The more potassium the paler the plants - why is this ??? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 07-13-2009, 05:14 AM Thread Starter
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The more potassium the paler the plants - why is this ???

I have very infuriating problem: the more potassium i add the paler colors my plants get. I add 2 ppm K daily from KHCO3. I had the same problem in my old tank. I know EI followers will tell me there is not enough PO4, NO3 or CO2 but it is NOT the case. I added heavy doses of NO3 and PO4 but without effect.
The symptoms on plants resemble iron deficiency but it looks somewhat different - all the new leaves are uniformly yellow while classic iron deficiency always caused leaves to be partly yellow (on most plants). When i decreased K doses the plants got better colors but they quickly showed K deficiency symptoms. I don't have issues with stunted tips or deformed leaves (which are commonly considered to be caused by excess K).
Of course i tried to add more iron and manganese (about 0.5 ppm Fe - water in the tank was slightly yellow due to dissolved iron chelate (DTPA) ). But it didn't work - chlorosis still existed. Did you have similar problem ?
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post #2 of 4 (permalink) Old 07-13-2009, 05:39 AM
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What about CO2 and light? You can add all the ferts you want but your plants will die without CO2 and light.


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post #3 of 4 (permalink) Old 07-13-2009, 05:56 AM Thread Starter
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The lighting is strong - 0.9W per liter. CO2 is ok, plants are heavily pearling. KH is 2 and pH 6.2.
I found some links that say the chlorosis i have on my plants may be caused by excess potassium:

http://cat.inist.fr/?aModele=afficheN&cpsidt=6694560
http://www.mortonarb.org/tree-plant-...chlorosis.html
http://www.rainbowtreecare.com/pdf/Chlorosis.pdf

I don't insist however, the issue is caused by excess K. There may be other reasons but i'm unable to find them...
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post #4 of 4 (permalink) Old 07-13-2009, 02:49 PM
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do you know your CO2 measurement?


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