Ammonification is the process by which _____.
a. ammonia is released during the decomposition of nitrogen-containing organic compounds
b. ammonium is converted to nitrite and nitrate in soils
c. nitrate from soil is transformed to gaseous nitrogen compounds such as NO, N2O, and N2
d. gaseous nitrogen is fixed to yield ammonia
Answer: a. ammonia is released during the decomposition of nitrogen-containing organic compounds