This site is supported by the advertisements on it, please disable your AdBlocker so we can continue to provide you with the quality content you expect.
  1. We are after as many aquarium plant images that we can get, doing so will assist us in completing the aquarium plant database.

    https://barrreport.com/threads/aquatic-plant-images-wanted.14374/
    Dismiss Notice

Calcium Gluconate Uptake Issues

Discussion in 'Aquatic Plant Fertilization' started by Deanna, Nov 7, 2018 at 6:34 PM.

  1. Deanna

    Deanna New Member

    Joined:
    Aug 23, 2018
    Messages:
    13
    Likes Received:
    3
    Local Time:
    11:37 PM
    Over on TPT, a member made a comment about the gluconate form of Ca having a larger molecule than, perhaps, other Ca salts. The implication seems to have been that the larger molecule somehow affects Ca uptake by plants.

    Can anyone comment on this?
     
  2. Phishless

    Phishless Lifetime Member
    Lifetime Member

    Joined:
    Jul 13, 2017
    Messages:
    853
    Likes Received:
    806
    Local Time:
    11:37 PM
    It is almost 3x the molar mass of gypsom(CaSO4).
    Yes a more complex molecule.C12H22CaO14
    Does it break down as easily and available for plant uptake?
    Don't know if the carbon in it would be available for plants either.

    If the target was for Ca you'd use a lot of it.

    Interested in further comments.
     
  3. Deanna

    Deanna New Member

    Joined:
    Aug 23, 2018
    Messages:
    13
    Likes Received:
    3
    Local Time:
    11:37 PM
    That ...is the real question. Hopefully, someone, here, will know the answer. My understanding is that it does break down much more easily than CaSO4, but what about that plant uptake aspect?

    As far as dosing is concerned, you do need about 3x the amount of Ca gluc to match that needed for CaSO4. However, the Ca gluc is much more soluble, making it much easier to mix-up in small containers.
     
  4. Phishless

    Phishless Lifetime Member
    Lifetime Member

    Joined:
    Jul 13, 2017
    Messages:
    853
    Likes Received:
    806
    Local Time:
    11:37 PM
    Calcium gluconate is also listed as a phosphate binder, would this affect macro nutrients? CaHPO4 formation?
    Also no real solubility data that I've found, just listed as slowly???
    At least CaSO4 has a listed solubility.

    Damn I wish I was a chemist sometimes. :D
     
  5. Deanna

    Deanna New Member

    Joined:
    Aug 23, 2018
    Messages:
    13
    Likes Received:
    3
    Local Time:
    11:37 PM
    I believe that Ca, regardless of the salt form, will bind to phosphate to some degree. I've been using ca gluc for quite some time and can tell you that it is more soluble at higher ppm's than CaSO4.

    I'd prefer it if you would wish yourself to be a biologist specializing in hydroponics. A chemist isn't going to be able to tell us about the uptake aspect of Ca gluc.
     
  6. rajkm

    rajkm Article Editor
    Staff Member Lifetime Member Article Editor

    Joined:
    Sep 16, 2015
    Messages:
    624
    Likes Received:
    189
    Local Time:
    4:37 AM
    Ca, is Ca. The atomic mass of Ca is 40.078 and no matter what the molecule is made of , the Atomic mass remains same.
    Gluconate is a complex which keeps the Ca bound but not as strongly as chelates.
    Calcium has strong affinity to a lot of chelates.
    Most likely what’s happening is as soon as the Gluconate complex is broken, any chelate available within water might be tying up the Ca. This is just a hypothesis but only further analysis can confirm.
    Actually plants easily take up Gluconate as such because it’s a carbon complex (sugar) which plants do uptake (the idea behind excel).
     
  7. Deanna

    Deanna New Member

    Joined:
    Aug 23, 2018
    Messages:
    13
    Likes Received:
    3
    Local Time:
    11:37 PM
    Thanks @rajkm. You confirmed what I thought about the Ca being Ca, regardless of how it's presented. I've also seen debates over NO3 being different than NO3, which also never made sense.

    So, any binding (which was not my initial concern), is simply due to the 'bad' chelates introduced from our micros, be it EDTA, DTPA HEEDTA, etc. In my case, that's even less of a concern because I mix my own traces and use Fe gluc.

    Your statements raise a different concern, though. With the Ca being made available much more quickly from the gluconate separation, maybe it would be better (although probably not noticeable) to add a small amount of Ca gluc daily, along with my Fe gluc and other traces, rather than front loading it in my RODI water weekly. Just looking for a 'best practice' approach and thinking out loud. Do you see any problem putting Fe gluc and Ca gluc into a dosing solution long term (months)?
     
    #7 Deanna, Nov 8, 2018 at 7:51 AM
    Last edited: Nov 8, 2018 at 8:00 AM
Loading...

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice