Physically clean out the combine hopper and auger before you begin. Adjust the combine carefully according to the operator s manual to allow for Natto's small seed size and to keep seed damage to an absolute minimum. Keep the combine platform off the ground to avoid picking up soil, which can contaminate food-grade soybeans. It is important to level off the beans in the bin to provide uniform grain temperature control. Start the fan when you begin to fill the bin and run it for six weeks from time of filling in the fall until grain mass is at 35-40 F. Cooling is critical to eliminate moisture migration, insect and mold growth.
Aeration reduces moisture content and keeps soybeans in excellent condition.
Monitor temperature through the winter and aerate in early spring to equalize storage temperatures. Soybean Handling and Cleaning. Check all augers for sharp edges. Clean bins thoroughly before filling. Vacuum grain dust and remove leftover moldy grain.