Question

why is the human content is laterite soil is low

Answer 1

Humus content of the laterite soil is very low. Because,

The soil is formed due to intense leaching. So the nutrients of the soil are washed away by heavy rains.
The soil is formed in the regions of high temperature. So, most of the micro-organisms, particularly the decomposers, like bacteria, get destroyed.

Answer 2

Humus content of lateraite soil is low because this soil is found in the regions of high temp and heavy rainfall.Due to high temperature , the decomposers and bacteria in the soil get destroyed and hence the humus content is less.