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

U¿ytkownik "Philippe Lemaire (remove oldies)"
napisa³ w wiadomo¶ci
...
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


I think you nedd to add K in fresh water to reach 15 ppm K.
And if you will be add olnly to fresh warter to change you will be have
parmanent level of K.
Natyraly you can increase or decrease level of K.
I thing more is not nedd.

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.

--
Elaine T __
http://eethomp.com/fish.html '__
rec.aquaria.* FAQ http://faq.thekrib.com

Uzytkownik "Elaine T" napisal w wiadomosci
m...
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.

I dont think so.
The level of K is too low in tmg and cannot be accumulated using tmg in
recomendet dose.
Do you monitor your level of K ?

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

Andrzej Konarski wrote:
Uzytkownik "Elaine T" napisal w wiadomosci
m...
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.

I dont think so.
The level of K is too low in tmg and cannot be accumulated using tmg in
recomendet dose.
Do you monitor your level of K ?

Now I'm at about 55 mg/l of Potassium...
See other answer for more details !

Thanks !

Philippe

U¿ytkownik "Philippe Lemaire (remove oldies)"
napisa³ w wiadomo¶ci
...
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

Add kh2po4 only to fresh water to reach 1-1,5 ppm in water to change .
if you need more PO4 add some fish and do not add kh2po4 daily because K is
cumulating as you write.

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

Andrzej Konarski wrote:
U¿ytkownik "Philippe Lemaire (remove oldies)"
napisa³ w wiadomo¶ci
...
Elaine T wrote:

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

Add kh2po4 only to fresh water to reach 1-1,5 ppm in water to change .
if you need more PO4 add some fish and do not add kh2po4 daily because K is
cumulating as you write.


Thanks !

So no K enters in plants structure !?

Philippe

Philippe Lemaire (remove oldies) wrote:
Andrzej Konarski wrote:

U¿ytkownik "Philippe Lemaire (remove oldies)"
napisa³ w wiadomo¶ci
...

Elaine T wrote:


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

Add kh2po4 only to fresh water to reach 1-1,5 ppm in water to change .
if you need more PO4 add some fish and do not add kh2po4 daily because K is
cumulating as you write.



Thanks !

So no K enters in plants structure !?

Philippe


Again, potassium (K) IS assimilated by plants. It enters the stucture
of the plants, if that's how you want to say it. Are you sure of your
test results? Perhaps something else is accumulating in the water and
making your K test inaccurate.

--
Elaine T __
http://eethomp.com/fish.html '__
rec.aquaria.* FAQ http://faq.thekrib.com

Elaine T wrote:
Philippe Lemaire (remove oldies) wrote:

Thanks !

So no K enters in plants structure !?

Philippe


Again, potassium (K) IS assimilated by plants. It enters the stucture
of the plants, if that's how you want to say it. Are you sure of your
test results? Perhaps something else is accumulating in the water and
making your K test inaccurate.

Thanks again !

Is there some description of the standard plant composition ?
When leaves die, does K first return to water ?

Philippe

Potassium is not integrated into the plant strucure to any great
extent. Potassium is predominantly involved in ion channels. It
regulates potential across the cell membrane, providing energy for
cellular processes, maintaining osmotic pressure, etc. Take away
potassium and the cell's biological processes shut down. FWIW plants
actually have quite a high potassium demand, second only to nitrogen.
Andrew

Andrew wrote:
Potassium is not integrated into the plant strucure to any great
extent. Potassium is predominantly involved in ion channels. It
regulates potential across the cell membrane, providing energy for
cellular processes, maintaining osmotic pressure, etc. Take away
potassium and the cell's biological processes shut down. FWIW plants
actually have quite a high potassium demand, second only to nitrogen.
Andrew

So it acts like a catalyst ?
Is it the same for Ca and Mg ?
And Fe ??

Philippe

Andrew wrote:
Potassium is not integrated into the plant strucure to any great
extent. Potassium is predominantly involved in ion channels. It
regulates potential across the cell membrane, providing energy for
cellular processes, maintaining osmotic pressure, etc. Take away
potassium and the cell's biological processes shut down. FWIW plants
actually have quite a high potassium demand, second only to nitrogen.
Andrew

Define integrated. Remove a plant stalk, and you remove quite a bit of
potassium from the closed tank system. While potassium is mostly
cytosolic and not bound to protein, it is still intracellular (remember,
high Na+ outside, high K+ inside). That means it is sequestered from
the tank water and there is net uptake as plants grow. I believe that
is Philippe's essential question, since he is confused about the
accumulating potassium in his aquarium.

As for which nutrients leave a dead plant first, my best guess
(for the reasons stated above) is K, followed by N and P. As a general
rule, it is preferable to remove dead plant matter from an aquarium
rather than leave it to rot.

--
Elaine T __
http://eethomp.com/fish.html '__
rec.aquaria.* FAQ http://faq.thekrib.com

Elaine T wrote:
Andrew wrote:
Potassium is not integrated into the plant strucure to any great
extent. Potassium is predominantly involved in ion channels. It
regulates potential across the cell membrane, providing energy for
cellular processes, maintaining osmotic pressure, etc. Take away
potassium and the cell's biological processes shut down. FWIW plants
actually have quite a high potassium demand, second only to nitrogen.
Andrew

Define integrated. Remove a plant stalk, and you remove quite a bit of
potassium from the closed tank system. While potassium is mostly
cytosolic and not bound to protein, it is still intracellular (remember,
high Na+ outside, high K+ inside). That means it is sequestered from
the tank water and there is net uptake as plants grow. I believe that
is Philippe's essential question, since he is confused about the
accumulating potassium in his aquarium.

As for which nutrients leave a dead plant first, my best guess
(for the reasons stated above) is K, followed by N and P. As a general
rule, it is preferable to remove dead plant matter from an aquarium
rather than leave it to rot.

Your answer is mostly interseting although some words as cytosolic is not
used every day ;-)

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 :-(

I will try to remove floating leaves ASAP !

Philippe

Philippe Lemaire (remove oldies) wrote:
Elaine T wrote:

Andrew wrote:

Potassium is not integrated into the plant strucure to any great
extent. Potassium is predominantly involved in ion channels. It
regulates potential across the cell membrane, providing energy for
cellular processes, maintaining osmotic pressure, etc. Take away
potassium and the cell's biological processes shut down. FWIW plants
actually have quite a high potassium demand, second only to nitrogen.
Andrew


Define integrated. Remove a plant stalk, and you remove quite a bit of
potassium from the closed tank system. While potassium is mostly
cytosolic and not bound to protein, it is still intracellular (remember,
high Na+ outside, high K+ inside). That means it is sequestered from
the tank water and there is net uptake as plants grow. I believe that
is Philippe's essential question, since he is confused about the
accumulating potassium in his aquarium.

As for which nutrients leave a dead plant first, my best guess
(for the reasons stated above) is K, followed by N and P. As a general
rule, it is preferable to remove dead plant matter from an aquarium
rather than leave it to rot.


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.

--
Elaine T __
http://eethomp.com/fish.html '__
rec.aquaria.* FAQ http://faq.thekrib.com