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High ammonium ok for plants?

> From: "Ashcraft, Bob" <BAshcraft at medrad_com>
> Subject: Re: what you read
> Can the assumption then be made that high ammonia levels in a fishless plant
> tank are preferable?

My understanding is that very high concentrations of ammonia are also
harmful to plants however you should not be dosing much above 1-5 ppm
which you could consider a low concentration for plants (not fish). In
swamps where ammonia occurs in higher concentration, the plants protect
their roots by oxygen provided in hollow channels in the stems and roots
called aerenchyma.

Note: a dose of 1ppm or more ammonia could be fatal to fish.