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The three primary nutrients a fertiliser supplies are

  • A.nitrogen, phosphorus, potassium
  • B.nitrogen, calcium and sulphur
  • C.carbon, hydrogen and oxygen
  • D.iron, zinc and manganese

Answer: A

These three are needed in the largest quantity and are what an NPK grade reports. Calcium and sulphur are secondary nutrients and the metals are micronutrients. A grade reports only these three. The others are supplied separately when a soil lacks them.

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