DIY Potassium Nitrate Calculating - The Planted Tank Forum
Old 05-11-2015, 01:33 PM Thread Starter
Algae Grower

Join Date: Jun 2011
Location: TURKEY
Posts: 6
DIY Potassium Nitrate Calculating

Hi,

I bought potassium nitrate that produced for agriculture. (13.0.46) N:%13 P:%0 K:%46

The molar mass is this fertilizer here; http://www.convertunits.com/molarmass/KNO3

I added 100gr in 1000ml water. And I added 10ml from this solition to my 50lt aquarium. I calculated like this;

For potassium
10 ml water contain 0,3867 gr potassium
PPM = (50.000g/0,3867) x 1.000.000
PPM = (0,000007734) x 1.000.000
PPM = 7,73 (This is true.)

For Nitrate
10 ml water contain 0,1385 gr nitrate
PPM = (50.000g/0,1385) x 1.000.000
PPM = (0,00000277) x 1.000.000
PPM = 2,77 (This is false)

So, I added %13 N and %46 K. But, The James' Planted Tank web pages calculate differently . Dou you know anything for this difference?

Thank you very much.
fatihsahin07 is offline

Old 05-12-2015, 02:25 AM
Planted Tank Obsessed

Join Date: Jan 2015
Posts: 385
The mistake I see is using the mass of Nitrogen (N), rather than Nitrate (NO3).
The molar mass of Nitrogen is 14.0067, or 13.85% mass of KNO3.
The molar mass of Nitrate is 62.0049, or 61.33% mass of KNO3.

So when you use 61.33% instead of 13.85%, you get the correct 12.26ppm NO3 (which matches James).
imcmaster is offline
Old 05-12-2015, 02:58 AM
Planted Tank Guru

Join Date: Jun 2008
Location: Seattle, WA
Posts: 6,591
Hi

http://www.aquaticplantcentral.com/f...fertilator.php

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75 Gallon, 2X55W AH Supply CF 8800K, 1X 59W Fluval Plant (3.0); 45 Gallon Tall, 1X 46W Fluval Plant (3.0); 30 Gallon Long; Fluval F&P 2.0; 20 Gallon, 1X26W AH Supply LED; all with CO2 & (Calcined) Montmorillonite Clay
Seattle_Aquarist is offline

Old 05-18-2015, 05:28 AM Thread Starter
Algae Grower

Join Date: Jun 2011
Location: TURKEY
Posts: 6
Thank you very much.
fatihsahin07 is offline

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