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Which nutrient is not available in fertilizers?

  • A.Nitrogen
  • B.Phosphorus
  • C.Iron
  • D.Potassium

Answer: C

Iron is not supplied by ordinary fertilisers.

Fertilisers supply the three macronutrients - nitrogen, phosphorus and potassium, the N-P-K of the label - because plants need them in quantity. Iron is a micronutrient, needed in traces and usually present in the soil already; manures supply it when it is lacking.

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