During nitrification, plants create nitrogen compounds nitrogen is added to the atmosphere bacteria break down amonia into nitrogen ammonia is changed back into nitrate

During nitrification, ammonia is changed back into nitrate.

Nitrification is a three-step process of oxidation of ammonia. It is an aerobic process performed by small groups of autotrophic bacteria (Nitrosomonas, Nitrobacter).
First step- ammonia to hydroxylamine,
Second step-hydroxylamine to nitrite,
Third step-nitrite to nitrate.
Nitrification together with ammonification is part of a nitrogen cycle.

Mg is used to measure mass