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    • Question

      What is the primary function of humus in

      soil?
      A Increase salinity Correct Answer Incorrect Answer
      B Reduce porosity Correct Answer Incorrect Answer
      C Enhance nutrient retention Correct Answer Incorrect Answer
      D Promote waterlogging Correct Answer Incorrect Answer

      Solution

      Humus improves cation exchange capacity (CEC), retaining nutrients like Ca²⁺, K⁺, and Mg²⁺ for plant uptake.

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