Kernels that pass the screen but won't emerge in the field
Only density catches the right-sized but hollow kernel.
A screen measures size, not weight. A hollow, insect-damaged or weak-embryo kernel can be the same size as a sound one — it passes the screen, goes into the bag and never emerges in the field. The gravity table separates kernels by density on a vibrating deck riding an air cushion.
Gravity separation is the station that directly lifts germination: once the low-density fraction is removed, the viability of the remaining batch rises measurably.
The separated fraction is weighed and reported too; on request it is delivered separately to the feed industry. No fraction quietly disappears.
Measured at inlet
- Test weight / density profile — table tilt and airflow are set accordingly
- Sample viability check — calibration of the separation threshold
Delivered at outlet
- Density band — low-density fraction leaves the line
- Fraction record — separated quantity is weighed and reported
