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Fertilizer dosing math

Discussion in 'Aquatic Plant Fertilization' started by Petex, Nov 4, 2013.

  1. Petex

    Petex Member

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    hi,
    I have a question, a liquid fertilizer is labeled:
    Composition (ppm): K – 27.000, N – 11.200, P – 1.000

    Ok, how much will 1ml add in a 50L tank?
    0,001l x 27.000ppm / 50l = 0,54ppm K
    0,001l x 11.200ppm / 50l = 0,224ppm N x 4,43 = 0,99ppm No3
    0,001l x 1.000ppm / 50l = 0,02ppm P x 3.06 = 0,06ppm Po4


    Is the math I am doing right with the Po4?
    (I ask this, because Wets nutrition calculator results in much higher Phosphate levels for Vimi all-in-one)
     
    #1 Petex, Nov 4, 2013
    Last edited by a moderator: Nov 4, 2013
  2. Petex

    Petex Member

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    hmm, really no one here :confused: - who knows this?
    I am asking this, because off the "yet another nutrition calculator" screenshot.

    I am ending up with my Vimi Po4 math @0,06ppm
    But wets calculator says 0,6ppm Po4

    So, whats at lat right and wrong?

    wet-vimi.jpg
     
    #2 Petex, Nov 7, 2013
    Last edited by a moderator: Nov 7, 2013
  3. Tom Barr

    Tom Barr Founder
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    There are some weird old archaic terminology with respect to Fertilizer labels. This is unfortunate, but........like the infernal English system of measure.........it is what many still adhere too.
    Metric and mg/L, moles and such= much better.

    Here's an agricultural calculator:


    http://www.agry.purdue.edu/turf/fertilizercalculator/index.html

    Another explanation

    http://www.ipm.ucdavis.edu/QT/lawnfertilizingcard.html

    http://apps.rhs.org.uk/advicesearch/profile.aspx?pid=451

    Etc,

    Basically K2O and P2O5 are the conversions that are needed.
     
  4. Tom Barr

    Tom Barr Founder
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    There are some weird old archaic terminology with respect to Fertilizer labels. This is unfortunate, but........like the infernal English system of measure.........it is what many still adhere too.
    Metric and mg/L, moles and such= much better.

    Here's an agricultural calculator:


    http://www.agry.purdue.edu/turf/fertilizercalculator/index.html

    Another explanation

    http://www.ipm.ucdavis.edu/QT/lawnfertilizingcard.html

    http://apps.rhs.org.uk/advicesearch/profile.aspx?pid=451

    Etc,

    Basically K2O and P2O5 are the conversions that are needed.
     
  5. Petex

    Petex Member

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    Tom, thank you - unfortunatly it is too difficult for me to understand those Turf fertilizer with lbs (don´t know this measure unit in europe?)

    The thing I still see on Wets calculator is, that we both end up at last at very similar results - just with a (,) comma difference.
    He says 0,6ppm, I am ending up at 0,06ppm.

    So this means in one math the comma must be wrong.

    And I think is not bad too ask, if the calculator is right or not
    (because if I remember right we had in past a very similar discussion about some weird/different Easy Life Profito results from Wets and AR calculator. And one calculator was wrong there, too. )
     
    #5 Petex, Nov 7, 2013
    Last edited by a moderator: Nov 7, 2013
  6. Tom Barr

    Tom Barr Founder
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    Haha, yes, the damn English system of weights, %.
    The English Language is a whole other level of pain on top of that.

    1lb - 454 grams.

    You might forward the bug issue with Wet's calculator directly to him, it's not about being rude, it's all about fixing the issues.
     
  7. Tom Barr

    Tom Barr Founder
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    Haha, yes, the damn English system of weights, %.
    The English Language is a whole other level of pain on top of that.

    1lb - 454 grams.

    You might forward the bug issue with Wet's calculator directly to him, it's not about being rude, it's all about fixing the issues.
     
  8. Petex

    Petex Member

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    Yeah, languages, measure units - all those things are very difficult stuff.:D

    Where can I forward any bug issues?
    (I have not found any email or bug formular on the calculator website)
     
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