The C : N ratio of farmyard manure is

A. 20 : 1

B. 10 : 1

C. 30 : 1

D. 40 : 1

Answer: Option D

Solution(By Examveda Team)

The C : N ratio of farmyard manure 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.