Table 2 Descriptive statistics of walnut morphological traits
From: 3D characterization of walnut morphological traits using X-ray computed tomography
| Morphological trait | Unit | Mean ± SDa | Range |
|---|---|---|---|
| Nut | |||
| Nut length | mm | 38.39 ± 2.18 | 28.57–51.43 |
| Nut face diameter | mm | 32.27 ± 1.70 | 25.99–40.75 |
| Nut profile diameter | mm | 33.29 ± 1.70 | 27.06–42.84 |
| Nut volume | mm3 | 19,400.02 ± 2669.03 | 10,382.05–42,813.08 |
| Nut shape VA3D | – | 1.47 ± 0.08 | 1.24–1.69 |
| Nut feret shape 3D | – | 1.25 ± 0.05 | 1.12–1.48 |
| Nut surface area | mm2 | 4019.53 ± 401.91 | 2622.59–7093.53 |
| Nut sphericity | – | 0.88 ± 0.02 | 0.84–0.93 |
| Shell | |||
| Shell volume | mm3 | 4076.78 ± 595.05 | 2390.66–9051.88 |
| Shell thickness | mm | 1.03 ± 0.12 | 0.73–1.49 |
| Shell rugosity | – | 1.14 ± 0.02 | 1.07–1.19 |
| Kernel | |||
| Kernel volume | mm3 | 5723.89 ± 1039.03 | 3408.85–9548.93 |
| Kernel filling ratio | % | 30.02 ± 3.55 | 20.66–37.42 |
| Empty space | |||
| Empty space volume | mm3 | 9599.35 ± 1719.56 | 4536.51–24,212.21 |