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Availability of micro and macro from water PH

Discussion in 'Aquatic Plant Fertilization' started by borman, Feb 1, 2010.

  1. borman

    borman Prolific Poster

    Dec 29, 2007
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    11:43 AM
    I found an interesting table that shows the availability of micro and macro elements for plants, depending on the water PH.
    I am particularly interested in the dependence of PO4.
    Because I have a very low PH. (5,0-5,8) while I dose out quite a few phosphates (try to maintain a level of 1.0). And while I have GSA on my glass , and some plants show signs of lack of phosphate
    View attachment 1165
    any thought are welcome
  2. Biollante

    Biollante Lifetime Charter Member
    Lifetime Member

    Jun 21, 2009
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    11:43 AM
    More "P"


    While local dogma holds that pH is not relevant, I will offer my ever-humble plant opinion and wait for it to be corrected. :eek:

    I think that chart indicates what I have seen. In general, I take it to mean that at lower pH values we need to increase the ‘P’ (Phosphorous).

    Personally, I maintain a higher phosphate level. :)

    A ‘trick’ with GSA is at a water change, before refilling, scrape and wipe away as much as you can, credit card and toothbrush are handy. Take a phosphate solution (10-15 ppm) and squirt it on the glass wiping the glass and any expose surface down to the substrate, then refill. Another water change in two days is a good idea.

  3. Tom Barr

    Tom Barr Founder
    Staff Member Administrator

    Jan 23, 2005
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    11:43 AM
    In aquatic systems, it's likely better to focus more on KH, less on pH.
    There's some correlation obviously, but less KH will mean some things are better in solutions.

    Still, plants are pretty tough and adding CO2 helps them far more than terrestrial systems and tables such as the one above, most tables etc are not for aquatic systems, so you have to be careful and not use them or apply them without question.

    Tom Barr

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