phosphate & iron - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 12-25-2006, 10:00 AM Thread Starter
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phosphate & iron

hi

I've come across many opinions regarding dosage of KH2PO4 & micro's or iron.

that iron & KH2PO4 shouldn't be dosed together, same with micro's & KH2PO4.

is this a certain fact, or is it one of those religious things, that no one can agree on?

I dose via a autodoser, and I mix KNO3, KH2PO4, K2SO4 & micros all in the same bottle, and have done with it.
I see no apparent ill effects.

What do you believe?

85G ; 6x54W T5 ATI Powermodule
Co2 via 6Kg bottle ; Milwaukee SMS122 Co2 controller ; Co2 reactor
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¾ tsp KNO3 3x week
¼ tsp KH2PO4 3x week
¼ tsp K2SO4 1x week
20ml CSM+B 3x week
50% W/c
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post #2 of 7 (permalink) Old 12-25-2006, 05:24 PM
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It isn't a religious thing. The Fe does combine with phosphates when you mix them, but that just leaves the Fe as a precipitate laying on the substrate, where it is slowly available to the plants, but it doesn't remove the Fe from the tank. Like so much of what we do, there are several ways to do fertilizing, none of which is an absolute necessity.

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post #3 of 7 (permalink) Old 12-25-2006, 05:35 PM
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Mixing it all in an autodoser can leave the bound Fe lying as a precipitate on the bottom of the dosing bottles. Unless you've added a means to stir up the solution while you're dosing the Fe may not be entering the tank at all.

As for dosing PO4 and Fe in general, for me it's an asthetic issue as the precipitate forms as a milky white haze that can take hours to dissipate.

—Bill

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post #4 of 7 (permalink) Old 12-26-2006, 08:56 AM
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Quote:
Originally Posted by Symbiot View Post
hi

I've come across many opinions regarding dosage of KH2PO4 & micro's or iron.

that iron & KH2PO4 shouldn't be dosed together, same with micro's & KH2PO4.

is this a certain fact, or is it one of those religious things, that no one can agree on?

I dose via a autodoser, and I mix KNO3, KH2PO4, K2SO4 & micros all in the same bottle, and have done with it.
I see no apparent ill effects.

What do you believe?
I would dose everything except the trace mix/Fe together.
I'd also suggest you use Tropica Master grow/Advanced care etc in place of CMS.

Regards,
Tom Barr




Regards,
Tom Barr
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post #5 of 7 (permalink) Old 12-26-2006, 12:25 PM Thread Starter
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Any particular reason why you would omit traces in the autodoser?
as I stated, I see no ill effects. I dose no iron though.

85G ; 6x54W T5 ATI Powermodule
Co2 via 6Kg bottle ; Milwaukee SMS122 Co2 controller ; Co2 reactor
Flourite RED
_
¾ tsp KNO3 3x week
¼ tsp KH2PO4 3x week
¼ tsp K2SO4 1x week
20ml CSM+B 3x week
50% W/c
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post #6 of 7 (permalink) Old 12-26-2006, 04:52 PM
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Bill's comment is a very good one. It is one thing to dump all of the ferts into the tank at once, and an entirely different thing to dump them into a dosing bottle all at once. In the dosing bottle there is lots of time for reactions to occur, in high concentrations of ferts, and the precipitates would tend to just stay in the bottle when you dose. Sometimes conventional wisdom is based on good reasons - this, in my opinion is one of those times.

Hoppy
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post #7 of 7 (permalink) Old 12-26-2006, 05:04 PM
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Quote:
Originally Posted by Symbiot View Post
Any particular reason why you would omit traces in the autodoser?
as I stated, I see no ill effects. I dose no iron though.
It's easy to try, drip some phosphate solution, and some iron (like Flourish Iron) into your tank in the same area. I can see white stuff raining down.

If you don't dose Iron, there is no problem. If your micro solution doesn't contain iron, no problem. If your tapwater contains enough iron, or a low tech tank with slow growing plants not showing deficiencies, no problem.

However, if you need to dose iron and phosphates, mixing them together will not be a good idea. Just like you driving a car, cranking up the heat, and opening the windows on a cold winter night... if it works for you, great.


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