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    Leaching requirement (LR) is calculated as:
    Question

    Leaching requirement (LR) is calculated as:

    A.

    LR = 1 – ECw/ECe

    B.

    LR = ECw/ECe

    C.

    LR = (ECe – ECw)/ECe

    D.

    LR = 1 + ECw/ECe

    Correct option is A



    Where:
    · ECw = salinity of irrigation water
    · ECe = maximum permissible salinity of soil saturation extract
    Why other options are wrong
    · (b) Wrong formula.
    · (c) Not used in LR calculation.
    · (d) Incorrect; LR cannot exceed 1 by definition.

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