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Nitrogen use efficiency (NUE) has been widely used in cropping systems to study nitrogen (N) cycles and inform N management on various spatial scales, from a single plant to the globe. Although the number of NUE studies is growing, interpretation of results is unfortunately hindered by widely differing definitions and quantification methods among studies, suggesting a pressing need for harmonization of approaches. Here, we proposed a conceptual framework to understanding the differences anddoi:10.21203/rs.3.rs-60369/v1 fatcat:ifwtwrinivczpdodwgiotvrlbq