Everyone is a geek of something or another. For me, it's plants.
I do think it is imperative though, that if one is writing an article that others may look at as "gospel" truth, the writer needs to base his concepts on more than just what he thinks, unless he presents his ideas as personal thoughts from the beginning.
I learned the essential nutrients as primary (N,P,,K), secondary (S,Ca,Mg) and trace nutrients (the rest). Or macro, intermediary and micro nutrients.
There certainly are instances where plants require selenium and/or silicon for health, but they are not part of the essential nutrients for all plants.
