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Contrasting subsurface denitrification characteristics under temperate pasture lands and its implications for nutrient management in agricultural catchments

journal contribution
posted on 2024-06-21, 03:51 authored by Ranvir Singh, David Horne, Jonathan Roygard, Abby Matthews, Michael Hedley
Subsurface denitrification plays a key role in the reduction or 'attenuation' of nitrate contamination of groundwater and surface waters. We investigated subsurface denitrification characteristics at four sites under pastoral farming in the Manawatū River catchment, in the lower North Island, NZ. Laboratory incubations measured denitrification potential in the vadose zone layers. In-situ push-pull tests measured denitrification rates in the shallow groundwaters. Soils and underlying geology influenced variability of subsurface denitrification. Nitrate reduction was greatest in fine textured soils and reducing groundwaters.

Funding

Funded by the New Zealand Ministry for Business, Innovation and Employment's Our Land and Water National Science Challenge (Toitū te Whenua, Toiora te Wai) as part of project Benign Denitrification in Groundwaters

History

Publication date

2020-10-07

Language

  • English

Does this contain Māori information or data?

  • No

Journal title

Journal of Environmental Management

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