Why is black regur soil well suited for growing cotton in Karnataka?

Black regur soil, found in the northwestern part of Karnataka, is highly suitable for growing cotton primarily due to its exceptional moisture-retentive properties.12

Derived from underlying volcanic basaltic rock, these soils possess a high clay content that allows them to hold significant amounts of water, which is essential for crop development. While these soils develop wide cracks during the dry season, their iron-rich, granular structure makes them resistant to wind and water erosion. Although they are relatively poor in humus, their ability to retain moisture ensures they respond very well to irrigation, making them a traditional and productive choice for cotton cultivation in the region.12