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Signs of genuine macro nutrient deficiency

Discussion in 'Aquatic Plant Fertilization' started by scottward, Oct 14, 2009.

  1. scottward

    scottward Guru Class Expert

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    Hi,

    I'm not actually having any nutrient problems at all - just thought I would post this for the sake of discussion, to better my understanding.

    I've now learnt that it's usually a CO2 limitation that causes a whole host of problems, not an excess nutrient/not enough light issue as many books etc will have you otherwise believe.

    But for a moment lets flip this on it's head....

    Imagine we have an aquarium that is ticking along very nicely. Photoperiod is good, CO2 is non-limiting, nutrients are non-limiting (EI).

    Now, let's NOT dose any nitrogen.

    Given that Light, CO2 and other nutrients are good, what are the true signs of a nitrogen deficiency?

    Similarly, if we only hold off dosing Phosphorous what we be the expected signs of deficiency?

    And again for Potassium?

    Don't want to discuss micros (...yet). ;-)

    And, to keep things simple, lets assume there aren't any fish in the tank, so no fish food etc. Nutrients only come from EI dosing.

    Scott.
     
  2. Gerryd

    Gerryd Plant Guru Team
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    Hi Scott,

    I always think of it as a chain reaction as each of these elements work together to form other links in the chain.....

    I cannot answer your question but think you would need a rigorous control to ensure that the symptoms are 100% caused by the limitation of X nutrient.

    So if N is limited and it affects the K or P is it now more the reaction of the K or P that is more the cause, or the original reduction of N?

    I hope/am sure Tom will chime in for this one :)
     
  3. Tom Barr

    Tom Barr Founder
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    To address CO2 issues and other factors, many use hydroponics to address this test.

    You can find plenty of references for many plants done this way/method.
    Many deficiencies look similar and are different on different plants.
    Adding to that, no tables showing deficiencies I've ever seen.......include dissolved CO2;)

    It's(dissolved CO2) just not studied in an agricultural sense.
    But most aquarists simply glaringly overlook it.

    This is extremely short sighted.


    Regards,
    Tom Barr
     
  4. Philosophos

    Philosophos Lifetime Charter Member
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    As Tom said, there aren't any that include CO2. I've looked a long while for it.

    Here's where I refer to every now and then when I come across strange symptoms:
    Nutrient Deficiency

    I had another one that was agricultural, and while the pictures didn't always match, the description of what happened to the plants was excellent, even for trace elements. I wish I could find it again; if I do, I'll send you the link.

    -Philosophos
     
  5. baron von bubba

    baron von bubba Junior Poster

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  6. scottward

    scottward Guru Class Expert

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    Cool; thanks guys. I will have a read...
     
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