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post #1 of 7 (permalink) Old 11-21-2006, 03:02 PM Thread Starter
 
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Question Potassium?

If my phosphate levels are naturally between 1-2 ppm, am I correct in thinking that I should use Potassium Sulfate to raise my Potassium levels rather than Mono Potassium Phosphate?

Is there any Potassium added when using CSM+B Plantex?

Is there a test kit for Potassium?

Thanks.
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post #2 of 7 (permalink) Old 11-21-2006, 04:41 PM
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Quote:
Originally Posted by Lazy J View Post
If my phosphate levels are naturally between 1-2 ppm, am I correct in thinking that I should use Potassium Sulfate to raise my Potassium levels rather than Mono Potassium Phosphate?

Is there any Potassium added when using CSM+B Plantex?

Is there a test kit for Potassium?

Thanks.
You are correct, you would want to use potassium sulfate and/or potassium nitrate if you need nitrates too.

If there is any potassium in CSM it is very little, but most likely there is none.

There are test kits for potassium, but they are expensive. A lot of us just dose to around 20ppm K.
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post #3 of 7 (permalink) Old 11-21-2006, 08:59 PM
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You may derive the K+ from KNO3 in most all cases except some very high fish loading, high NO3/PO4 tap + low lighting/non CO2 etc.

Basically about 50-80% of your N needs to come from fish waste for a given growth rate tio require KCL, or K2SO4 dosing.

We placed K2SO4 in GH booster for this reason, as more will not do any harm.

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Regards,
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post #4 of 7 (permalink) Old 11-21-2006, 11:05 PM Thread Starter
 
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"Basically about 50-80% of your N needs to come from fish waste for a given growth rate tio require KCL, or K2SO4 dosing." (How does the quote function work? )

I am not sure I understand what you are saying here, and please excuse my poor chemistry. N = nitrates? KCL = ?

My nitrates typically run high, 20-40 ppm, and phosphates 1-2, so adding KNO3 or KH2PO4 is not really an option for me. With these levels, are you saying K2SO4 is or is not likely needed. I have noted some curling and deformity of some leaves (A. Reinickii), and my newly planted B. Japonica seem to be looking a bit transparent and losing a lot of leaves. I figure it is either a potassium or iron deficiency. Yes? No?

Thanks.
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post #5 of 7 (permalink) Old 11-21-2006, 11:45 PM
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With those kind of nutrient levels, all you really need to dose is Potassium(using potassium chloride(KCl) or potassium sulfate(K2SO4) and some sort of micro nutrient mix. You will need the potassium because you are not providing it via potassium nitrate(KNO3).
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post #6 of 7 (permalink) Old 11-22-2006, 05:25 AM
 
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if the new leaves are curly (maybe even transparent), you could have a ca deficiency.
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post #7 of 7 (permalink) Old 11-22-2006, 03:52 PM
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you want to put the quotation between the quote and unquote functions which are
[] [/]
include quote between symbols [] and unquote between [\]
and the quotation between the functions

such as
Quote:
thingee here
so it would look like [..quote..] quotation [\..unquote..] without the dots
and you can go "advanced" to preview post and see how it functions.

Mark

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