Should iron be considered a macro nutrient?

[JoeQ]

I've seen some great results from adding more iron. Why then is iron considered a micro element, shouldn't it be considered a macro? 

[colo3000]

Macronutrients and micronutrients are named this way because plants require far less iron (micronutrient) for example than nitrogen or phosphorus (macronutrients). It's not that macronutrients are required and micronutrients are optional. Both are required for a plant's processes. It is just the amount that plants require that separates the two.

[Seattle_Aquarist]

+1 @colo3000's comment!

[Torrey]

Same goes for people 😁