 Four groups, including the American Farm Bureau, American Soybean Association, National Corn Growers Association, and National Farmers Union, sent a letter to Treasury Secretary Janet Yellen and Office of Management and Budget Director Shalonda Young, urging them to ensure the Clean Field Production Credit, 45Z, works for U.S. farmers. Now, the letter says, quote, without clear domestic feedstock requirements in the tax credit, the benefits of this policy are at risk of being diverted.