Striking workers of the potash producer Belaruskali take part in a rally to protest against presidential election results, in Salihorsk (Soligorsk), Belarus August 19, 2020. REUTERS/Vasily Fedosenko

Striking workers of the potash producer Belaruskali take part in a rally to protest against presidential election results, in Salihorsk (Soligorsk), Belarus August 19, 2020. The placard reads: "Miner, we stand to the end. Time is on our side!" REUTERS/Vasily Fedosenko

A participant holds a placard as striking workers of the potash producer Belaruskali take part in a rally to protest against presidential election results, in Salihorsk (Soligorsk), Belarus August 19, 2020. REUTERS/Vasily Fedosenko

Striking workers of the potash producer Belaruskali take part in a rally to protest against presidential election results, in Salihorsk (Soligorsk), Belarus August 19, 2020. REUTERS/Vasily Fedosenko

A man puts his name on the list of participants of a strike action of the potash producer Belaruskali's workers during a protest against presidential election results in Salihorsk (Soligorsk), Belarus August 17, 2020. REUTERS/Vasily Fedosenko

People, including workers of the potash producer Belaruskali, put their names on the list of participants of a strike action during a protest against presidential election results in Salihorsk (Soligorsk), Belarus August 17, 2020. REUTERS/Vasily Fedosenko

People, including workers of the potash producer Belaruskali, put their names on the list of participants of a strike action during a protest against presidential election results in Salihorsk (Soligorsk), Belarus August 17, 2020. REUTERS/Vasily Fedosenko

People, including workers of the potash producer Belaruskali, put their names on the list of participants of a strike action during a protest against presidential election results in Salihorsk (Soligorsk), Belarus August 17, 2020. REUTERS/Vasily Fedosenko

Workers of the potash producer Belaruskali attend a meeting to prepare for a strike action and a protest against presidential election results near Salihorsk (Soligorsk), Belarus August 17, 2020. REUTERS/Vasily Fedosenko

Workers of the potash producer Belaruskali put their names on the list during a meeting to prepare for a strike action and a protest against presidential election results near Salihorsk (Soligorsk), Belarus August 17, 2020. REUTERS/Vasily Fedosenko

Workers of the potash producer Belaruskali attend a meeting to prepare for a strike action and a protest against presidential election results near Salihorsk (Soligorsk), Belarus August 17, 2020. REUTERS/Vasily Fedosenko

Workers of the potash producer Belaruskali attend a meeting to prepare for a strike action and a protest against presidential election results near Salihorsk (Soligorsk), Belarus August 17, 2020. REUTERS/Vasily Fedosenko

Workers of the potash producer Belaruskali attend a meeting to prepare for a strike action and a protest against presidential election results near Salihorsk (Soligorsk), Belarus August 17, 2020. REUTERS/Vasily Fedosenko

A general view of the Teutschenthal mine near Halle, Germany, November 8, 2019. Around three dozen mine staff in eastern Germany were rescued on Friday after being trapped 700 metres (2,300 feet)below ground following an unexplained blast in a potash mine, police said. Reuters/Marvin Gaul

A general view of the Teutschenthal mine near Halle, Germany, November 8, 2019. Around three dozen mine staff in eastern Germany were rescued on Friday after being trapped 700 metres (2,300 feet)below ground following an unexplained blast in a potash mine, police said. Reuters/Marvin Gaul

A general view of the Teutschenthal mine near Halle, Germany, November 8, 2019. Around three dozen mine staff in eastern Germany were rescued on Friday after being trapped 700 metres (2,300 feet)below ground following an unexplained blast in a potash mine, police said. Reuters/Marvin Gaul

Nutrien's Cory potash mine is seen from a distance near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

A Nutrien employee staffs the control room at the Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

The elevator that transport everything in and out of Nutrien's Cory potash mine is seen near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

A Nutrien employee checks over an electric vehicle (EV) at the Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

