Mr. Barr,
Just recently tuned to your station here and read something astonishing. I don't quite remember which page. It may have been in a discussion regarding your enzyme article, however I believe you offered that plant NH4 uptake is poor at non-toxic levels and that at these levels typical of a healthy tank with normal or high fish loads the NO3 uptake is much higher.
I'll have to admit to being a bit skeptical based on what I've read in the past, however, if your theory/data is valid then the implications would seem to challenge many popular beliefs. For example, that plants compete with the nitrifying bacteria for ammonia thus reducing their population. Another is that efficiency of wet/dry filters "steal" the NH4 which would otherwise be used by the plants, making them poor choices for planted tanks (among other reasons) or that cycling a new tank using many plants is somehow safer and quicker than cycling without plants since the plants would consume the NH4 and thereby reduce NO2/NO3 generation.
I know that there are may terrestial NPK fertilizers that derive much of their Nitrogen via Urea and NH4 and that these are applied using very diluted concentrations.
Could you therefore clarify the NH4/NO3 uptake mechanisms, or, if it requires another article to explain could you simply tell me if the implications I listed above hold water...so to speak?
Cheers,
Just recently tuned to your station here and read something astonishing. I don't quite remember which page. It may have been in a discussion regarding your enzyme article, however I believe you offered that plant NH4 uptake is poor at non-toxic levels and that at these levels typical of a healthy tank with normal or high fish loads the NO3 uptake is much higher.
I'll have to admit to being a bit skeptical based on what I've read in the past, however, if your theory/data is valid then the implications would seem to challenge many popular beliefs. For example, that plants compete with the nitrifying bacteria for ammonia thus reducing their population. Another is that efficiency of wet/dry filters "steal" the NH4 which would otherwise be used by the plants, making them poor choices for planted tanks (among other reasons) or that cycling a new tank using many plants is somehow safer and quicker than cycling without plants since the plants would consume the NH4 and thereby reduce NO2/NO3 generation.
I know that there are may terrestial NPK fertilizers that derive much of their Nitrogen via Urea and NH4 and that these are applied using very diluted concentrations.
Could you therefore clarify the NH4/NO3 uptake mechanisms, or, if it requires another article to explain could you simply tell me if the implications I listed above hold water...so to speak?
Cheers,