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- W4301417369 abstract "Nitrate ( ${mathrm{N}mathrm{O}}_{3}^{-}$ ) pollution of water is a serious environmental problem, as ${mathrm{N}mathrm{O}}_{3}^{-}$ can contribute to the eutrophication of surface waters, and high levels may cause methaemoglobinaemia in formula-fed infants. Grassland agriculture is a major source of diffuse ${mathrm{N}mathrm{O}}_{3}^{-}$ pollution, with much of this ${mathrm{N}mathrm{O}}_{3}^{-}$ originating from urine deposited by grazing animals. The research objective was to determine the effectiveness of a nitrification inhibitor, dicyandiamide (DCD), in reducing ${mathrm{N}mathrm{O}}_{3}^{-}$ leaching under Irish dairy farming conditions. Urine was applied in autumn to undisturbed monolith lysimeters to replicate an average cattle urination (2l of 8.6g N l -1 urine), or 344kg N ha -1 equivalent. Nitrogen (N) fertiliser was applied at 141kg ha -1 and 291kg ha -1 . DCD was applied in autumn and spring. The total annual ${mathrm{N}mathrm{O}}_{3}^{-}-mathrm{N}$ losses from urine patches on three soils ranged from 16kg to 204kg ${mathrm{N}mathrm{O}}_{3}^{-}-mathrm{N}mathrm{h}{mathrm{a}}^{-1}$ . Peak concentrations on the non-urine treatments did not exceed 6.1mg ${mathrm{N}mathrm{O}}_{3}^{-}-mathrm{N}{1}^{-1}$ , but reached 17.1—148.6mg ${mathrm{N}mathrm{O}}_{3}^{-}-mathrm{N}{1}^{-1}$ when urine was applied. DCD reduced the total ${mathrm{N}mathrm{O}}_{3}^{-}-mathrm{N}$ losses from urine treatments on the lighter soils by 38%—42%, and reduced peak ${mathrm{N}mathrm{O}}_{3}^{-}-mathrm{N}$ concentrations by over 50%. This trial has shown that DCD has the potential to significantly reduce ${mathrm{N}mathrm{O}}_{3}^{-}$ leaching losses from grazed grassland in Ireland." @default.
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- W4301417369 date "2012-01-01" @default.
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- W4301417369 title "REDUCING NITRATE LOSSES FROM SIMULATED GRAZING ON GRASSLAND LYSIMETERS IN IRELAND USING A NITRIFICATION INHIBITOR (DICYANDIAMIDE)" @default.
- W4301417369 doi "https://doi.org/10.1353/bae.2012.0032" @default.
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