General Info: Prairie Grain Partners is a partnership with Benson-Quinn Company and Tri-Line Farmers Cooperative that was formed in 1997. Prairie Grain Partners has agronomy facilities in Clarkfield, Burr and Dovray, Minn., and grain facilities in Clarkfield and Boyd, Minn. PGP is a team of more than 10 managers and agronomists that offer grain merchandising, freight trading, financing, accounting, tax services and more.