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In field N transfer, build-up, and leaching in ryegrass-clover mixtures

Rasmussen, J ; Eriksen, J ; Jensen, E S and Høgh-Jensen, H (2008) In field N transfer, build-up, and leaching in ryegrass-clover mixtures. In: Grassland Science in Europe, 13, pp. 559-561.

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Two field experiments investigating dynamics in grass-clover mixtures were conducted, using 15N- and 14C-labelling to trace carbon (C) and nitrogen (N) from grass (Lolium perenne L.) and clover (Trifolium repens L. and Trifolium pratense L.). The leaching of dissolved inorganic nitrogen (DIN), as measured in pore water sampled by suction cups, increased during the autumn and winter, whereas the leaching of dissolved organic nitrogen (DON) was fairly constant during this period. Leaching of 15N from the sward indicated that ryegrass was the direct source of less than 1-2 percent of the total N leaching measured, whereas N dynamics pointed to clover as an important contributor to N leaching. Sampling of roots indicates that the dynamics in smaller roots were responsible for N and C build-up in the sward, and that N became available for transfer among species and leaching from the root zone. The bi-directional transfer of N between ryegrass and clover could however not be explained only by root turnover. Other processes like direct uptake of organic N compounds, may have contributed.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Subjects: Soil > Nutrient turnover
Environmental aspects > Air and water emissions
Research affiliation: Denmark > DARCOF III (2005-2010) > ORGGRASS - Grass-clover in organic dairy farming
Deposited By: Eriksen, Professor Jørgen
ID Code:14647
Deposited On:30 Sep 2008
Last Modified:12 Apr 2010 07:38
Document Language:English
Refereed:Peer-reviewed and accepted

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