Since the 1920s, crop scientists have focused on breeding improved strains to provide ever bigger yields, and in the past decade, the emphasis has been on developing crops that can also withstand extreme weather events.

Wal-Mart Stores Inc. has long used its commercial might to forge a global supply chain with ruthless efficiency. It now has a new target: U.S. wheat fields.

Monsanto Co. announced it reached an agreement to purchase planting technology developer Precision Planting Inc.

Precision Planting will become part of Monsanto’s Integrated Farming Systems unit, which utilizes advanced agronomic practices, seed genetics and innovative onfarm technology to deliver optimal yield to farmers while using fewer resources.