What is the importance of Nitrogen derived from atmosphere(%Ndfa) in calculating BNF?

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Wajid Nasim Jatoi

Dear Md Tawhid Hossain,

Please find more information that might be fruitful for your answer from following links

http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/21/086/21086591.pdf

Article Biological nitrogen fixation, accumulation of soil nitrogen ...

http://www.nrcresearchpress.com/doi/abs/10.1139/cjps-2016-0185?journalCode=cjps#.Wi4Qz0qWbIU

Thanks !!

Susantha Jayasundara

It is the key parameter required for quantifying the amount of N biologically fixed by a plant or crop. It can be determined using a standard method that utilize the 15N isotope as a tracer (either by employing the '15N isotope dilution method' by using 15N enriched N compounds or by '15N natural abundance method'.

Detailed methodology for both options can be found in this book:

http://aciar.gov.au/files/node/10169/mn136_measuring_plant_associated_nitrogen_fixation_19979.pdf

D. V. Pathak

Importance of BNF is to quantify the amount of nitrogen fixed by BNF as compared to by other means. Our environment cotains about 78%nitrogen by volume and we must quantify N2 fixed through BNF.