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Effect of NRE treatment on root length distribution across rooting depths under high-N (A) and low-N (B) conditions, and root length of different root classes at 120–150 cm (C, D) in the greenhouse mesocosms. Each column represents the mean of n=4 for each treatment. Error bars represent SEs, and columns with the same letter under the same depth or root class were not significantly different at P≤0.05 according to Tukey’s test.
