Jacobs Engineering Group Inc. has won the engineering and procurement contract for Monsanto Co.’s proposed $1 billion expansion of its Luling plant.

Pasadena-based Jacobs is one of the world’s largest and most diverse engineering and construction services companies. Group Vice President Manuel Junco said the company brings vast experience with chemical projects and strong presence in the U.S. Gulf Coast, including a Baton Rouge office, to the project.

St. Louis-based Monsanto announced plans for the proposed expansion in early July. The project is so large Monsanto said it will take three to five years to complete. Monsanto will make a final spending decision in early 2016. The expansion would allow the Luling plant to produce more dicamba, an herbicide used in protecting crops. Monsanto is targeting dicamba-based Roundup Ready Xtend Crop System products for initial use in soybean and cotton crops.