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The R:S ratio used in soil microbiology compares

  • A.Number of rod-shaped cells with the number of spherical ones
  • B.Rhizosphere population with bulk soil population
  • C.Root biomass with the shoot biomass of the same plant
  • D.Respiration rate with the rate of substrate supply

Answer: B

R:S divides the microbial count in the rhizosphere by the count in the surrounding bulk soil, so it measures how strongly the root stimulates microbial growth. It is highest for bacteria, around twenty to one, and lower for fungi and actinomycetes. The other expansions of the letters are inventions.

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