North Canterbury farmer Roger Johnson says it makes little sense for New Zealand to rely so heavily on imported nitrogen when a rich natural source already exists within farm systems. Supplied. Āmua, a Canterbury start-up based on a farm near Waiau in the Hurunui district is developing world-first wearable technology for cows that could change how farmers manage nitrogen on farm. For Āmua co-founder and chief executive Roger Johnson, a North Canterbury farmer, the idea grew f
