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Nitrate is lost from soil more readily than ammonium chiefly because

  • A.Nitrate is negatively charged and is not held by clay
  • B.Nitrate is a gas at ordinary soil temperatures
  • C.Ammonium is destroyed by sunlight reaching the soil surface
  • D.Nitrate is almost insoluble in soil water

Answer: A

Clay and organic surfaces carry a net negative charge, so they retain the ammonium cation while the nitrate anion stays in solution and moves with drainage water. That is why nitrification effectively converts a held form of nitrogen into a leachable one.

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