The rhizosphere effect can be quantitatively represented by

A. C : N ratio

B. C : P ratio

C. R : S ratio

D. All of the above

Answer: Option C

Solution(By Examveda Team)

The rhizosphere effect can be quantitatively represented by the R : S ratio.
The term rhizosphere to soil ratio indicates the number of microbes in rhizospheric soil divided by the number of microbes in soil free of plant roots. R:S ratio is greater for bacteria (20 : 1) and less for fungi and actinomycetes.