Red soils are formed as a result of wide diffusion of iron in the rocks.
Characteristics of Red Soils: These soils are found in Tamil Nadu, Karnataka, Andhra Pradesh and areas on periphery of Deccan Plateau. These soils have been formed due to the decomposition of underlying igneous rocks. The red colour of these soils is due to oxidation and diffusion of iron in hard crystalline rocks. These are given to the cultivation of millets, pulses, linseed, tobacco etc. These soils cover the largest area in Peninsular India. These soils are poor in lime, nitrogen and humus. Fertilizers are added to make these soils fertile.
