Question

reason why laterite soil is not suitable for cultivation

Answer 1

Laterite soil is not suitable for cultivation because it not fertile at all. They are coarse in texture and poor in nitrogen, phosphoric acid, potash and urea. 
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Answer 2

Laterite soils are those soils which are found in the areas which receive high rainfall and have very high temperature. ... This results in the less humus content in the soil. Also , they have excess amount of iron in them . Hence , they are not fertile soil and are not suitable for cultivation.