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Nitrate leaching and N2-fixation in grasslands of different composition, age and management

Eriksen, J. and Vinther, F.P. (2003) Nitrate leaching and N2-fixation in grasslands of different composition, age and management. In: Abstracts for the 12th N workshop "Controlling N Flows and Losses", IGER - Institute of Grassland and Environmental Research, North Wyke, Okehampton, Devon, EX20 2SB, UK.

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Summary

Cut grassland systems usually have high N efficiency and consequently low nitrate leaching, whereas the introduction of grazing animals increases the loss potential dramatically (Jarvis, 2000). It has been demonstrated that nitrate leaching from unfertilised grass-clover swards is lower than from mineral-N fertilised swards grazed by cattle. The possible explanation for this is that the N2 fixation by pasture legumes is regulated by a natural feedback mechanism driven by soil inorganic N levels. The feedback mechanism acts as a limit to N inputs from legumes and consequently regulates the potential for N losses (Ledgard, 2001). In this paper we report 5 years (1997-2002) of nitrate leaching from four cropping sequences with different grassland frequency and management for both unfertilised grass-clover and fertilised monoculture grass. Furthermore, one year of N2 fixation in 1, 2 and 8-year-old grass-clover pastures is reported.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Poster
Subjects: Crop husbandry > Production systems > Pasture and forage crops
Crop husbandry > Production systems
Research affiliation: Denmark > DARCOF II (2000-2005) > I. 3 (BIOMOD) Interaction between nitrogen dynamics, crop production and biodiversity
Denmark > DARCOF II (2000-2005) > I.15 (NIT_GRASS) Nitrate leaching from dairy farming
Deposited By: Vinther, Senior scientist Finn P.
ID Code:1822
Deposited On:30 Oct 2003
Last Modified:12 Apr 2010 07:28
Document Language:English
Status:Published
Refereed:Not peer-reviewed

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