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 |