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      Question

      Which among the following is a major constraint in the

      rice–wheat system of Indo-Gangetic plains affecting long-term sustainability?
      A High rainfall Correct Answer Incorrect Answer
      B Weed diversity Correct Answer Incorrect Answer
      C Soil micronutrient depletion Correct Answer Incorrect Answer
      D Frequent drought Correct Answer Incorrect Answer

      Solution

      Continuous rice–wheat cropping without balanced fertilizer use leads to depletion of micronutrients (Zn, Fe, S). This reduces productivity and necessitates nutrient management interventions.

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