DuPont Co., the world’s second-largest seed maker, acquired two U.S. companies as part of an expansion in corn and soybeans. Terms of the deals weren’t disclosed.

DuPont’s Pioneer Hi-Bred seed unit acquired Seed Consultants Inc., based in Washington Court House, Ohio, and Terral Seed, based in Lake Providence, Louisiana, the company said today in an e-mailed statement. The acquired companies previously distributed seed through Des Moines, Iowa-based Pioneer’s ProAccess distribution system.

Pioneer this month completed acquisitions of other ProAccess partners, including Hoegemeyer Hybrids of Hooper, Nebraska; NuTech Seed of Ames, Iowa; and AgVenture Inc. of Kentland, Indiana, DuPont said.

Pioneer’s nine ProAccess partners account for 5 percent of the U.S. corn seed and soybean markets, Bridget Anderson, a spokeswoman for Wilmington, Delaware-based DuPont, said in a telephone interview. ProAccess partners include recently acquired companies and Curry Seed Co., which was acquired in 2008, she said.

Pioneer continues to distribute seed through independent ProAccess partners, including Beck’s Hybrids of Atlanta, Indiana; Burrus Hybrids of Arenzville, Illinois; and Doebler’s Pennsylvania Hybrids Inc. of Jersey Shore, Pennsylvania.