| AC | Alternating current |
| ARD | Average root diameter |
| CR | Root electrical capacitance |
| CR* | Apparent (saturation) root electrical capacitance |
| DAP | Days after planting |
| GY | Grain yield |
| MR | Minirhizotron |
| RL | Root length |
| RSA | Root surface area |
| RSS | Root system size |
| SDM | Shoot dry mass |
| SWC | Soil water content |
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