One thing I like about Wikipedia, in general, it has its own built in checks & balances, at least for all who choose to participate. I like that better than reading slanted views on any topic.I work in an English department at a major university and we do a lot of research and analyze the research of others.
Wikipedia CAN be helpful, but please dont rely on it as your only source. It is often flawed and incomplete or somtimes even misleading.
add to that that plants consume ammonia preventing spikes.Just for (my) practice, here's a 2-sentence explanation/tutorial of the nitrogen cycle.
The nitrogen cycle removes deadly ammonia by using bacteria that oxidize it to nitrite which is oxidized by another type of bacteria into nitrate which is removed by water changes.
To cycle a tank (with fish-in) change 50% of the water every week or whenever ammonia or nitrite rise above 0.25ppm...whichever comes first.