Question

    …………………..measures the proportion of cation exchange sites occupied by sodium.

    A EC Correct Answer Incorrect Answer
    B ESP Correct Answer Incorrect Answer
    C RSC Correct Answer Incorrect Answer
    D CEC Correct Answer Incorrect Answer
    E All of these Correct Answer Incorrect Answer

    Solution

    The exchangeable sodium percentage (ESP) measures the proportion of cation exchange sites occupied by sodium. Soils are considered sodic when the ESP is greater than 6, and highly sodic when the ESP is greater than 15.

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