Senator Schatz's website has a page dedicated to farmers and ag businesses and the CARES Act. Those that qualify can either apply for assistance through the USDA or the SBA PPP loan program (click here to determine eligibility, as you can’t apply for both).
Here is the letter from HCA President, Christopher A. Manfredi, addressed to Mr. Dave K. Chun addressing the silos between SBA and USDA.