Quantifying crop nitrogen status for comparisons of agronomic practices and genotypes

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Interactions between water and nitrogen in Australian cropping systems: physiological, agronomic, economic, breeding and modelling perspectives (2016, background): “However, the lack of allometric relationships of nitrogen concentration and biomass under water deficit to derive a reliable nitrogen-nutrition index (Sadras and Lemaire 2014) means that we have little or no reliable information on the nitrogen status of water-stressed crops.”
Breeding for increased nitrogen‐use efficiency: a review for wheat (T. aestivum L.) (2016, background): “…reasons for this are very different between nitrogen and water, framing the nitrogen community in much the same way as the water community could help in placing the focus on NU and on systematically accounting for the total biomass when evaluating NU, as advocated by Sadras and Lemaire (2014).”