Nitrous oxide emissions from dairy pasture systems in New Zealand
Animal excreta deposited during grazing are the single largest source of nitrous oxide ( N2 O) from agriculture in New Zealand.N2 O gas is formed in soils during nitrification and denitrification processes and these processes are affected by many soil and climatic factors (e.g., soil water‐filled pore space (WFPS) and nitrate concentrations).There are a number of possible management options that can reduce N2 O emission from dairy farms (Clark et al.2005).These options include using restricted grazing regimes to reduce excreta‐N deposited onto wet soil and using low‐N feed supplements (e.g.maize) as an alternative to using N‐rich pasture.A dairy farm system study was carried out to evaluate effects of these options on N2 O emissions.In this paper we summarise N2 O emission data and environmental efficiencies in terms of N2 O emissions per unit of milk production obtained from this study.
dairy farm nitrous oxide grazed pasture maize supplement New Zealand
J.Luo S.B.Lindsey S.F.Ledgard W.Sun M Kear
AgResearch,Ruakura Research Centre,Private Bag 3123,Hamilton,New Zealand
国际会议
呼和浩特
英文
2008-06-29（万方平台首次上网日期，不代表论文的发表时间）