BLACK SOIL • Also known as Regur soil • The parent material for most of the black soil are the volcanic rocks that were formed in the Deccan Plateau. • In Tamil Nadu, gneisses and schists form the parent material. The former are sufficiently deep while the later are generally shallow. • These are the region of high temperature and low rainfall. It is, therefore, a soil group typical to the dry and hot regions of the Peninsula. • A typical black soil is highly argillaceous (containing clay) with a large clay factor, 62 per cent or more. • In general, black soils of uplands are of low fertility while those in the valleys are very fertile. • The black soil is highly retentive of moisture. • It swells greatly on accumulating moisture. • In the rainy season, the soil gets very sticky and hence ploughing, and other agricultural activities demand more effort. • In summer, the moisture evaporates the soil shrinks and is seamed with broad and deep cracks. JOIN & SHARE https://t.me/Alldefenceexams 78 views16:26
