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    Question

    According to USDA classification of salt affected soils;

    a soil having EC >4 mmho/cm; ESP >15; pH
    A Saline soil Correct Answer Incorrect Answer
    B Saline-Alkali Correct Answer Incorrect Answer
    C Alkaline soil Correct Answer Incorrect Answer
    D Sodic soil Correct Answer Incorrect Answer
    E Acidic soil Correct Answer Incorrect Answer

    Solution

    1) Saline soils -  Salt concentration is more and EC of the soil is > 4 dS/m, Exchangeable sodium percentage is < 15, pH is below 8.5 2) Non saline- alkali soil: (sodic soil)- Low soluble salts, EC < 4 dS/m, Exchangeable Na percentage is > 15,  pH is > 8.5 3) Saline alkali soils -  High concentration of soluble salts with ESP is greater than 15, EC> 4 dS/m, pH is < 8.5

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