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Applying a nitrification inhibitor to soil is intended to

  • A.Raise the pH of an acidic soil towards neutral
  • B.Keep applied nitrogen in the ammonium form for longer
  • C.Prevent leguminous crops from forming nodules
  • D.Stop soil organic matter from decomposing further

Answer: B

Slowing the conversion of ammonium to nitrate keeps nitrogen in the form that clay retains, reducing losses to leaching and to denitrification. The inhibitors target the nitrifying organisms specifically and leave fixation and decomposition alone.

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