Dosing KNO3 - The Planted Tank Forum
Old 03-04-2010, 12:10 AM Thread Starter
Algae Grower

Join Date: Aug 2009
Location: Jacksonville, FL
Posts: 77
Dosing KNO3

So I'm kinda confused about how much to dose. I was looking on the dosing calculator from Green Leaf, and I was wondering how you get the suggested amount of potassium into the aquarium without blasting it off the charts with NO3, or will that large amount not matter until the WC?

I have the 1000mL dispenser bottle and am looking to dose KNO3 in my 29g with a Nitrate of <5. Does anyone have a recommendation for the amount to dissolve in the bottle, or a site that can help me figure out how much more clearly?

Thanks,

Mike

The Swamp.....Where only Gators get out ALIVE!
McGornel is offline

Old 03-04-2010, 12:57 AM
Banned

Join Date: Nov 2003
Location: Burlington, NC
Posts: 5,009
Chuck has a simple to use fert calculator to make solutions like you want: http://csd.net/~cgadd/aqua/art_plant_dosage_calc.htm

The fertilator calculates the amount of NO3 and K in KNO3 whereas Chuck's calculator only calculates the NO3. (You can calculate the amount of K in a KNO3 dose. You multiply the ppm of NO3 by 0.63 to get the K level.)

from the fertilator: 0.895 grams in 29* gal of water = 5.00 ppm of NO3 and 3.15 ppm K (0.900 grams is 5.03 ppm NO3 and 3.17 ppm K)

* You might want to enter 25 gal instead of 29 gal in the calculators because this approximates the actual amount of water.

These two calculator should fix you up.

EHEIM PIMP #164
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Classic 2011, Classic 2213, Classic 2217, ECCO 2236, Pro II 2028, Liberty 2040, Liberty 2042

VICTOR PIMP #1
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
VTS253A-1993, VTS250B-580, VTS253D-320, HPT500-40-350-4M, SGT500-40-4F-DK
Left C is offline
Old 03-04-2010, 06:45 AM Thread Starter
Algae Grower

Join Date: Aug 2009
Location: Jacksonville, FL
Posts: 77
That's the calculator I was using. He says the recommended target for K is 15-20 ppm, and trying to keep the NO3 down around 5 while trying to reach that level is near impossible? Am I just missing something? Or is that extra NO3 to reach the required K not going to be a problem?

The Swamp.....Where only Gators get out ALIVE!
McGornel is offline

Old 03-04-2010, 08:53 AM
Planted Tank Guru

Join Date: May 2007
Location: SoDak
Posts: 10,732
You should use KNO3 for nitrate, and other sources for potassium. KNO3 should not be your only fertilizer. Chucks page give pretty good directions. All of the macros we use have K in them.
OverStocked is offline
Old 03-04-2010, 03:07 PM
Planted Tank Guru

Join Date: Dec 2003
Location: The swamp
Posts: 13,609
Quote:
Originally Posted by McGornel View Post
That's the calculator I was using. He says the recommended target for K is 15-20 ppm, and trying to keep the NO3 down around 5 while trying to reach that level is near impossible? Am I just missing something? Or is that extra NO3 to reach the required K not going to be a problem?
The advice is a bit dated and the cal is still there, but the advice should be modified.

I'd say 10-30ppm is a better target for NO3.
20-30ppm or thereabouts for K+, does not matter that much.

Above these are fine as well, but you are not getting much benefit from it.
Below, you can run into limiting levels of nutrients in some cases.

Light/CO2 are more important to consider.
Focus obsessive compulsive there, not with nutrients, add them/dose, be done with it.

Regards,
Tom Barr

Regards,
Tom Barr
plantbrain is offline
Old 03-04-2010, 05:26 PM
Planted Tank Guru

Join Date: Jan 2010
Location: Contra Costa CA
Posts: 11,721
My tanks seem to run to so much NO3 already that I do not need to dose much. Similar about the PO4.
The amount of K that I get when I dose the proper levels of these for N and P is so little that I do not count it as a real source of K.

I use K2SO4 for potassium, and I dose a lot of it. My test: The plants do not have holes in the leaves when there is enough K in the tank.
Diana is offline
Old 02-17-2011, 06:10 AM
Planted Member

Join Date: Oct 2005
Location: Seattle WA
Posts: 209
How much K2SO4 for a low light 15 watt on for 8 hours over a 10 gallon soft water tank (150 TDS) CRS tank, with no ferts and no CO2, but stuffed with moss, anubias nana petite and java fern 'Philippine'? I was thinking of starting off with a Smidgen 1-2x per week.

David
fitness2go is offline

 Tags None

Message:
Options

## Register Now

In order to be able to post messages on the The Planted Tank Forum forums, you must first register.

User Name:
OR