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Urea is the most widely traded nitrogen fertiliser mainly because

  • A.it releases its nitrogen most slowly of all
  • B.it has the highest nitrogen content
  • C.it is the cheapest of all per tonne to manufacture
  • D.it does not need ammonia as a feedstock

Answer: B

At about forty-six per cent nitrogen it carries the least dead weight per unit of nutrient, which dominates shipping economics. Its drawback is loss of ammonia by volatilisation if it is not incorporated into the soil.

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