Potassium nitrate for potassium deficiency.
Planted Tank Forums
Your Tanks Image Hosting *Tank Tracker * Plant Profiles Fish Profiles Planted Tank Guide Photo Gallery Articles

Go Back   The Planted Tank Forum > Specific Aspects of a Planted Tank > Fertilizers and Water Parameters


Reply
 
Thread Tools Display Modes
Old 04-20-2015, 05:55 PM   #1
JSV
Newbie
 
JSV's Avatar
 
PTrader: (0/0%)
Join Date: Apr 2015
Location: Costa Rica
Posts: 4
Question

Potassium nitrate for potassium deficiency.


Hi,

I have a doubt with potassium nitrate. Since I haven't found potassium sulphate, I bought some potassium nitrate. The composition is 45% K and 13% N, plus inert elements. I make 50% water changes every week in my 5 and 10 gallon tanks. I have DIY Co2 and 2.5 watts/gallon in both tanks.

Can I use it to provide potassium? How can I control the nitrates?

Thanks.
JSV is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 04-20-2015, 06:02 PM   #2
alcimedes
Algae Grower
 
PTrader: (1/100%)
Join Date: Dec 2014
Location: Colorado Springs
Posts: 97
Default

Have you looked at the dosing calculators online? Those are probably the best place to start.

http://calc.petalphile.com/
alcimedes is offline   Reply With Quote Quick reply to this message
Old 04-20-2015, 06:06 PM   #3
JSV
Newbie
 
JSV's Avatar
 
PTrader: (0/0%)
Join Date: Apr 2015
Location: Costa Rica
Posts: 4
Default

Yeah, I did. It says that my dose should be 1/16 tsp per 5 gallons. My doubt is how I can control the nitrates.
JSV is offline   Reply With Quote Quick reply to this message
Old 04-20-2015, 06:18 PM   #4
mattinmd
Wannabe Guru
 
PTrader: (2/100%)
Join Date: Aug 2014
Location: Maryland, USA
Posts: 1,477
Default

Are your nitrates a problem that need controlling?

Plants need nitrogen to after all.

If your nitrates are already a problem, KNO3 is probably not the best source of potassium to be using, and you should find some K2SO4.

I currently half-dose my KNO3 because I'm overstocked with fish (which produce plenty of nitrate to keep me above 20ppm), and dose K2SO4 to make up for it.
__________________
New to planted tanks, avid gardener/tinkerer.
36g bow tank journal Fluval C4 + Quietflow 30, Finnex Planted+ with dimmer mod, low-tech.
10 gallon secondary tank with Finnex stingray, AC20, low tech
mattinmd is online now   Reply With Quote Quick reply to this message
Old 04-20-2015, 06:18 PM   #5
imcmaster
Planted Tank Obsessed
 
imcmaster's Avatar
 
PTrader: (0/0%)
Join Date: Jan 2015
Location: Newmarket, Ontario, Canada
Posts: 374
Default

Do you have access to Seachem's Potassium product? You probably want dry ferts, but this can tie you over until you get K2SO4.

So you are getting enough Nitrates from the ammonia cycle? And your plants can't uptake the Nitrates in the tank? Do you have a test kit for Nitrates to know for sure your nitrates are running high?
imcmaster is online now   Reply With Quote Quick reply to this message
Old 04-20-2015, 06:53 PM   #6
JSV
Newbie
 
JSV's Avatar
 
PTrader: (0/0%)
Join Date: Apr 2015
Location: Costa Rica
Posts: 4
Default

The nitrates are not a problem right now, there's no algae yet. I'll use potassium nitrate temporary until I find some potassium sulphate.

I don't have a nitrate test but maybe the water changes would keep it controlled I guess... ?
JSV is offline   Reply With Quote Quick reply to this message
Old 04-20-2015, 07:15 PM   #7
Malakian
Planted Member
 
Malakian's Avatar
 
PTrader: (0/0%)
Join Date: Aug 2014
Location: Norway
Posts: 260
Default

Waterchanges will also take out the K. Most people on this forum use the EI method for dosing different chemicals to the water. The testing behind this method shows that nutrients (nitrate, phosphate etc) does not cause algae in itself. So for us that use EI, we have a lot of all the nutrients in the water. What causes algae is to much light or to little available co2 for your current setup. So the general notion goes, you got algae, use more Co2. If you can't do that (Because you don't have Co2, or already have a high ppm of Co2 in the water) use less lights.

So if you want to go the nutrient limiting approach to algae, you will have a hard time with plants ime.

If you just want to dose just K you can use Potassium sulphate as you mentioned, or you could also use Potassium Chloride (KCL) if thats easier to get where you are.
__________________
Malakian is offline   Reply With Quote Quick reply to this message
Old 04-20-2015, 07:18 PM   #8
mattinmd
Wannabe Guru
 
PTrader: (2/100%)
Join Date: Aug 2014
Location: Maryland, USA
Posts: 1,477
Default

Nitrates (and other fertilizers) don't generally cause algae in planted tanks... So the absence or presence of algae isn't really an indicator. If it did the EI folks would be in deep trouble.

Water changing is the basic premise that EI uses to control levels... You don't have to use EI to take advantage of that basic fact.

If you do a 50% water change weekly, it is impossible to have more than twice what you dose each week (counting all sources, including fish food which is significant for nitrates...).

Similarly a 25% weekly change caps you at 4x your weekly dose, and a 20% weekly change caps your levels at 5x your weekly dose.
__________________
New to planted tanks, avid gardener/tinkerer.
36g bow tank journal Fluval C4 + Quietflow 30, Finnex Planted+ with dimmer mod, low-tech.
10 gallon secondary tank with Finnex stingray, AC20, low tech
mattinmd is online now   Reply With Quote Quick reply to this message
Old 04-20-2015, 08:57 PM   #9
JSV
Newbie
 
JSV's Avatar
 
PTrader: (0/0%)
Join Date: Apr 2015
Location: Costa Rica
Posts: 4
Default

So 25% water changes would help to stabilize nitrates...
JSV is offline   Reply With Quote Quick reply to this message
Old 04-20-2015, 09:09 PM   #10
mattinmd
Wannabe Guru
 
PTrader: (2/100%)
Join Date: Aug 2014
Location: Maryland, USA
Posts: 1,477
Default

25% water changes will help limit the levels of everything that isn't in your change water.. including nitrate and potassium..
__________________
New to planted tanks, avid gardener/tinkerer.
36g bow tank journal Fluval C4 + Quietflow 30, Finnex Planted+ with dimmer mod, low-tech.
10 gallon secondary tank with Finnex stingray, AC20, low tech
mattinmd is online now   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 01:57 PM.


Powered by vBulletin®
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Copyright Planted Tank LLC 2012