Nitrogen fixation

There is a certain class of fishes called bony fishes . As Ammonia passes through their gills , Ammonia gets converted to ammonium ions which then bony fishes will excrete as a waste product . As we know Ammonium ions are the substrate for the formation of nitrite (NO2^-) and nitrate (NO3^-), which is then taken up by plants thats when we call nitrogen has been fixed . But as we see Ammonium ions has been excreted by bony fishes , so Ammonium ions are there in water . Then we put the bacteria that oxidise ammonium ions into nitrites and then to nitrates . But as we know nitrates are soluble in water that means there will be no formation of precipitates . Nitrates will be there in water waiting for somebody to extract them and feed it them to plants so that by eating plants we can ultimately get that nitrogen . SO is there a way by which we can precipitate out nitrates which are originally soluble in water?

#Chemistry

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Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$