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Grain yield of five super hybrid rice cultivars under different N treatments in 2015 and 2016 (A), and average grain yields with grain yield production increase from using N (ΔG) (B). 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).
