Which of the following soils is very hard to cultivate?

Red soil is hard to cultivate because it is poor in nitrogen, phosphorus and humus and needs irrigation and fertilisers.

Alluvial soil is among the most fertile and easily farmed soils.

Cotton black soil holds moisture well and supports many crops without much effort.

Sandy soil drains fast but is still easier to work than infertile red soil.

Red soil owes its colour to iron oxides and is often thin and coarse.

It covers much of the Deccan and the peninsular uplands.