There are many things in life that we take for granted, such as the sun rising in the east and setting in the west, April 15 being tax day and a salesman showing up just before you were wanting to leave early for the day! There are also some things in the world of crop production we take for granted — it will be hot in August and the weather forecast modules are always wrong after we mow hay.
Crop nutrients can be taken for granted as well, with oxygen being one of those. Growers spend considerable amount of time talking and managing nutrients such as N, P and K (and if we are in a really risky group we may whisper the words boron and zinc). But to bring up oxygen at the coffee shop as a vital nutrient we should manage — that will reward you with the bill.