Thank you, Andrew. I think that it is the range which a Disa expert, Walter Orchard, recommend in his article, too. I think he uses hydroponic set-up, and your plants are similarly exposed to TDS of 100-150ppm all the time through the water tray. I'm going to try something similar.
According to one scientific study, Disa uniflora relatives seem to prefer some NH4 (over pure NO3) as the nitrogen source. This study also suggested continuous TDS around 125-200ppm was better than a higher concentration fertilization (the study didn't have any lower fertilization scheme). So your success with Disa backs up their studies! Very cool, thank you for sharing your experience! Philip and I talked about this study in
another thread here.
Hybrid Mode
