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Dosing K2SO4 for Increased Potassium

Discussion in 'Aquatic Plant Fertilization' started by Crispino Ramos, Oct 10, 2011.

  1. Crispino Ramos

    Crispino Ramos Guru Class Expert

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    Is it a sound idea to use K2SO4 to increase the amount of potassium in the planted tank water column? If so, how is the mixture made - the amount of water plus the potassium sulfate.
     
  2. Biollante

    Biollante Lifetime Charter Member
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    Why Yes, Yes Indeed, I Have, Now That I Come To Think of It


    Hi,


    Potassium sulfate, K[SUB]2[/SUB]SO[SUB]4[/SUB] is a great way to get extra potassium, especially if you are using something other than Potassium nitrate for Nitrogen.:)


    Potassium is 44.8736 % of Potassium sulfate, so each teaspoon (~6.4-grams) will add about 7.59-ppm of potassium to each 100-gallons.:cool:


    Biollante

     
  3. Biollante

    Biollante Lifetime Charter Member
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    Forgot to Cheat


    Hi,

    Oops, forgot:eek: I said I was going to steal:rolleyes:, er, ah, well, base my answer on Wet’s amazing calculator, http://calc.petalphile.com/. :eek:


    Could not figure out how to get where I wanted so I entered the numbers that I knew and here is the screen capture.:cool:


    [​IMG]


    Biollante

     
  4. LoudCreature

    LoudCreature Prolific Poster

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    See Biollante Wet says 6.403g you said only 6.4g with a stupid squiggle.

    Iam ordering the 1150lbs of 10% DPTA iron for my 500-ml of 1% solution

    [​IMG]
     
  5. scottward

    scottward Guru Class Expert

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    Out of interest, why? What are you using for your N and P ?
     
  6. Crispino Ramos

    Crispino Ramos Guru Class Expert

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    I use potassium nitrate and potassium phosphate.
     
  7. nipat

    nipat Guru Class Expert

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    There is an idea to dose a bit higher K than N, in order to let plant use that excess K to burn N from fish waste.
    If you like the idea. So adding K from K2SO4 (or KCl) is sound.
     
  8. Tom Barr

    Tom Barr Founder
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    you will almost always run an excess K+ relative to either with usage of those 2 salts, and if you add GH booster after the water change....which is 50% by volume K2SO4 anyways........then it's really really unlikely to become limiting in any way with K+.
     
  9. Crispino Ramos

    Crispino Ramos Guru Class Expert

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    In other words, it's not necessary to use potassium sulfate since I use potassium nitrate and potassium phosphate. Therefore, I will use the potassium sulfate in lieu of the GH booster. Will the plants be alright?
     
  10. Crispino Ramos

    Crispino Ramos Guru Class Expert

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    If the ratio is - 6.403 grams K2SO4 to 100 gallons of water, how many grams are there to 10 gallons of water? Is it 0.64 grams?

    I would like to make a mixture of K2SO4 in 500 milliliters of water with 0.64 grams of K2SO4 per one milliliter. What is the ratio of K2SO4 in water - X grams of K2SO4: X milliliters of water?

    Thank you.
     
  11. Tom Barr

    Tom Barr Founder
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    Plants are fine.......if you have say over 75-80% of your total N coming from say.....a large well fed dicus load...then adding extra K+ might help............or where you do not wish to add extra GH.............but.........in AZ, the tap is generally sludge from the CO river.......and it's fairly hard with higher Ca++, but may NOT have much Mg, so add a little Mg to the trace mix you use. If you want to add equal amounts of MgSO4 and K2SO4 to the trace mix, this works well and is easy.

    That's what PMDD did 16-17 years ago.
     
  12. Crispino Ramos

    Crispino Ramos Guru Class Expert

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    I use RO/DI in water changes; I don't use tap water for the aquarium.
     
  13. Biollante

    Biollante Lifetime Charter Member
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    No Matter How Good the Lawyer You Cannot Beat the Laws of Physics,er Chemistry


    Hi,

    Yes, 0.64-gram per 10-gallons will raise the K[SUB][SUP]2+[/SUP] [/SUB]about 7.6-ppm.
    :)

    If you wish 500-ml solution that contains 0.64 grams⁄ml of K2SO4, you multiply 0.64 grams⁄ml K2SO4 X 500-ml that equals 320g K2SO4.

