Is Potassium not assimilated by plants ?

Elaine T wrote:
Philippe Lemaire (remove oldies) wrote:
Your answer is mostly interseting although some words as cytosolic is not
used every day ;-)

"Cytosolic" means dissolved in the fluid on the inside of a cell. I was
trying to respond to both you and Andrew at the same time.

My main problem is to add Nitrates to keep the level at 30 ppm...
As therfore I add too much Ca or Mg. K comes mainly from TMG and KH2PO4.
If I increase waterchanges, I shall add still more nitrates :-(

Why are you keeping nitrates at 30 ppm? That's part of your problem!
Everything I've read suggests that 5-10 ppm nitates is preferable.
Here's an article on recommended dosing levels.
http://www.sfbaaps.com/articles/barr_02.html I don't even have problems
with nitrates below 5 ppm as long as I'm dosing every couple of days.

My GBA are quite calm since I moved from 15 to 30 ppm nitrates.
Presently, I already put some nitrates everyday not have higher instantaneous values.

Thanks for the help !

Are Ca and Mg cytosolic too ?

Philippe