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Nitrification proceeds most rapidly in soil that is

  • A.Waterlogged and strongly acidic for most of the season
  • B.Frozen through and dry at the surface
  • C.Anaerobic and rich in dissolved sulphide
  • D.Well aerated and near neutral to slightly alkaline

Answer: D

Both steps are aerobic oxidations, so they need oxygen, and the organisms prefer a pH above about 7. Waterlogging removes the oxygen and favours denitrification instead, while strong acidity slows the nitrifiers markedly.

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