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    Question

    In case of degraded alkali soil, if the extensive

    leaching of saline-sodic soil occurs in absence of any source of calcium and magnesium, part of exchangeable Na is frequently replaced by __ ?
    A Ca++ Correct Answer Incorrect Answer
    B Mg++ Correct Answer Incorrect Answer
    C H+ Correct Answer Incorrect Answer
    D D.K+ Correct Answer Incorrect Answer

    Solution

    If extensive leaching of a saline-sodic soil occurs in the absence of any source of calcium or magnesium, part of the exchangeable sodium is gradually replaced by hydrogen. Such soil may be slightly acidic in nature, yet it may contain enough sodium to give it an unstable structure. Such a soil is designated as a degraded sodic soil, earlier known as degraded alkali soil.

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