Which process involves the conversion of ammonia into nitrite ions?

The process that involves the conversion of ammonia into nitrite ions is nitrification. Nitrification is a crucial step in the nitrogen cycle, where ammonia, often resulting from the decomposition of organic matter or waste, is converted into more oxidized forms of nitrogen. This process occurs in two main stages: first, ammonia is oxidized to nitrite ions by ammonia-oxidizing bacteria. Then, nitrite is further oxidized to nitrate ions by nitrite-oxidizing bacteria. This transformation is vital for soil fertility, as it makes nitrogen available in a form that plants can readily absorb and utilize for their growth. Nitrification contributes to the overall nitrogen cycle by helping maintain the balance of nitrogen in the ecosystem.