While not aquatic, this study does show how the relations between CO2
increases(just 2x ambient in this case, for aquariums using 30ppm CO2
as a measure, this is 10X ambient, so likely more effect) and how and
why a higher concentration of NO3 is useful in conjunction with high
CO2.

Obviously NH4 would be nice as well, but the idea of 20-30ppm of NO3
is one thing, and the notion of 5-10ppm of NH4 is quite another(dead
fish due to ammonia toxicity even at lower pH ranges).

Lots of good stuff, although many are not going to get the names and
all the relationships. Figures are between ambient(white) and
elevated(black) CO2.

http://www.blackwell-synergy.com/lin....00466.x/full/

Be nice to do such a study on rice and then perhaps a weed like
Hydrilla or other aquatics. It's also not in submersed conditions
which also would be nice to see and add leaf uptake of NH4/NO3.




Regards,
Tom Barr

www.BarrReport.com