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    Question

    Alkali soils appear black due

    to
    A Dissolved organic matter Correct Answer Incorrect Answer
    B Dissolved salts Correct Answer Incorrect Answer
    C High pH Correct Answer Incorrect Answer
    D High ESP Correct Answer Incorrect Answer

    Solution

    Due to presence of high amount of exchangeable sodium and high pH, the soil colloids get dispersed and organic matter present in the soil are dispersed and dissolved. When these dispersed and dissolved organic matter is deposited on the surface, it gives alkali soil a dark brown-blackish appearance

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