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. 2019 Nov 5;6:115. doi: 10.3389/fmolb.2019.00115

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Copyright © 2019 Gupta, Zhang, Penton, Yu and Tiedje.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Nitrogen fixation potential for the leaf (L) and root (R) samples of different perennial grasses estimated using a laboratory ¹⁵N-incubation assay. Based on minimum ^δ15N (%_o) value for detection of N₂ fixation, the minimum detectable N fixation rate was 0.10 mg N fixed kg⁻¹ day⁻¹.