at the Farm
- Producers often rotate wheat, barley, rye and oats on same land - volunteer plants in subsequent years
- Several crops may be grown in close proximity on one farm
- Great variability from year to year due to
- weather, etc.
- Farms use the same harvesting, transport, and storage equipment without significant clean out
- Some corn and oats are purchased on a contract basis for greater control but mixture is not eliminated in these cases
