Quote:
Originally Posted by danielt
Can you elaborate a bit on that? What does organic nitrogen mean? AFAIK, the organic form is not accessible to plants as it is a too complex compound, just like organic carbon. It needs to be broken down to more simpler, inorganic, forms like NH3/NH4 before the plant can use that. The fertilizer nitrogen is indeed inorganic. Although plants prefer NH3 and NH4 before NO3.
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Organic nitrogen is referring to nitrogen derived from organic sources such as fish waste, uneaten food, decomposing plant matter, etc. High levels of organic nitrogen are usually a sign of poor water quality due to lack of maintenance, etc.