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organic
b horizon
no it is found in the topsoil or a horizon
soils have different layers present in it as the depth increases. These layers are called horizons. Humus as we all know is present in the top layer of the soil,which is several inches in thickness and is called A horizon.
The A horizon is the top layer and is made out of sand, clay silt, and humus. It is where most plants grow. =-) Hope that helped.
The Fertile soil contains lots of microorganisms which decompose the complex dead bodies of animals and plants into simpler substance called Humus.
A horizon B horizon C horizon O horizon
The O-Horizon
Well, the A horizon is made up of topsoil, a crumbly, dark brown soil composed of humus, clay, and other minerals.
Because the A horizon contains more humus which makes the A horizon more organic
A horizon
AnswerThe O horizon and the A horizon are most rich in humus due to the organic material being highest in those two layers. O is higher than A, though. mjhgbb