Ok

Now this recipe have PO4~7g/l, NO3~37.2g/l (no need for higher accuracy).
PO4:NO3~1:5.3.
Suggested dosage 4-8ml per day by Tom gives PO4~2.6-5.2ppm PER WEEK in a 20gal (75L) tank.

You can also make a solution with a KH2PO4=5 grams as suggests EI as lower level for PO4 (PO4:NO3~1:10).

EI suggests rather high nutrient levels.
Lots of people regardless of system they used (EI, PPS-pro, ADA, their own or any combo) came to the routine for an average aquascapers tank with PO4 dosage ~0.5-1.5ppm per week, so dosage could be ~0.75-2.5ml per day for a 20gal (75L) tank.

Taking ADA’s tanks as an “aquascapers standard”, solution with KH2PO4 10 grams and KNO3 60 grams, for target level PO4~0.5-1.5ppm dosage will be:

60x30x36H cm (~60L) 4-12ml per week
90x45x45H cm (~160L) 12-34ml per week
90x45x60H cm high type (~200L) 14-42ml per week
120x45x45H cm (~200L) 14-42ml per week
120x45x60H cm high type (~280L) 20-60ml per week
180x60x60H cm (~560L) 40-120ml per week
(double dosage if you have made solution with KH2PO4 5 grams instead of 10)

Dose greatly depends on light intensity, plants species, whether you intentionally limiting plants grows with “peak method” of lighting and/or PPS-pro method: this gives less algae bloom in case of problems with CO2 etc, less trimmings = more stable composition...
but NEVER allows plants to run out of nutrients keeping main concept of Estimative Index's approach.

Personally I prefer to make a macro recipe equal in N and P to Seachem Flourish Nitrogen™ and Flourish Phosphorus™ (PO4~4.1g/l, NO3~66g/l) and use their rule of thumb on dosage.

Note for beginners: if you need to know dosage of ANY liquid ferts on certain compound, do this:
(Tank volume*, L x desired dose of compound, mg/l) / concentration of this compound in ferts, grams/L = week dose, ml
* water volume without gravel, decorations etc

If we talking on liquid dosing vs. dry ferts, I can say that in Europe cheap and reliable micro is JBL Ferropol 24 – 10ml costs $5. As dosage is just 1 drop for 50L per day it is VERY easy to dose, and runs ~1.25-2.5 month for a 180L (48gal) tank.
I guess Oliver Knott uses them long time ago and could give good comments on it.
There are also very economical Easy-Life® ProFito®.

You can easily skip JBL’s routine and do not by costly JBL Ferropol making DIY ferts by PPS-pro recipe of macro (PO4:NO3~1:10) with K and Mg.
Surely using “JBL Ferropol 24” is convenient when you using PPS-pro macro’s recipe, as this micro do not contain Mg and K.

Note: as soon as you placed ADA Aqua Soil in your tank, the system turns to quite different, so PO4:NO3 ratio and PO4 dosage in water becomes far LESS important.

(details in Russian on P and N dosing available at my Amania – sorry, it’s still under construction, use IE only)


naman