PLATEAU and is made up of lava flows.Regur soil or black soil is ideal for growing cotton and is known as black cotton soil.The soil is rich in soil nutrients, such as magnesium, calcium CARBONATE, potash, and lime.The black soils are generally poor in phosphoric contents.The black or regur soils are made up of clayey soil, well-known for their capacity to hold moisture.They swell and become sticky when wet and shrink when dried. So, during the dry season, this soil develops WIDE cracks. Thus, there occurs a kind of ‘self ploughing’.The colour of the soil RANGES from deep black to grey.There are six soil deposits in India are following:-Black soilRed soilLaterite soilDesert or Arid soilForest Mountainous soilAlluvial soilThese (soils) are formed by the sediments brought down by the rivers.