what are the chemical composition of red and yellow soil?
Its chemical composition generally includes non-soluble material 90.47%, iron 3.61%, aluminium 2.92%, organic matter 1.01%, Magnesium 0.70%, lime 0.56%, carbon di-oxide 0.30%, potash 0.24%, soda 0.12%, phosphorus 0.09% and nitrogen 0.08%.