PMDD question

Phyroath

Phyroath

Senior knowledge seeker
Jan 30, 2008
351
0
0
55
Phnom Penh
Hi Everyone,

I have been using PMDD premix for a while now. I understand that there is no phosphate with premix so I order additional compounds - Barr GH booster, Phosphate and Plantex.

Kindly help how do I dose phosphate, dry or in liquid form?
 
Thanks MSJinkzd. I want to make liquid solution and dose in addition to PMDD premix. The Chuck's calculator suggests 1 ppm. Should I add it to PMDD premix to get a completed mix stock solution?
 
Phyroath said:
Thanks MSJinkzd. I want to make liquid solution and dose in addition to PMDD premix. The Chuck's calculator suggests 1 ppm. Should I add it to PMDD premix to get a completed mix stock solution?
Click to expand...


DO NOT add Phosphate to a PMDD solution, the phosphate and Iron will precipitate out of solution and become unavailable to the plants.

But they can be dosed on the same day, just wait a couple of hours after dosing PMDD.
 
Sorry for late reply. I would mix 3/4 teaspoon of phosphate with 1l distilled H2O however I am not sure how much should I dose. Per the label from aquarium fertilizer, the above result will be a solution of 0.3% P2SO4.
 
Sorry a typo. I have found the receipt by Tom Barr I noted down below.

A way to make 1.0, 2.0, 3.0, 4.0 and 5.0 ppm PO4 reference solutions:


  • Add 1.433 g of KH2PO4 to 1 L DI/RO water. This makes a 1000 ppm PO4 solution. (It's really a 1000.09 ppm solution.)


  • Add 1 mL of the 1000 ppm solution to 9 mL of DI/RO water. This makes 10 mL of a 100 ppm PO4 solution.


  • Add 2 mL of the 100 ppm solution to 18 mL of DI/RO water. This makes 20 mL of a 10 ppm PO4 solution.


  • To make a 1.0 ppm PO4 solution:
  • Add 1 mL of the 10 ppm solution to 9 mL of DI/RO water. This makes 10 mL of a 1.0 ppm PO4 solution.


  • To make a 2.0 ppm PO4 solution:
  • Add 2 mL of the 10 ppm solution to 8 mL of DI/RO water. This makes 10 mL of a 2.0 ppm PO4 solution.


  • To make a 3.0 ppm PO4 solution:
  • Add 3 mL of the 10 ppm solution to 7 mL of DI/RO water. This makes 10 mL of a 3.0 ppm PO4 solution.


  • To make a 4.0 ppm PO4 solution:

 
Reference solution (that you mentioned above) is a solution that is to be used to calibrate a test kit. this is not what you want to be using to make kh2po4 stock.

use this websites dosing calculator to help you make your stock.
http://www.csd.net/~cgadd/aqua/art_plant_dosage_calc.htm

Also, do you have a PO4 (phosphate) test kit? do you need to be adding additional phosphate? be careful when dosing phosphate because it can lead to algae if you have too muhc of it in there.

have a good day.
 
coach_z said:
Reference solution (that you mentioned above) is a solution that is to be used to calibrate a test kit. this is not what you want to be using to make kh2po4 stock.

use this websites dosing calculator to help you make your stock.
http://www.csd.net/~cgadd/aqua/art_plant_dosage_calc.htm

Also, do you have a PO4 (phosphate) test kit? do you need to be adding additional phosphate? be careful when dosing phosphate because it can lead to algae if you have too muhc of it in there.

have a good day.
Click to expand...

Really, and how much is that?
How careful, should I be?
I know plenty that are not careful, they had no issues, I didn't either.

This aquarium, which is in my home is dosed 5.53ppm 3x a week of KH2PO4, with sierra snow melt tap water, which is pretty much free of P and N, low KH, GH etc, like RO pretty much.

I dose 1 teaspoon to a 180gal tank 3x a week.
Has 2w/gal of light, excellent CO2 and current.
Weekly 60% water changes.

So that + large water changes and frequent rich dosing gives me a very stable high level of PO4, yet I trim and prune often, no algae etc.

redpan2.jpg


I also use ADA AS which is fairly rich in P in the sediment as well.

In otherwords, how can this possibly be true in and of itself when I test it, as well as many others, and we do not get any algae? You cannot explain why I and others lack algae with this hypothesis, therefore it must be rejected. The hypothesis that excess PO4 causes algae has to be rejected as a direct cause for algae.

Some like to have it both ways, claiming it can encourage algae but with the right balance(whatever that means/is etc), this too also fails. The "right balance" is really another reason for algae, not the PO4 directly.

It says the same thing and even suggest alternative cause(right balance, not PO4). Why not just come out with it and say it's not PO4, and something else instead? It cannot be directly PO4. I know of no excess level that causes any negative effects, so above a non limiting levels has no adverse effects, so it's really more an issue of waste and simply not needed, no fear required.

I dose PO4 dry, as my tanks are 60 Gal and up.
I dose a lot more than Chuck's cal which is over 10 years old these days and needs some updating on suggestions.

If you have 20 Gal or more, dry dosign is fine, if you like messy liquids, that's fine too, just have a trace mix and then a macro mix.

Main thing is to simply dose consistently and keep up on the gardening.
So if a daily liquid works, better, do that, if dry powders work better, do that.

It's not the method so much, it's you and human habits/lack of them that is the real issue. Sediment ferts adds a good back up also in you do forget or leave for a week vacation etc.






Regards,
Tom Barr
 
You must log in or register to reply here.
AquariaCentral.com
Top Bottom