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Growers take extra care by flushing and cleaning their harvesting equipment when switching classes between fields (Bingen and Siyengo 2002). Buyers specify limits to mixed classes of beans based on quality although not injurious to health. Cross‐contamination with soybeans presents a significant allergen risk and is cause for load rejection at the elevator. Growers are diligent to maintain a barrier between fields and quite often use dedicated combines if they have both crops on their farm operation. Extra care is also taken to make adjustments within their respective harvests processes to minimize damage to the actual seed coat of the bean. The lower the percentage of cracked or checked seed coat the greater the quality because the bean maintains its integrity when canned. The higher the percentage of seed coats that have been fractured, the poorer the beans’ function when canned or cooked (J. Cramer 2020, personal communication).

Growers are paid for their beans on a cleaned, dry weight. Upon delivery at the elevator/processing facility, the load will be sampled and graded. Grading includes a visual inspection for safety, testing for moisture, screening for foreign material, and hand sorted to determine what percentage of the load is suitable for consumption. The elevator operator/processor also uses this grading process to determine where the load will be received (Bingen and Siyengo 2002). The lot is managed to assess need for additional mechanical drying, making beans suitable for long term storage.