions had a higher silt content, at 7.34 %. Obbo Ile recorded the highest clay content (24.09 %) but the lowest silt and sand content among the locations. In contrast, Owu Isin had a significantly higher sand content (75.04 %). Clay content increased with depth, while sand content decreased. Although silt content generally increased, it dropped significantly after the 90-120 cm depth. Analysis of the chemical properties revealed significant variations (p