Eye of newt, and toe of frog, Wool of bat...
Potassium Nitrate, KNO3 (saltpeter) is 38.6% Potassium (K) and 61.4% Nitrate (NO3), water is “powerful” enough to separate the Potassium from the Nitrate, in this form they carry a formal charge so we write these forms as K+ and NO3-, the water is not “powerful” enough to separate Nitrate into Nitrogen and 3-Oxygen atoms.
KNO3 is a good source of Potassium and Nitrate for our tanks. When sold as fertilizer it has an NPK listing as 13-0-44, due to purity the KNO3 sold by most planted tank fertilizer may be 13-0-46. I am aware of one that lists the NPK as 13.2-0-46.5, I tested and found they were correct.
Potassium sulfate K2SO4 is 44.8% Potassium and Monopotassium phosphate, KH₂PO₄ (MKP), is 28.7% K+ and 69.7% Phosphate (PO43-).
Just find a method, I like the Estimative Index (EI), stick to the routine, observe the plants and everything will be fine.
Last edited by JoeRoun; 09-16-2014 at 07:14 AM.