Now showing items 11-20 of 138
Confirmation of co-denitrification in grazed grassland
(Nature Publishing Group, 2015-11-30)
Pasture-based livestock systems are often associated with losses of reactive forms of nitrogen (N) to the environment. Research has focused on losses to air and water due to the health, economic and environmental impacts ...
Potential pasture nitrogen concentrations and uptake from autumn or spring applied cow urine and DCD under field conditions
Nitrogen (N) cycling and losses in grazed grassland are strongly driven by urine N deposition by grazing ruminants. The objective of this study was to quantify pasture N concentrations, yield and N uptake following autumn ...
The fate of urine nitrogen: A grassland lysimeter study in Ireland
(Fertilizer and Lime Research Centre, 2014-02)
In grazed pasture systems, the nitrogen (N) contained in a cattle urine patch may be up to 1200 kg N ha⁻¹. The majority of this N is in excess of plant requirements and is vulnerable to environmental loss. In this study, ...
Nitrate leaching and nitrous oxide emissions related to bacteria and not to archaea in nitrogen rich grassland soils
(International Union of Soil Sciences, 2010-08)
The oxidation of ammonia (NH₃) to nitrate (NO₃⁻) is a key process in the global nitrogen (N) cycle which has major ecological and environmental implications both in influencing nitrous oxide (N₂O) emissions and NO₃⁻ leaching. ...
Use of a urine meter to detect variation in urination behaviour of dairy cows on winter crops
(New Zealand Society of Animal Production, 2015-06-30)
Nitrate leaching loss from urine patches is predicted using a number of variables including urine N concentration, number of urine patches produced, and urine patch size however, there is a lack of quantitative data on the ...
The potential role of the nitrification inhibitor DCD for reducing nitrate leaching from grazed grassland
(Agricultural Research Forum 2008., 2008-03)
The objective of this lysimeter experiment was to assess the effect of DCD (dicyandiamide), a commercially used nitrification inhibitor, on nitrate leaching from Irish grassland soils after urine and fertiliser applications.
Nitrogen fertilizer and urine patch interaction-use of APSIM to aid experimental design
(Fertilizer and Lime Research Centre, Massey University, 2011-02)
Previous studies have shown that leaching losses from pasture-based systems occurs predominantly from urine deposited by grazing animals, but also following fertiliser application. However, there is limited understanding ...
A synergistic mitigation technology for nitrate leaching and nitrous oxide emissions for pastoral agriculture
(International Nitrogen Workshop 2012., 2012)
In grazed grassland, most of the nitrate (NO3-) leaching and nitrous oxide (N2O) emissions come from the animal urine-N returned to the pasture by the animal during outdoor grazing (Di and Cameron, 2002a). The N loading ...
Dairying and the environment
(South Island Dairy Event (SIDE), 2001-06)
Over the past decade, there has been a rapid increase in dairy farming in the South Island. A number of the newly established dairy farms are on free-draining course-textured or stony soils. Nitrate leaching from intensive ...
Seasonal fluctuations in phosphorus loss by leaching from a grassland soil
(Soil Science Society of America, 2004)
Phosphorus losses from soils have been reported to impair the water quality, resulting in deaths of fish and other marine animals, and can harm human health. The objective of this study was to determine the seasonal ...