Sword holes - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 12 Old 11-02-2009, 10:26 AM
Originally Posted by aaronnorth View Post
I am not sure of the figure, but the levels in our aquariums are too low to have an effect on another nutrient. I have never heard of too much K restricting iron uptake anyway.... only Mg and Ca uptake are affected.
I agree. None of my plants have ever shown any signs of iron uptake being inhibited by K. My quote shows that there is actually a luxury uptake of K, ready for the growing season.

If my plants were looking sorry for themselves, it would look at my own methodology that I look at, rather than blame poor old potassium.

I certainly wasn`t expecting a figure as to how much potassium is required to inhibit iron uptake as I doubt that there is one, but a link to some text describing the theory would be nice.

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post #12 of 12 Old 11-02-2009, 07:45 PM
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Originally Posted by Jack Middleton View Post
A gram of KH2PO4 every 2 days, will provide approximately 3.9ppm of potassium, In terrestrial plants excess K can and will block active iron transportation, but in the aquarium levels of 3.9ppm simply isn't high enough to restrict the uptake, and their is no scientific evidence to suggest that it will block iron intake, In another post you said that when you dosed high levels of K you noticed that Iron wasn't being up taken by the plants, This will more than likely have been caused by Magnesium, Zinc and Copper, which in excess levels will restrict iron uptake.

Adding a gram every 2 days will need to be followed by a 50% water change at the end of the week.
In Aunt kymmie's situation, it was solely potassium that was overdosed, no other nutrients. And my surmise, which turned out to be correct, came from information I had read on one of the plant forums. I'm honestly not sure which one it was now, belonging to more than 7 forums I find it difficult to keep track. And we are talking low-tech, not high-tech in all this. Mr Barr is correct to point out that his EI system is better applicable to high tech aquaria.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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