Journal article

The environmental impact of nitrogen fertiliser use on dairy pastures

RJ Eckard, DF Chapman, RE White, D Chen

AUSTRALIAN JOURNAL OF DAIRY TECHNOLOGY | DAIRY INDUSTRY ASSOC AUSTRALIA | Published : 2004

Abstract

Nitrogen (N) fertiliser use on dairy pastures in south-eastern Australia has increased exponentially over the past 20 years, leading to increasing concern about NO 3 leaching to groundwaters and streams, and the contribution of N 2O emissions to global warming. Volatilisation, denitrification and leaching of N were measured from pastures receiving no N fertiliser (grass/clover), or 200 kg N/ha applied as urea (46%N) or ammonium nitrate (34.5% N). Nitrate leaching and denitrification losses from ammonium nitrate fertiliser were significantly higher than from urea, while the reverse was noted for volatilisation losses. Volatilisation losses were lowest in winter and highest in summer (6-14% of..

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