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Which measurement would tell you most directly how biologically active a soil is at the moment of sampling?

  • A.The clay content of the sample
  • B.The colour of the dried sample
  • C.The rate of carbon dioxide evolution from the sample
  • D.The total nitrogen content measured in the same sample

Answer: C

Respiration integrates the activity of the whole living community as it stands, including organisms that cannot be cultured. Total nitrogen and clay content are properties of the soil that change over years, and colour is only an indirect clue to organic matter.

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