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Soil aeration
1. Soil aeration is the exchange of gases like oxygen and carbon dioxide between the soil pores and atmosphere. It ensures sufficient oxygen for plant roots and microbes while preventing excess carbon dioxide build up. 2. Gaseous exchange occurs through both mass flow and diffusion. Mass flow is driven by pressure gradients while diffusion occurs down partial pressure gradients between the soil pores and atmosphere. 3. Factors like soil texture, structure, moisture and organic matter influence the gas composition and aeration status of soils by affecting the pore space available for gas exchange. Well-aerated soils support better plant growth.
