C : N ratio of FYM is

A. 20 : 1

B. 40 : 1

C. 50 : 1

D. 80 : 1

Answer: Option B

Solution(By Examveda Team)

C : N ratio of FYM is 40 : 1.
C : N ratio is the ratio of the mass of carbon to the mass of nitrogen in a substance.
FYM (Farmyard manure) is an important organic resource for agricultural production in live-stock-based farming systems in the semi-arid tropics of India.
The C : N ratio of farmyard manure is 40 : 1.