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Nh4+ Vs No3-

Discussion in 'Estimative Index' started by barturas, Jan 4, 2019.

  1. barturas

    barturas New Member

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    Hello, just thinking about mixing my own NKP.
    I want to try to add some NH4NO3 along with KNO3, but wanted to know how should I calculate the real equivalence of NH4 to NO3. I use to make NPK without NH4 and usually had a dose, let's say single spray, adding 0.5ppm of NO3 to my aquarium. N in NO3 is only 23%, so that means I actually add ~0.12ppm of N.

    In case of adding NH
    4, N is about 78%

    Based on
    barr report analysis of ADA Brighty Special Lights (sorry no links are allowed for me yet but could be found googling "ada green brighty composition") N coming with NO3 ~1003.4 ppm (average NO3 readings 4362.5ppm x 23%) and N coming with NH4 ~671 ppm (average readings 860 ppm x 78%) so tham means that 40% of all N is coming with NH4.


    My questions are: has anyone any experience mixing NPK not only from KNO3 but also with NH4NO3 ?

    Is my evaluation of overall N accessible to plants correct and logical?
     
  2. KeeperOfASilentWorld

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    Quoting BarrReport's article "Nitrogen Cycling in Planted Aquariums":

    "NH4+ preference was observed at levels between 2.0 to 0.5ppm and NO3- preference when the NH4+ is less than 0.5ppm. At 0.1ppm NH4+, no NH4+ is removed in the presence of NO3-."

    "There is a strong relation of high dissolved oxygen with low NH4+, allowing bacteria to oxidize the NH4+ and compete with the microphytes for this nutrient. Overloading with NH4+ produces a microphyte bloom. Adding high oxygen levels with pure oxygen did not prevent the microphyte green water algae bloom when NH4+ (at 0.5ppm) was dosed (Barr, 2003)."

    "Having some fish waste or other sources of low level NH4, but not enough to stop NO3 uptake seems to be the best approach."
     
    #2 KeeperOfASilentWorld, Jan 4, 2019
    Last edited: Jan 5, 2019
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