The role of soil minerals in red and black Vertisol in Jeneponto Regency

Abstract

Abstract Vertisol is one type of soil that is found with various colour variations. Various factors that influence these colour variations are topography, parent rock, organic matter and iron oxide and manganese. The research was conducted in the Jeneponto Regency by purposive sampling based on the colour of the soil to be investigated. The results of this study indicate that clay minerals are quite influential in the colour of the soil. Iron oxide minerals such as Goethite, Hematite and Halloysite are often found in red soils, indicating that the soil has undergone further weathering. However, Vertisol can not be said to have experienced weathering further, because it is still found perishable minerals such as Calcite and Sanidin, so Vertisol with color variations is indicated to have experienced early development. The red colour on Vertisol was influenced by iron oxide minerals such as Goethite, Hematite and Halloysite and the slopes ranging from 8-15% so that washing is indicated which makes montmorillonite unstable and turn into other minerals. While the black colour on Vertisol was indicated by a flat slope so that intensive washing does not occur.

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