FTIR analytical study has been carried out to investigate the mineralogical composition of the soil. A field experiment was carried out at Servaikaranmadam of Thoothukudi district, Tamil Nadu during Kharif season in 2018 on sandy clay loam soil to access the effect of organic manures in the soil and to determine the chemical compositions of soil samples. The experiment was laid out in Randomized Block Design (RBD) with three replications. The experiment comprised of thirteen treatment combinations. The results of the present study revealed that soils have various mineral compositions namely Quartz, Kaolinite, Montmorillonite, Feldspar and Illite etc. The application of organic manures like Goat manure (G), Vermicompost (V) and Swine manure (S) in triple manure concentration at 17 t ha-1 reveals the presence of Organic Carbon along with the minerals, before and after harvest. This ensures a better yield of black gram (Vigna Mungo L.).