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Green manuring improves soil nitrogen most when the crop ploughed in is

  • A.A grass
  • B.A legume
  • C.A cereal
  • D.A root crop

Answer: B

A legume carries nitrogen fixed from the atmosphere by its root nodules, so incorporating it adds nitrogen the soil did not previously hold. Non-legumes merely recycle nitrogen already present, and their wide carbon to nitrogen ratio may even immobilise more of it for a time.

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