NO3 and NH4 toxicity

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http://afs.allenpress.com/perlserv/?request=get-abstract&doi=10.1577%2F1548-8659(1986)115%3C196%3ACTOATF%3E2.0.CO%3B2

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12602850&dopt=Citation

http://md1.csa.com/partners/viewrecord.php?requester=gs&collection=ENV&recid=7413486&q=Fish+toxicity+nitrate+&uid=789865754&setcookie=yes

Seems that very high levels of NO3 from KNO3 would be required to harm
fish but very very small amounts of NH4.

So is providing more fish a better way to add N vs KNO3?

Regards,
Tom Barr

[Altum[_2_]]

wrote:
> http://afs.allenpress.com/perlserv/?request=get-abstract&doi=10.1577%2F1548-8659(1986)115%3C196%3ACTOATF%3E2.0.CO%3B2
>
> http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12602850&dopt=Citation
>
> http://md1.csa.com/partners/viewrecord.php?requester=gs&collection=ENV&recid=7413486&q=Fish+toxicity+nitrate+&uid=789865754&setcookie=yes
>
> Seems that very high levels of NO3 from KNO3 would be required to harm
> fish but very very small amounts of NH4.
>
> So is providing more fish a better way to add N vs KNO3?

I think the limited oxygen exchange capacity and high oxygen demand of
planted tanks at night is an even better argument for using KNO3 for
nitrogen-hungry plants rather than overstocking.

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