PMDD Water Ratio - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 11-18-2011, 06:56 PM Thread Starter
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PMDD Water Ratio

I got a pound of PMDD mix that contains:
pound of PMDD mix. its a micro macro fertilizer all in one.

one part of each of the following fertilizers.
potassium nitrate
potassium sulfate
Plantex CSM+B
magnesium sulfate

Can anyone tell me how much PMDD and water to mix in a 500ml bottle? I have found that 25 grams into the bottle but How much if I can't measure 25 grams. If anyone can tell me in teaspoons or tablespoons that would be great.
Thanks.
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post #2 of 9 (permalink) Old 11-19-2011, 03:48 AM
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25 grams should work out to about 4.4tsp. doesn't seem right unless you're shooting for target ppms per dose and you've done the math.

4 tblsp is more like it.

Last edited by dundadundun; 11-19-2011 at 04:01 AM. Reason: doh...
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post #3 of 9 (permalink) Old 11-19-2011, 07:41 AM
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http://www.theplantedtank.co.uk/PMDD.htm

this is a helpful site. these are the ratios i use, plus 10% more mono potassium phos. to avoid that gsa. i see that you are lacking... hm... you might consider buying a bit of it. pmdd works good, but works better imo with P in it too.

ok measuring in volumes is hard if you are only making up a 500ml batch. It's like comparing a cup of rocks to a cup of feathers. You *really* want grams, or else you risk imbalances. You can google the weight of a tbs of chemical X, and calc from there, but... there are a lot of cheap scales you can buy off of ebay for maybe 10$. I got one for 6$, and it is def worth it.

Also i suggest you mix the csm b separately and keep that in a dark bottle in your fridge.
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post #4 of 9 (permalink) Old 11-23-2011, 05:35 PM Thread Starter
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Quote:
Originally Posted by aweeby View Post
http://www.theplantedtank.co.uk/PMDD.htm

this is a helpful site. these are the ratios i use, plus 10% more mono potassium phos. to avoid that gsa. i see that you are lacking... hm... you might consider buying a bit of it. pmdd works good, but works better imo with P in it too.

ok measuring in volumes is hard if you are only making up a 500ml batch. It's like comparing a cup of rocks to a cup of feathers. You *really* want grams, or else you risk imbalances. You can google the weight of a tbs of chemical X, and calc from there, but... there are a lot of cheap scales you can buy off of ebay for maybe 10$. I got one for 6$, and it is def worth it.

Also i suggest you mix the csm b separately and keep that in a dark bottle in your fridge.
Thanks you but everything came premix in a bag. So far I mixed 1/4 cup of the mix to 2 cups of water. Looks greenish yellow when mixed. I found that here:
http://www.aquariumfertilizer.com/in...ion1=infopage3
Thanks,
Navy
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post #5 of 9 (permalink) Old 11-24-2011, 10:54 PM
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4tbsp = 1/4 cup

2 cups (1 pint) is the U.S. equivalent to 1/2 liter (500ml)

2 cups = ~473ml to be more specific
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post #6 of 9 (permalink) Old 11-25-2011, 06:28 AM
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Quote:
Originally Posted by navyscuba View Post
I got a pound of PMDD mix that contains:
pound of PMDD mix. its a micro macro fertilizer all in one.

one part of each of the following fertilizers.
potassium nitrate
potassium sulfate
Plantex CSM+B
magnesium sulfate

Can anyone tell me how much PMDD and water to mix in a 500ml bottle? I have found that 25 grams into the bottle but How much if I can't measure 25 grams. If anyone can tell me in teaspoons or tablespoons that would be great.
Thanks.
Search PMDD the Krib, go to the source:

On line since 1994:
http://www.thekrib.com/Plants/Fertilizer/




Regards,
Tom Barr
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post #7 of 9 (permalink) Old 11-27-2011, 02:09 AM
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Originally Posted by plantbrain View Post
Search PMDD the Krib, go to the source:

On line since 1994:
http://www.thekrib.com/Plants/Fertilizer/
meh... still doesn't directly answer the question.

sears and conlin formula was a 1:1:2:1 formula by volume... with the 2 parts being k2so4. the formula the OP has is a 1:1:1:1 formula by weight.

seems to me to nearly match the sears and conlin formula he'd have to purchase a separate amount of k2so4. also seems to me that recent knowledge/wisdom suggests that with the dosing of kno3 and/or kh2po4, the extra k2so4 wouldn't be needed. if dosing both, it's likely none would be needed at all.

so 4 tbsp's seems to be right on par given the "formula" being used.

now to get some P in the mix. a little enema should do the trick given that k2so4 is in the mix already, no?

then he'd need a dosing calculator or a little math for P ppm's... https://www.plantedtank.net/forums/137172-post11.html

this may help clarify some of that... https://www.plantedtank.net/forums/241362-post14.html

here's chucks calculator... http://web.archive.org/web/200812170...t_aquacalc.htm

there are many others as well.
wet's calculator... http://calc.petalphile.com/
james' claculator... http://theplantedtank.co.uk/calculator.htm
and there's calculators on many planted tank sites and sites with planted tank sections.

for EI dosages, you'd shoot for 1-3ppm (or 1-6ppm for EI light [EI for dummies])

you can use my spreadsheet here for an easy reference if you'd like... http://www.filedropper.com/fleetenemadose this one you put in your target dose in ppm and estimated water volume in your tank and it spits out how many ml's of fleet you'd need.

now he can discretely sneak some fleet enema off the shelf at any local pharmacy and have a "well rounded diet".

