They are awaiting regulatory approvals and expect the merger will be completed late this summer.
When the deal was announced last September, it was estimated the combined company would have a share value of $36 billion US.
The head office for Nutrien will be in Saskatoon where PotashCorp is based.
The organization will also keep a corporate office at Agrium's home city of Calgary.
Potash Corp. is the world’s largest potash-mining company and Agrium is the largest fertilizer retailer.