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Impact of different nitrogen (N) application rates on leaf area index at different growth stages in winter wheat during 2018 and 2019. Above bars, different small letters show significant differences among N treatments at each growth stage. N0: unfertilized control; N75: N application at 75 kg N⋅ha– 1; N150: N application at 150 kg N⋅ha– 1; N225: N application at 225 kg N⋅ha– 1; N300: traditional N application rate of 300 kg N⋅ha– 1.
