[editor-surveyor]

.
Only water soluable minerals can be added.

Most of the necessary minerals are not soluable.

Hydroponics is a joke at best.

[taxcontrol]

Which minerals required by plants, are not water soluble?

[zeestephen]

Re: “Most of the necessary minerals are not soluble."

OK.

So, what physical process moves the minerals from the soil into the plant?