Hi.
What acid do you use?
If you use little or no nutrients, nitrogen based pH-down may effect your NO3-NH4 relationship. That will again effect your pH.
In your case i suspect to little NH4 in your solution compared to NO3.
Found this information on the topic.
Read this: https://www.cannagardening.com/how_ammonium_nitrate_ratio_affects_your_plants
Note: If you grow cold, pay attention to this:
"At lower temperatures, ammonium nutrition may be a more appropriate choice, because oxygen and sugars are more available at root level. Additionally, since the transport of nitrate to the leaves is restricted at low temperatures, fertilization based on nitrates will only delay the growth of the plant. The effect of the substrate temperature also depends on plant species."
And:
The effect of ammonium and nitrate uptake is especially important in soil-less media, where the roots can affect the pH of the medium more quickly because their volume is relatively large compared with the volume of the medium. To prevent the pH of the medium from changing too rapidly, an appropriate ammonium/nitrate ratio and substrate temperature are essential, according to the plants growth stage.
Hi!
Acid as in PH regulating acid? I use Biobizz PH down. I've tried finding if it's nitrogen based but the only thing I've found so far is that it contains lemon acid.
Thanks for the link, I've read through but can't say I actually understand all of it. What would my best course of action be at this stage?
I realise I'm asking a lot, hope you guys have the time to help a newb out.