A tote board indicates where each employee is at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

An entry to the tunnels is seen at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

A power substation is seen at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

A line of electric vehicles (EV) used at Nutrien's Cory potash mine are seen near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

An entry to the tunnels is seen at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

An electric vehicle (EV) charging station is seen at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

Excavation is done in a new tunnel at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

Employees set anchor bolts to secure the tunnel ceiling at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

Employees set anchor bolts to secure the tunnel ceiling at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

A view of excavation works is seen in a new tunnel at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

The cutting head on the boring machine is seen at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

Marks of the cutting head are seen on the potash face at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

A rest area is seen at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

A sign indicating a designated refuge room is seen at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

Marks of the cutting head are seen on the potash face at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

A machine shop is seen at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

Rail cars being loaded are seen at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

An employee in a control room prepares to start loading rail cars at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

Rail cars waiting to be loaded are seen at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

A refuge room is seen at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

Rail cars being loaded at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

Enclosed conveyers that transport potash to the warehouses are seen at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

A general view of Nutrien's Cory potash mine is seen near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

Enclosed conveyers that transport potash to the warehouses are seen at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

An interior view of the storage warehouse is seen at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

An interior view of the storage warehouse is seen at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

Nutrien employees stand in the storage warehouse at its Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

An interior view of the storage warehouse is seen at Nutrien's Cory potash mine near Saskatoon, Saskatchewan, Canada August 12, 2019. REUTERS/Nayan Sthankiya

Participants are seen at the stand of the Russian potash fertilizer producer Uralkali, made of roses, during the St. Petersburg International Economic Forum (SPIEF), Russia, June 6, 2019. REUTERS/Maxim Shemetov

An aerial view shows the brine pools of SQM lithium mine on the Atacama salt flat in the Atacama desert of northern Chile, January 10, 2013. Picture taken January 10, 2013. REUTERS/Ivan Alvarado

An aerial view shows the brine pools of SQM lithium mine on the Atacama salt flat in the Atacama desert of northern Chile, January 10, 2013. Picture taken January 10, 2013. REUTERS/Ivan Alvarado

An aerial view shows the brine pools of SQM lithium mine on the Atacama salt flat in the Atacama desert of northern Chile, January 10, 2013. Picture taken January 10, 2013. REUTERS/Ivan Alvarado

A farmer spreads fertizer mixed with potash in his paddy field on the outskirts of Ahmedabad, India, July 13. 2017. Picture taken July 13. 2017. REUTERS/Amit Dave

The logo of Russian potash producer Uralkali is seen on a board at the St. Petersburg International Economic Forum 2017 (SPIEF 2017) in St. Petersburg, Russia, June 1, 2017. Picture taken June 1, 2017. REUTERS/Sergei Karpukhin

People attend the opening ceremony of the new Belarussian-built potash plant in Garlyk, Turkmenistan March 31, 2017. REUTERS/Marat Gurt

People attend the opening ceremony of the new Belarussian-built potash plant in Garlyk, Turkmenistan March 31, 2017. REUTERS/Marat Gurt

Agrium Inc and Potash Corp of Saskatchewan are in talks to merge, a deal that would create a fertilizer and farm retailing giant, but also trigger regulatory scrutiny.

Chris McKay, PotashCorp load-out supervisor at the Cory Mine, examines potash inside one of the storage facilities near Saskatoon, Saskatchewan October 10, 2013. REUTERS/David Stobbe/File photo

The logo of Russian potash producer Uralkali is pictured at the company's stand during the St. Petersburg International Economic Forum 2016 (SPIEF 2016) in St. Petersburg, Russia, June 16, 2016. REUTERS/Sergei Karpukhin

Mike James, an employee of Mosaic Co, holds phosphate pebbles as it comes off the grading screens at Mosaic's South Fort Meade Mine in Fort Meade, Florida January 13, 2010. REUTERS/Scott Audette/File Photo