[...]There's enough nitrogen dissolving from the atmosphere as well as from organic matter in runoff to contribute to heavy filamentous algae blooms in waters I manage. When I see a 'good' plankton bloom, it is the result of adding soluble phosphorus to a pond at the right time at the right temperature.
I hesitate jumping in on this thread, because I'm pretty ignorant regarding water plants--this being my first pond. I'm familiar with legumes and other land plants that fix nitrogen in conjunction with various bacteria. And I think Azolla is a common water plant that can fix nitrogen in conjunction with cyanobacterium. Are there other plants or bacteria present in typical ponds that contribute significant nitrogen in the presence of the oxygen levels typical in ponds?
