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      Question

      A fertile soil must contain all the 3 major nutrients

      namely___________ for basic plant nutrition, in addition to 9 key micro nutrients.
      A Calcium, Nitrogen, Potassium Correct Answer Incorrect Answer
      B Nitrogen, Iron, Phosphorus Correct Answer Incorrect Answer
      C Nitrogen, Phosphorus, Potassium Correct Answer Incorrect Answer
      D Potassium, Calcium, Sulphur Correct Answer Incorrect Answer

      Solution

      The three main nutrients are nitrogen (N), phosphorus (P) and potassium (K). Together they make up the trio known as NPK

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