curious, tom. do you have a theory on why other folks have to lower their nutrient levels to grow UG?
Likely a CO2 issue.
As is the case with all folks who seem to believe excess nutrients/ferts = algae and poor growth in plants.
I've dispelled and proven this myth for close to 2 decades now, but it still persist strongly.
If that was the case, why doesn't my tank/tanks over the last 20 years with the high nutrients, lack algae issues and I grow these hard to grow plants with such ease?
Liebig's law is used in agriculture and should be applied here.
And it's also true that if CO2 is limiting, then you make say PO4 more limiting than CO2, this takes the stress off of CO2 supply/demand, which tends to be more critical.
The problem is not excess ferts. The problem is poor CO2 management and use.
In submersed culture, CO2 and light must also be included in Liebig Law of the minimum.
Many CP folks also have their own culture of of myths regarding bladderworts and aquatics, then tend to do poorly with them in horticulture.
UG curiously...........grows very well in emergent hydroponic culture. Same with another CO2 issue weed: HC and a dozen of others, because in emergent culture, there's no CO2 limitation.
We can crank the nutrients well above the typical ppm in aquariums and see they grow quite well.
Go figure.
