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Maintain Quality When Drying Small Grain
NDSU research has shown the air temperatures at which milling and baking damage become apparent for hard red spring wheat are 160 degrees, Fahrenheit, for 16 percent moisture content; 140 degrees for 20 percent initial moisture content; and 120 degrees for 24 percent moisture. These values are for airflow rates of 100 to 150 cubic feet per minute per square foot.
To keep kernel temperatures below 120 degrees, Fahrenheit, reduce drying air temperature 10 degrees for an airflow of 50 cubic feet per minute per square foot.
In all cases grain nearest the heat source is most severely damaged.
Durum is very sensitive to dryer temperatures. With higher drying temperatures, the percentage of specks in the processed semolina increases.
For barley, NDSU research has shown the maximum allowable drying air temperature is 130 degrees, Fahrenheit, and the maximum harvest moisture content, 20 percent.
Since the burner of a dryer cycles on and off, it's safer to use a temperature lower than 130 degrees.
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