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An NPK grade of 20-20-0 means the fertiliser contains

  • A.20 per cent of each of three nutrients
  • B.20 per cent nitrogen, 20 phosphate, no potash
  • C.20 kilograms of each nutrient in every bag
  • D.a ratio of two parts of each of the three

Answer: B

The numbers are percentages by mass, reported as nitrogen, phosphorus pentoxide and potassium oxide by convention. The oxide convention is a historical one but is universal in the trade. Grades are always written in that order.

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