Black soils are also known as the Regur Soil or the Black Cotton Soil.
- The black soils are generally clayey, deep, and impermeable.
- 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‟. Because of this character of slow absorption and loss of moisture, the black soil retains the moisture for a very long time.
- The black soils are rich in lime, iron, magnesia, and alumina. Hence option (d) is correct.
- They also contain potash. But they lack phosphorous, nitrogen, and organic matter. The color of the soil ranges from deep black to grey.
- Black soil covers most of the Deccan Plateau which includes parts of Maharashtra, Madhya Pradesh, Gujarat, Andhra Pradesh, and some parts of Tamil Nadu.