Two rows, one variety, one season — and a measurable gap in what comes off the combine. The reasons are rarely mysterious once you know where to look.
Soil rarely varies less than the crop above it. Organic matter, compaction and drainage shift metre to metre, and roots feel every change long before the canopy shows it.
A ridge that dries an hour sooner, a hollow that holds a late frost — microclimate decides how a variety expresses its potential. Genetics set the ceiling; the field sets the floor.
More on the ground itself in soil & water.