Count loose kernels on the ground after the combine to estimate yield loss in kg/ha before it adds up across the field.
A 1 m × 1 m square is easiest. Use 0.5–1 m² to keep the numbers intuitive.
Leave blank to use the standard average (45g for wheat). Enter your seed certificate figure if you have it.
Enter your expected yield to see loss as a percentage.
Mark out a known area (1 m² is easiest), count every loose kernel inside, and repeat in 3–4 spots across the field for an average. Check both the cut and uncut area if you want to separate header loss from threshing loss.
Simple arithmetic — no external data dependency. Treat as an estimate.