Nutrien Ltd. says it will expand its use of a proximity alarm and contact tracing technology to help protect 14,500 of its employees from the COVID-19 pandemic.The Saskatoon-based company says it has rolled out its Proximity Trace equipment, made by U.S.-based Triax Technologies, to more than 8,000 employees to date and expects to introduce it to 6,500 more in coming months, representing 65 per cent of its global employee base.