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Re:Available Nitrogen in the water column

><< But isn't it possible to limit N in the _water column_, while still not
> allowing N to be limited in the substrate? >>
>Nitrogen is the single most common element in the atmosphere.  It will be
>almost four times more common in the water column than oxygen, because of the
>forces that cause exchange of gases at the surface.

The type of nitrogen referred to in Karen's statement about limiting
nitrogen is available  nitrogen, such as NO2, NO2, NH3, urea, etc.
Dissolved atmospheric nitrogen, N2, is not available to plants as a
nutrient.  If it were, there would never be any cases of nitrogen

Paul Krombholz, in foggy, chilly Jackson, Mississippi