Question about dosing K - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 11-30-2006, 11:34 PM Thread Starter
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Question about dosing K

I'm just wondering what most of you do for K.
Do you dose Kno3, KH2Po4, Fe, traces and that's it?
Or do you also dose K2So4?
I've been dosing the latter, but am starting to wonder if its even needed after reading some comments that other folks were using KNo3 for all their K dosing. Can you even overdose this if you're doing 50-60% water changes every 5-7 days? I'm just wondering what the majority of people do. Take into consideration that we're talking about a heavily planted tank(mostly stem plants) with high light and plenty of Co2 (3-4 bubbles/sec).

-Ryan

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post #2 of 4 (permalink) Old 12-01-2006, 01:01 AM
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Well, there's plenty of K+ from KNO3 relative to N, about 4x more than demand would suggest in a limiting situation where N was dosed barely above limiting vaslues.

So even if you had 75% of the total N from the plants from fish weaste, you'ld still be fine with respect to K+ if you add 25%KNO3 for the N for the tank.

Such cases are not possible really without adding so much NH4 that you start to get algae issues in a higher to med light tanks.

Obviously as you reduce the light, you reduce the N demand as you also reduce the growth rate and CO2 demand, thus the plant down regulates N demand and CO2 deamnd in response to light reduction.

This in turn allows more nutrients to come from the fish waste in lower light tanks that where much more common in the past and where many fertilizer routines are based upon and have not factored in the link between light and growth rates of plants sadly.

It may reflect more a belief based approach rather than one based on plant growth and science.

Regards,
Tom Barr




Regards,
Tom Barr
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post #3 of 4 (permalink) Old 12-01-2006, 02:08 AM Thread Starter
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Ok, so it sounds like if I had quite a bit of fish waste
(75% of total N), and I dosed say, 1/4 tsp KNo3 every other day -- I would be ok with my K level. I imagine that its even more exaggerated since I really don't have many fish (3 ottos, 4 rummynose tetras, 2 lamp eye killies), so total N from fish waste in my tank is probably more like 10% or less. If anything, the amount of N in relation to K would be low, right? I wonder if that's what gives some of my plants a yellowish tinge...not enough N.

-Ryan

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post #4 of 4 (permalink) Old 12-01-2006, 02:17 AM
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I add K (from no-salt) and KNO3.
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