New technology helps farmers to remove nitrates from water Associate Professor in Environmental Hydrology and Soil Science Ranvir Singh explains to Prime Minister Jacinda Ardern the results of their research. Massey University scientists unveiled a prototype of their novel systems for stripping nitrate from farm drainage at this year’s Fieldays, capturing hundreds of people's attention including farmers of all ages, members of the public and Prime Minister Jacinda Ardern. Associate Professor in Environmental Hydrology and Soil Science Dr Ranvir Singh and Associate Professor in Soil Science Dr David Horne have been working on this project since 2018 and were excited to share the next step with the public.