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Discussion Starter #1
Concentration of fert vs time vs plant uptake.There are several percentages of uptake ,from 90% ,to 25% ,and even no plant uptake.They keep increasing.
Does this refer to the levels of light ,or the specific parts of a day?

I selected ,just to test ,the weekly dosing of 10 ppm K using the low light/EI method. - this amount was recommended ,when I selected Flourish K :

To reach your target of 10 ppm K you will need to add 4 mL Flourish Potassium to your 20.0 L aquarium to yield ......

(note) 20 liters is the estimated water column ,not full capacity of my tank.
Water change - 30% weekly

I made a print screen too ,so people can understand better my question.
It's one of those questions ,I just don;t know how to ask properly ,I would appreciate every extra detail about this.
In general ,what should I follow on the chart?
help much appreciated ,thanx
 

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Discussion Starter #2
Ok ,let's try step by step....

How do I estimate my uptake?

As I imagine it ,Zero uptake must happen in the case of a limiter- not enough CO2 ,a lack of another nutrient ,or complete darkness.
25% uptake - is that low light and appropriate CO2/excel for low light?
50% uptake - low-medium light with appropriate CO2/excel for it?
75% uptake - medium-high light with appropriate CO2 - pressurised?
95% uptake - High light with pinpoint accurate CO2 ,pressurised ,of course?
 

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There's no way to reliably tell how much of certain nutrients are being used without measuring them. So for K, you'll need to test immediately after dosing, and each day afterward to see how much is being removed from the water column.
 

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Discussion Starter #4
There's no way to reliably tell how much of certain nutrients are being used without measuring them. So for K, you'll need to test immediately after dosing, and each day afterward to see how much is being removed from the water column.
Hi ,Socielo
K dosing was only an example ,I was just trying to figure out the chart.

I realise now that each tank has its own biomass size and variety ,hence nutrient need ,and also the competition between each species present in a specific tank.This can vary ,way beyond ,thanks for the heads up.

I imagined Estimative Index ,as dosing more than enough ferts for a tank that's packed with plants ,as many as you can squeeze in.

I have a Tetra PO4 drop test ,I will do one after dosing Flourish P.

I know I have 20ppm NO3 in my tap ,I will not dose it ,but I didn't know you can actually test K ,and that was the reason people always kept it in high ppm ranges ,just to make sure some will be left at the end of the week.

Which brand makes K tests ,at least worthwile ones ,not ultra-accurate?
 

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Discussion Starter #6 (Edited)
API has one. The likelihood of a K deficiency is pretty low if you are adding KNO3 and KH2PO4.
I started fertilising with Flourish K ,and Dennerle V30 for Fe+traces.It also contains K.I follow the EI/Low light concentrations provided by the calculator.
As long as I don't see pinholes in the leaves ,it means I'm good ,right?It's only K deficiency that manifests this way ,isn't it?
 
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