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(A) Nitrogen fertilizer use efficiency, (B) N uptake efficiency, and (C) N yield use efficiency measured on three blocks for 10 different hybrids, which were released in the period between 1971 and 2012 and either grown in 2015 or 2016. S = slope of the regression. The regression indicates differences among hybrids across the year of registration. All slopes were tested to be significantly different from zero. Significance levels are: ***p < 0.001.
