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    Question

    The primary mode of soil aeration

    is
    A Diffusion Correct Answer Incorrect Answer
    B Mass flow Correct Answer Incorrect Answer
    C Diffusion‐dispersion combined Correct Answer Incorrect Answer
    D Transfer of dissolved gases by rain or irrigation Correct Answer Incorrect Answer

    Solution

    Mass flow refers to the movement of gases (such as oxygen and carbon dioxide) through the soil in response to pressure gradients. In the context of soil aeration, mass flow is a significant mechanism by which gases, especially oxygen, move through the soil pores due to differences in partial pressures. This movement occurs along with the movement of water in the soil, influencing the availability of oxygen to plant roots and soil microorganisms.

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