Multiple choice What do you call the process of conversion of ammonia to nitrite by microbes? Nitrification Nitrogen fixation Eutrophication Denitrification Reveal answer Fill a bubble to check yourself A Correct answer Explanation The process of conversion of ammonia to nitrite by microbes is called nitrification.The transformation of ammonia to nitrite is usually the rate limiting step of nitrification. Nitrification is an important step in the nitrogen cycle in soil.