Regur soil is most suitable for the cultivation of:

Regur soil, also known as black soil or 'tropical chernozems', is most suitable for the cultivation of cotton [2]. The term 'Regur' itself is derived from the Telugu word 'Reguda', which refers to the soil's specific suitability for cotton, leading to its common name 'black cotton soil' [1]. These soils are characterized by a high clay content, particularly montmorillonite minerals, which provide excellent water-retaining capacity [1]. This moisture retention is crucial for cotton, a crop that requires sustained hydration during its growing period. Regur soils are typical of the Deccan Trap region, formed from weathered basaltic lava rocks [2]. While these soils can also support crops like sugarcane, groundnut, and tobacco with irrigation and fertilizers, cotton remains the primary and most characteristic crop associated with this soil type across the Indian plateau.

Sources

1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 6: Soils > 3. Black or Regur Soils > p. 11
2. [2] NCERT. (2022). Contemporary India II: Textbook in Geography for Class X (Revised ed.). NCERT. > Chapter 1: The Rise of Nationalism in Europe > Black Soil > p. 9