Prospects and problems of simple linear models for estimating symbiotic N2 fixation by crop and pasture legumes

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Break-crop benefits to wheat in Western Australia – insights from over three decades of research (2012, background): “Given that only 30% of lupin’s aboveground biomass is generally harvested in grain (i.e. harvest index = 0.30; Unkovich et al. 2010a) much of the N2 fixed by lupin will be returned to the soil in crop residues for subsequent mineralisation by soil microbes (Fillery 2001).”
Global assessment of limitation to symbiotic nitrogen fixation by phosphorus availability in terrestrial ecosystems using a meta‐analysis approach (2013, result): “This hypothesis is supported by large-scale studies which already showed that SNF flux was strongly and linearly influenced by plant biomass [Herridge et al., 2008; Unkovich et al., 2010].”
Factors affecting the potential contributions of N2 fixation by legumes in Australian pasture systems (2012, methodology): “The total amounts ofN2fixed achieved in each casewere calculated by adjusting the shoot-based N2 fixation data using the appropriate species ‘root factor’ from Table 5 (Unkovich et al. 2010).”