To maybe give you some more Hints, let us look at it from a Different angle again ?
While the Plants "MUST" Have enough Phosphates to Cause the Plants to grow properly to Complex "ALL" of the Alkaline Minerals into the Plant, now what does the body need to be able to fully utilize this food ?
In other words there is one Alkaline Mineral which it does not need Lots of, but it needs enough to do the job !
For once the Plant has made the Foods , which now have Proteins and Carbohydrates etc in it, what is it which the Body "MUST" have to Regulate this Breakdown and Transfer of this food into Flesh and Bones in the body and keep it properly Regulated to Prevent the body from becomming too Acidic ?
Some more Hints: The air you Breathe may contain up to 70% Nitrogen and the Foods most people eat may have Nitrogen which needs to be Regulated by the body and the Excess needs to be gotten Rid of or the Excess may Cause the Body to become too Acidic !
What Alkaline Mineral is needed by the Liver and Kidneys to do this job ?
It does not take a Lot, but the body "MUST" have it each day !
Smile Tis your choice.