Question

which horizon is rich in humus​

Answer 1

Answer:

I believe you are trying to ask which soil is rich in humus (the organic material).

Alluvial Soils are rich in humus, that covers the most part of the Indian Nothern Plains.

Hope this helped.

Answer 2

Answer:

A horizon

Explanation:

The uppermost layer of the soil is called A horizon it is usually dark in colour and contains very fine particles of rock. It is rich in humus which makes the soil fertile plants get the essential nutrients from this layer. This soil in this layer is soft ,porous and can hold more water .This layer is also known as top soil .