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Allometric relationships within nodes 3 and 4 under compacted (red circles) and non-compacted (blue squares) conditions. Full lines indicate that allometry is present. No significant allometric relationship is found under node 4, while node 3 root cross-sectional area scales allometrically across field sites for compacted roots. The allometric scaling component (α) depicts allometry when the relationship is significant (*P≤0.05, ***P≤0.001), ns stands for non-significant.
