I believe Robert T. Ricketts wrote this email section below:
Plants uptake and use nitrate (NO3) and ammonium (NH4), both forms are useful. Only nitrite (NO2) is excluded other than in sequestered intracellular reactions. Nitrite is too toxic to use as an uptake or internal transport form of usable nitrogen. The use of nitrate versus ammonium does involve a small additional energy expenditure, but that is trivial versus the obvious drawbacks to having high concentrations of ammonia/ammonium in the tank. That could be deadly on higher ph water.
So in theory by adding ammonia drops to my tank, the plants would only take up the ammonium part and leave the free ammonia behind?
-- Stuart Halliday http://mytriops.com/ 200 Million years in the making... _______________________________________________ Aquatic-Plants mailing list Aquatic-Plants at actwin_com http://mailman.actwin.com/mailman/listinfo/aquatic-plants