Is Deccan Plateau suitable for crop cultivation?
Yes because :
The soil on the Deccan Traps can be generally expected to be made from decomposed Basalt, which is mineral rich, being mafic lava. Also, breaking down as it has in a moist, tropical environment, there is a good opportunity for organic matter to be added to the mineral content. Other soil materials could well be washed down from the Himalayas, depending on location.