How much is N concentrations in the fern?

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Arvind Singh

In which species of fern? N concentration varies in ferns. For example the N concentration is greater in nitrogen fixing species of fern Azolla than other non-nitrogen fixing fern species.

Châu Trần

I'm sorry. species of fern, I want to know, Pteris vittata L.

Jonas Nyman

What N do you mean? nitrate-N, amino-N, N bound in proteins? Inorganic N? Total Kjeldahl nitrogen?

Can't you use the Kjedahl method or the simple Lowry assay?https://en.wikipedia.org/wiki/Kjeldahl_method

https://en.wikipedia.org/wiki/Lowry_protein_assay