Originally Posted by KevinC
No, it isn't K2O (you already said it is only 40-some percent). Fertilizers express the potassium content as "K2O equivalent" - in other words, how much K2O you would need to have the same amount of potassium. This is analogous to the way we express KH and GH (both are CaCO3 equivalent).
There are several types of potash: muriate of potash is KCl, caustic potash is KOH, there is also K2SO4 and K2Mg2(SO4)3 - usually it is the KCl form. Unless the ingredients are listed, it may not even be safe to assume the stuff in the bag consists of only one compound!
Oh I see, my mistake!
I no longer have the box as I transfered the contents to better containers, so I cannot check these things (Will have to check out the box at B&Q next time I'm there!).
Compulsion, you are not taking aboard what Kevin is saying.... the Potassium available in the API mix, is in the form of Potassium Sulphate (K2
), but is stated in the list as K2
O equivalent for reference.
(btw, I used to use API Leaf Zone, but am now using Seachem Flourish)
Originally Posted by compulsion
from what i can gather (bear in mind im half insomniac and its about 6:25am here) K is present in both potassium chloride (KCl) and potassium sulphate (k2so4) and potassium oxide (k2o)...
K binded with chlorine produces KCL
K in sulphate form produces... well the sulphate
K in oxide is the term for an dissolved amount of K in water or something????
without being in a sulpahte form, nor binded with chlorine so its safe... and more easily taken up by the plants?
either way i dont think that k2o isnt good for the tank..
K is the chemical symbol for potassium. KCL (potassium chloride), K2
(potassium sulphate) and K2
0 (potassium oxide) are compounds
containing potassium and other substances (Chlorine
O is unstable (if you like; dangerous) and so you will not find it available commonly as fertiliser, but you will
see it quoted on the back of fertilisers as a reference "standard" by which all forms of potassium compounds can be quantified against.