Why black soil is best for cotton?

Black soil are very fine grained and dark, contain a high proportion of calcium and magnesium carbonates. Black soils are rich in montmorillontic and beidellitic group of clay minerals. Cotton cultivation requires high moisture retention and black soil has moisture retention property due to its clayey nature. Cotton is a rainfed crop. It grows in area where irrigation is not possible. Black soil can retain water which is very useful property for rainfed crops to grow.

Black soil is also known as black cotton soil as it is the most suitable for cotton growth. Hence black soil is best for cotton.