Adjusting K for Hygrophila - The Planted Tank Forum
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post #1 of 7 (permalink) Old 05-18-2017, 03:23 PM Thread Starter
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Adjusting K for Hygrophila

Even though some of these are supposed to be easy, I am a hygro killer. Most other plants do fine. I'm thinking I should up the K but adding liquid Seachem Potassium is expensive.

Here is my macro formula:
6 parts KNO3 [N+K]
3 parts KH2PO4 [P+K]
3 Parts K2SO4 [K]
1 part Ca(NO3)2 [Ca+N]
1 part MgSO4 [Mg]

Should I add more K2SO4 or what would you suggest?

Larry Grenier, Husband, Father, Grandfather
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post #2 of 7 (permalink) Old 05-18-2017, 03:29 PM
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Quote:
Originally Posted by larrygrenier View Post
Even though some of these are supposed to be easy, I am a hygro killer. Most other plants do fine. I'm thinking I should up the K but adding liquid Seachem Potassium is expensive.

Here is my macro formula:
6 parts KNO3 [N+K]
3 parts KH2PO4 [P+K]
3 Parts K2SO4 [K]
1 part Ca(NO3)2 [Ca+N]
1 part MgSO4 [Mg]

Should I add more K2SO4 or what would you suggest?
You already have potassium sulfate just up the amount..

I'd be really sure that it's a K deficiency before throwing more chemicals in the water.
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post #3 of 7 (permalink) Old 05-18-2017, 04:01 PM Thread Starter
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Thanks GrampsGrunge

I suspect K defficiency only because of the health of all the other plants. This is 2 96 gallon tanks plummed together and Hygros do extremely poorly in both while other plants are doing fine and require regular trimming.

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post #4 of 7 (permalink) Old 05-18-2017, 06:35 PM
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Pics of the Hygro and other plants would help, and a full tank shot

And more info about your substrate, light, and CO2?

Also could you list the actual ppms youre dosing? Listing the parts of everything (or mls or tsps) doesnt really say much.

Are you dosing any micro nutrients or Fe?

Here is a nutrient calculator that'll figure the ppms for you. https://rotalabutterfly.com/nutrient-calculator.php

"Premixed" will give you brand name products like Flourish liquids, DIY is for dry salts like KNO3 etc.

Hygros have a reputation for being K hogs. This is primarily because most varieties are quick to display the classic pinhole symptoms in lower leaves.

This can sometimes be a straight K deficiency, but can also be an "induced" deficiency brought on by some other nutrient imbalance.

Its sounds like you probably have enough K, but again its hard to say without knowing the specific ppms.

Do you know the total GH of your tap water, or whatever kind of water you're using? Specifically how much Ca and Mg is in thereto begin with? That'll help knowing if you might be low on either one of those.
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post #5 of 7 (permalink) Old 05-19-2017, 03:16 AM
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My hygros are the same. I have quite a few varieties in the same tank and they love their K. If I don't dose it in addition to my EI dosing, I watch them slowly whither away. Oddly enough, my Hygrophila Angustifolia seems to be the first one of the varieties to show deficiencies.
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post #6 of 7 (permalink) Old 05-19-2017, 04:27 AM
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You can get potassium chloride at ACE in the water softener area if you are worried about getting sulfate too high. I'm a bit shocked you can be short on potassium when dosing all those potassium salts for your other macro ingredients. Seems like it would be a huge excess, which matches Edwards charts in the article on NPK relationships (http://sites.google.com/site/aquaticplantfertilizer).


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post #7 of 7 (permalink) Old 05-19-2017, 03:24 PM Thread Starter
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Thanks everyone. After using the Nutrient Calculator" I've adjusted my EI to be more K-heavy. I'm almost out of liquid Seachem Potassium and after dosing a little of this things seem to be slightly improving. I use GLA's dry ferts so adding more K2SO4 [Potassium sulfate] is no big deal. Yes, I also dose CSM+B on alternate days. I will be getting new lights soon so I'm hoping for benefits from that as-well.

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