PMDD and target levels of minerals - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 04-09-2008, 09:58 PM Thread Starter
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PMDD and target levels of minerals

PMDD has a formula like this; Mg:1,5% - Fe:7% - Mn:2% - Zn:0,4% - Mo:0,06% - B:1,3% - Cu:0,1%

i can't understand the percetages of these minerals. What is the total weight or measurement for the ratio? How can i make this mix. truely? And what must be the target levels of these minerals in planted tanks?

Thanks....
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post #2 of 8 (permalink) Old 04-09-2008, 10:16 PM
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the Fe looks high.

http://www.thekrib.com/Plants/Fertilizer/pmdd-tim.html

this thread should be in water parameters or general tank forum.


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post #3 of 8 (permalink) Old 04-10-2008, 09:43 AM Thread Starter
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What must be the target levels of each minerals in the planted tank then?
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post #4 of 8 (permalink) Old 04-10-2008, 02:43 PM
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Quote:
Originally Posted by tayfun View Post
What must be the target levels of each minerals in the planted tank then?
It depends.

Nutrients alone do not grow plants.

CO2/Light, plant type, other sources such as the sediment, the fish waste , algae eaters all play much larger roles in some/all cases.

So you need to ask more questions, how much light, what is the goal of the tank, do you want CO2 and faster growth etc.

Only then can you start thinking about levels really.

A residual level(ppm's etc) in the tank is really not telling if the plant gets enough to be semi limited or non limited for growth.

You could add ferts 3x a day at very low levels, or add them 2x a week at high levels, or none at all with a non CO2, maybe once every 2 weeks etc

If you have rich nutrients in the sediment, no really dosing at all.
PMDD is about 13 years old or so. Folks used very low light and lower CO2 back then.

So they use less nutrients/CO2 etc.

We also add a lot more PO4 today.

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Tom Barr




Regards,
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post #5 of 8 (permalink) Old 04-10-2008, 02:56 PM Thread Starter
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i use CO2 and have about 1 watt per liters light. i need to know the target levels of the nutrients. so i want to make a DIY Fertilizer.
Thanks...
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post #6 of 8 (permalink) Old 04-10-2008, 04:34 PM
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here's a fertilizer calculator for you to use
http://www.csd.net/%7Ecgadd/aqua/art...osage_calc.htm

in your low light situation, just keep the dosing low.
NO3 - 1-5ppm
K - 5ppm
PO4 - 1-4ppm
micros really low.
You might not need CO2 but it wouldn't hurt.


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post #7 of 8 (permalink) Old 04-10-2008, 07:52 PM
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1 watt/liter, so about 3.8 watts/gal, high light.

Typical EI will provide non limiting levels.

If you apply ppm's to advice:

This assumes that the poster can even measure accurately and has the skills and the testing equipment do that. Most, 95% or more do not.

If so, then you can use a pretty old article I wrote in 1997:
http://sfbaaps.org/articles/barr_02.html

You can raise the NO3 to about 20ppm, PO4 to about 2 ppm and forget Fe entirely. There are many issues with measuring Fe in the water column.

I'd suggest dosing at about 5mls per 70 liters using Tropica aquatic plant care(trace element mix) and if you wish, add some SeaChem Flourish at 2 mls 2x a week.

This will add plenty of traces for the tank even with high levels of biomass and fast growth rates.

You will find residual measures in the tank's water column do not correlate well to the plant's growth rates. Some seem to assume that it does and rush to judgment and make poor assumptions.

pH/KH can play tricks on you also.
So focus on CO2 a great deal.

This routine will provide non limiting levels of nutrients without the test kit method:

http://www.barrreport.com/estimative...chy-folks.html

More in depth:
http://www.barrreport.com/estimative...test-kits.html

I also believe there are a few folks in Turkey that have a plant aquarium site.
Might look around.

Regards,
Tom Barr




Regards,
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post #8 of 8 (permalink) Old 04-11-2008, 04:51 PM Thread Starter
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Thanks for all your replies. i will study on these.
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