then we would expect Tropica to increase their K levels in their liquid fertilizer, on top of that they add more NH4 in their liquid fertilizer while using NH4 rich ADA soil. this is the question only ADA can answer, why they choose to add more K in the water? they too add more NH4/Urea in their liquid fertilizer, if their concern was NH4 being released from the substrate and need for more K, then they wouldn't be adding more NH4/Urea in their liquid fertilizer to begin with.
even the data from those rivers that most of these plant originated from shows both NH4 0.07-0.32 range and K around 0.2-2.2 range present in the water all time, this is rather similar to Tropica level, none of the data shows very high amount of K in those waters. #3 with possibly high in organic decomposing resulting in higher Co2 32.4, NH4 0.32, K at 1.54
View attachment 186869
Thanks for hammering this home @Happi ! - Remember I started a thread on this last year;
Hello, I thought this was interesting: Chemistry of different Amazonian water types. Now, the paper is not specifically about aquatic plants in the Amazonas, but I thought it was interesting how low the water column levels of essentially every mineral are in the rivers they sampled from. I...
I always like @JoshP12's posts. I am just a humble research engineer and apparently not smart enough to be able to immediately decrypt his condensed writing, but I love a good challenge and often I think I eventually get it. Takes a bit of effort.