The biological method for determining deficiency of lime, P and K is

A. Aspergillus test

B. Neubavers method

C. Azotobacter Plague Test

D. None of these

Answer: Option C

Solution(By Examveda Team)

The biological method for determining the deficiency of lime, P and K is Azotobacter Plague Test.
The sensitivity of the Azotobacter group of organisms to soil acidity and lack of available phosphate has been long recognized and has been the basis of microbiological tests to check soil deficiencies.