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What is Soil Air?

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Soil air is a continuation of the atmospheric air. Unlike the other

components, it is constant state of motion from the soil pores into the atmosphere

and from the atmosphere into the pore space. This constant movement or

circulation of air in the soil mass resulting in the renewal of its component gases is

known as soil aeration. .

Composition of Soil Air: The soil air contains a number of gases of which

nitrogen, oxygen, carbon dioxide and water vapour are the most important. Soil air

constantly moves from the soil pores into the atmosphere and from the atmosphere

into the pore space. Soil air and atmospheric air differ in the compositions. Soil air

contains a much greater proportion of carbon dioxide and a lesser amount of

oxygen than atmospheric air. At the same time, soil air contains a far great amount

of water vapour than atmospheric air. The amount of nitrogen in soil air is almost

the same as in the atmosphere.

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