    • That means you would need to mix 320 grams of Potassium sulfate into 280-ml of distilled water that :rolleyes::confused:
    • my friend, is not happening. :gw
    • Since my outdated (but not that outdated) 86th Edition of the Handbook of Chemistry and Physics says that the best we can do at sea level, at 25C is get
    • 120 grams K2SO4 per liter of solution with distilled water.:(

    Time for plan “B”
    :gw
    Instead of 1-ml raising the K2+ 7.6-ppm per 10-gallons, add 1-ml per gallon. Since we know 320-grams would get us 1-ml per 10-gallons and since
    [SUP]320-grams K2SO4 [/SUP]⁄[SUB]10[/SUB] is 32-grams.

    Into 450-ml of distilled water add 32-grams K2SO4 mix thoroughly add enough distilled water to make 500-ml (~18-ml).
    :cool:

    Biollante

     
  14. Crispino Ramos

    Crispino Ramos Guru Class Expert

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    Thank you for the formula to to create a K2SO4 in water mixture with a ratio of 3.2 grams of K2SO4 per one milliliter of water. Dosing would be one milliliter of mixture per one gallon of tank water. Is this an initial dose per gallons of tank water during water change? How about the dosing thereafter?
     
  15. Biollante

    Biollante Lifetime Charter Member
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    What Do You Want?


    Hi,

    What are targeting or trying to accomplish?
    :confused: It is unclear to me.:eek:

    In the above each ml will raise the K[SUP]2+[/SUP] in 1-gallon about 7.6-ppm.

    If you are targeting an additional 15-ppm in 50-gallons of water then I would add 30-ml three times a week.
    :)
    A purist would add 33-ml 3 X week.:rolleyes:

    Biollante


     
  16. Crispino Ramos

    Crispino Ramos Guru Class Expert

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    My goal is to have a sufficient supply of potassium (7.6 ppm) for a densely planted tank - after a water change and between water changes.
     
    #16 Crispino Ramos, Oct 15, 2011
    Last edited by a moderator: Oct 15, 2011
  17. Biollante

    Biollante Lifetime Charter Member
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    Stuff, Stuff & More Stuff On Average---Occupy Something Against Greed & Stuff


    Hi,



    Then I would say the If you are targeting an additional 15-ppm in 50-gallons of water then I would add 30-ml three times a week ([SUP]4.6-ppm K2+[/SUP]⁄[SUB]dose[/SUB], [SUP]13.82-ppm K2+[/SUP]⁄[SUB]week[/SUB]), 33-ml 3 X week ([SUP]5.01-ppm K2+[/SUP]⁄[SUB]dose[/SUB], [SUP]15.2-ppm K2+[/SUP]⁄[SUB]week[/SUB]).:)



    Based on Wet’s nifty, really spiffy:D, the accumulation of fertilizers vs time and plant uptake” you end up with this (based on 5-ppm, 3 X week). :)


    [​IMG]

    Note that if you have high uptake, at least as defined by Wet (for the record, I think it is quite accurate) you will need to dose around 15-ppm per week to maintain 6-8-ppm daily.:cool:


    Biollante


     
    #17 Biollante, Oct 15, 2011
    Last edited by a moderator: Oct 15, 2011
  18. Crispino Ramos

    Crispino Ramos Guru Class Expert

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    Thanks for the calculation and background information - helpful in practical application.

    Quote - I hope we solve the problem before we leave. - Paul Erdos
     
  19. Biollante

    Biollante Lifetime Charter Member
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    We'll continue tomorrow — if I live.--Paul Erdos

    Hi,

    You are most welcome!
    :cool:

    Paul Erdos is one of my favorites...
    :)
    • It is not enough to be in the right place at the right time. You should also have an open mind at the right time.
      • My Brain Is Open : The Mathematical Journeys of Paul Erdos
    Biollante

     
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