Table 1 Walnut morphological traits measured by the workflow
From: 3D characterization of walnut morphological traits using X-ray computed tomography
| Morphological trait | Symbol | Description | Unit |
|---|---|---|---|
| Nut | |||
| Nut length | L | The largest length of the nut from the base to the end | mm |
| Nut face diameter | F | The largest longitudinal section of the nut through suture | mm |
| Nut profile diameter | P | The largest longitudinal section of the nut perpendicular to suture | mm |
| Nut volume | Vn | Total volume of the nut, Vn = Vs + Vk + Ve | mm3 |
| Nut shape VA3D | S1 | Shape factor of the nut | – |
| Nut feret shape 3D | S2 | Feret shape factor of the nut | – |
| Nut surface area | A | Surface area of the nut | mm2 |
| Nut sphericity | Ψ | Index of nut roundness | – |
| Shell | |||
| Shell volume | Vs | Volume of the shell | mm3 |
| Shell thickness | T | Thickness of the shell | mm |
| Shell rugosity | Ω | Index of shell surface roughness | – |
| Kernel | |||
| Kernel volume | Vk | Volume of the kernel | mm3 |
| Kernel filling ratio | R | Ratio of the kernel volume Vk to the total volume of the nut Vn | % |
| Empty Space | |||
| Empty space volume | Ve | Volume of the empty space | mm3 |