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Old 07-21-2020, 05:25 AM   #1 (permalink)
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Question KH and plants

Hi friends.

I have a question about KH and plants.
A higher KH is better for plants growing?

My tank has PH 7.2, hardness (GH) about 200ppm (11) and only 1dh of KH.

Should I try to increase it?
I don't use co2 injection or fertilizations.

I've read at Walstad book and understand that a high GH is better for most plants, but I didn't understand well about kh levels. But in this case that is so low, should I concern about?

Thanks
Alex
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Old 07-21-2020, 06:18 AM   #2 (permalink)
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Default Re: KH and plants

Higher kH is better for pH stability. Some plants can use Carbonates in place of CO2 so it can be a carbon source.

If you plants are doing fine, I wouldn't bother messing with the kH.
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Old 07-21-2020, 07:12 AM   #3 (permalink)
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Thumbs up Re: KH and plants

Quote:
Originally Posted by mistergreen View Post
Higher kH is better for pH stability. Some plants can use Carbonates in place of CO2 so it can be a carbon source.

If you plants are doing fine, I wouldn't bother messing with the kH.
Hi Mistergreen.

The plants are ok, but I think it could be better. Even Hygrophilas Polyspermas are growing slow. The water was too soft (50ppm or less), so I recently increased the GH (about one week ago).
Let's see what happens.

thanks!
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Old 07-26-2020, 02:25 AM   #4 (permalink)
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Default Re: KH and plants

Quote:
Originally Posted by alexsander.albani View Post
Hi friends.

I have a question about KH and plants.
A higher KH is better for plants growing?

My tank has PH 7.2, hardness (GH) about 200ppm (11) and only 1dh of KH.

Should I try to increase it?
I don't use co2 injection or fertilizations.

I've read at Walstad book and understand that a high GH is better for most plants, but I didn't understand well about kh levels. But in this case that is so low, should I concern about?

Thanks
Alex
KH is for pH and GH is for water hardness.As you have said your water is soft so you can increase GH
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Old 07-26-2020, 06:12 AM   #5 (permalink)
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Default Re: KH and plants

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Originally Posted by orangeversion View Post
KH is for pH and GH is for water hardness.As you have said your water is soft so you can increase GH
I haven't seen anything that makes me believe that pH is a parameter of importance to plants. Obviously the pH should not be below about 5.0 or above 8.0, but if it is between about 5.5 and 7.6 the plants are not likely to be affected. If you consider fish, the pH may be more important, especially for breeding the fish.

KH does affect the pH, but only if there is dissolved CO2 in the water. That is because the carbonic acid that is formed when CO2 is dissolved and bicarbonate ions form a buffer against changes in pH caused by weak acids and bases, but not CO2.
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Old 07-26-2020, 06:52 AM   #6 (permalink)
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Default Re: KH and plants

pH does affect the availability of micros to plants. Too high, like 8.0 is not good.
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