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Grain yield (A), grain filling (B), and spikelets per panicle (C) of five super hybrid rice cultivars grown under different N treatments in Jingzhou, Hubei Province, China, in 2015 and 2016. Data are the means of three replicates and the vertical bars represent the standard error. Different lowercase letters indicate significant differences (P < 0.05). The four N treatments were 0 kg ha-1 (N1), 210 kg ha-1 (N2), 300 kg ha-1 (N3), and 390 kg ha-1 (N4).
