Elaine T wrote:
Philippe Lemaire (remove oldies) wrote:
Then, it is merely a catalyst being in higher and higher concentration,
depending on water changes !?

Could anyone discuss this subject ?
The only K I add comes from TMG and little KH2PO4.
Nitrates come from Ca(NO3)2 and Mg(NO3)2...
P and N are stable from week to week but K is raising.

Thanks in advance !

Philippe


K is most certainly assimilated by plants. Perhaps your tapwater is
relatively high in K and the additional K from the TMG is too high of a
dose.

Thanks to both !

My tap water should be 0.64 mg/l
I add with KH2PO4 about 3 mg/l per week
I change 1/7 of the water every week

My current concentration is about 55 mg/l
If K+ is assimilated by plants, is it the first ion to leave
when leaves decompose ?

Thanks again !

Philippe