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Boxplots of the mean amounts of four nitrogen-use efficiency (NUE)-related agronomic traits of different accessions under the normal nitrogen (NN) level and the low nitrogen (LN) level. Phenotypic traits of (A) soil and plant analyzer development value (SV), (B) leaf length (LL), (C) plant height (PH), and (D) tiller number (TN) (****P < 0.0001; *P < 0.05).
