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Incorporating straw with a very wide carbon to nitrogen ratio into soil usually causes

  • A.Complete suppression of the soil fungal population
  • B.A temporary shortage of available nitrogen for the crop
  • C.An immediate flush of nitrate available to the crop
  • D.A rapid and lasting rise in soil pH

Answer: B

Decomposers need roughly one part nitrogen to every twenty-five of carbon, so material far wider than that forces them to scavenge mineral nitrogen from the soil, immobilising it. The nitrogen returns as those microbes die, but the crop may go short in the meantime.

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