■ BLACK SOIL.
#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.
#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.