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Deep ploughing of a soil generally causes organic matter to

  • A.Decline, because aggregates are broken and decomposition speeds up
  • B.Rise, because crop residues are buried where they decay slowly
  • C.Stay exactly constant, since ploughing only moves soil about
  • D.Convert directly into humus without passing through microbial biomass

Answer: A

Cultivation shatters aggregates and exposes the organic matter they protected, so decomposers reach carbon that was previously physically inaccessible and respiration rises. Burial slows losses from the surface but does not offset the overall decline.

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