The 1 row onion harvester allows an average speed of about 3 km / h for a density of about 30 umbels per meter, but this is variable depending on the quality of the harvest: density, presence of bindweed, sloping onions and intersecting ...
In the extreme case it is necessary to reduce to 1.5 km / h.
In the best cases, it is possible to go beyond 5 km / h.
It is relatively common to exceed 1.5 ha / day.
With the single row, the spacing between rows is less important than with a 2 or 4 rows. The greater the spacing, the less likely you are to damage the neighboring row.