So if I am understanding this story, some people found a correlation and mistook it for causation. An obvious no-no, albeit a easy trap to fall into. That's a

So if I am understanding this story, some people found a correlation and mistook it for causation. An obvious no-no, albeit a easy trap to fall into. That's assuming what you were looking for was a handle on how you could get more or less of whatever it was you wanted. But if you just wanted a diagnostic, then the data is telling you that the nitrogen content is (in practice) such a diagnostic. Depending on what you already knew, that might or might not be interesting or useful, but it is hardly nonsense.