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Immobilisation of soil nitrogen means that nitrogen is

  • A.Taken up into microbial cells and made unavailable to plants
  • B.Leached below the rooting zone by percolating drainage water
  • C.Lost to the atmosphere as gas during a waterlogged spell
  • D.Bound irreversibly onto clay surfaces by summer heating

Answer: A

When microbes decompose material poor in nitrogen they draw mineral nitrogen from the soil into their own biomass, locking it away until they die. It is the reverse of mineralisation, and the balance between the two decides whether a crop is fed or starved after residues are ploughed in.

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