What crop is primarily associated with ethanol production?

Corn is primarily associated with ethanol production due to its high starch content, which can be fermented into alcohol. The fermentation process is integral to producing ethanol, which is then used as a renewable fuel source. In the United States, corn is the leading crop for biofuel production, particularly ethanol, because it is abundant, affordable, and has well-established agricultural practices.

Wheat, while it can be used for ethanol production, is less common compared to corn. Barley and rice are also used in ethanol production but not at the same scale as corn. Therefore, corn's prominence in the agricultural landscape, along with government policies that support its use for biofuels, solidifies its position as the primary crop for ethanol production.