*that file will only be downloadable for 15 days and you'll need open office or libre office calc. both programs are free and open source. i made the file on a linux pc so, it should be virus free.

if ever the need for added N, he could pick up some salt peter. (green light stump remover or spectracide stump remover)

if i'm a little off here, feel free to straighten me out, tom.
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post #8 of 9 (permalink) Old 11-27-2011, 02:57 AM
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Originally Posted by dundadundun View Post
meh... still doesn't directly answer the question.

sears and conlin formula was a 1:1:2:1 formula by volume... with the 2 parts being k2so4. the formula the OP has is a 1:1:1:1 formula by weight.

seems to me to nearly match the sears and conlin formula he'd have to purchase a separate amount of k2so4. also seems to me that recent knowledge/wisdom suggests that with the dosing of kno3 and/or kh2po4, the extra k2so4 wouldn't be needed. if dosing both, it's likely none would be needed at all.

so 4 tbsp's seems to be right on par given the "formula" being used.

now to get some P in the mix. a little enema should do the trick given that k2so4 is in the mix already, no?

then he'd need a dosing calculator or a little math for P ppm's... https://www.plantedtank.net/forums/137172-post11.html

this may help clarify some of that... https://www.plantedtank.net/forums/241362-post14.html

here's chucks calculator... http://web.archive.org/web/200812170...t_aquacalc.htm

there are many others as well.
wet's calculator... http://calc.petalphile.com/
james' claculator... http://theplantedtank.co.uk/calculator.htm
and there's calculators on many planted tank sites and sites with planted tank sections.

for EI dosages, you'd shoot for 1-3ppm (or 1-6ppm for EI light [EI for dummies])

you can use my spreadsheet here for an easy reference if you'd like... http://www.filedropper.com/fleetenemadose this one you put in your target dose in ppm and estimated water volume in your tank and it spits out how many ml's of fleet you'd need.

now he can discretely sneak some fleet enema off the shelf at any local pharmacy and have a "well rounded diet".

*that file will only be downloadable for 15 days and you'll need open office or libre office calc. both programs are free and open source. i made the file on a linux pc so, it should be virus free.

if ever the need for added N, he could pick up some salt peter. (green light stump remover or spectracide stump remover)

if i'm a little off here, feel free to straighten me out, tom.
Nope, not one bit, thanks for the additions.

Volume was used because many do not have scales etc.
Nor is being precise critical to dosing fortunately.
Back in the day, K+ was gold and they added it no matter what, it could do no wrong and more must be better.

Basically they where....larding it on.........and we do it still, but many give that a free pass.....but not N when it comes to larding it on.......... Both myself and Steve Dixon made a simple ratio prediction that showed it would be very tough to run a limitation for K+ using only KNO3 as a source.

This was based on many plant species' tissue analysis.

Some find extreme interest in ferts, ppm's and grams, ratios and all that, but it's actually not that critical or that precise/important, as long as you are reasonably close.

Keep it simple. Folks tend to have more success that way.




Regards,
Tom Barr
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post #9 of 9 (permalink) Old 11-27-2011, 04:47 PM
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Quote:
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Nope, not one bit, thanks for the additions.
absolutely!

Quote:
Originally Posted by plantbrain View Post
Volume was used because many do not have scales etc.
or... like me... i don't want to pull out the balance for every dose. i'm still not sold on digital. i'm of the camp that believes i can see a mechanical problem immediately, but months of electrical inaccuracies could happen without my knowledge less i constantly calibrate a digital scale. defeats the purpose of digital and digital scales usually instill complacency/laziness, IMHO. or maybe it was just the group i ran around with in my younger years?

now go ahead and ask me why i trust my multi-meter.

Quote:
Originally Posted by plantbrain View Post
Some find extreme interest in ferts, ppm's and grams, ratios and all that, but it's actually not that critical or that precise/important, as long as you are reasonably close.
mothers amazing fruit/veggie garden is certainly proof of that! she has no clue what she's winding up with in her soil after spraying miracle grow everywhere... just that if she does it 3 times in the growing season, everything's plump and juicy come harvest time. makes for a slew of good reading material, though. if only the laptop wasn't so hot on my lap on the john.

Quote:
Originally Posted by plantbrain View Post
Keep it simple. Folks tend to have more success that way.
1/4 tsp 3X's weekly works for me.
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