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Nitrogen use efficiency, 2014

Nitrogen use efficiency (NUE) is the ratio between nitrogen inputs and output. A NUE of 40% means that only 40% of nitrogen inputs are converted into nitrogen in the
form of crops.

0No data0%20%40%60%80%Nitrogen mining
World

Source: Lassaletta, Billen, Grizzetti, Anglade & Garnier (2014). 50 year trends in nitrogen use efficiency of world cropping systems: the relationship between yield and nitrogen input to cropland.
Environmental Research Letters.