Gylfadóttir, Thórey; Helgadóttir, Áslaug and Høgh-Jensen, Henning (2007) Consequences of including adapted white clover in northern European grassland: transfer and deposition of nitrogen. Plant and Soil, 297, pp. 93-104.
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The interspecific transfer of nitrogen (N) between white clover (Trifolium repens) and smooth meadow grass (Poa pratensis) in legume-based grasslands was assessed under North European field conditions using 15N individual plant leaf labelling. On average 50% of N in the grass was transferred from the white clover and about 6% of N in white clover was transferred from the grass. This corresponds to 2.5 and 0.3 g N m-2 being transferred over the growing season between the two species respectively and demonstrates that a significant part of the total N of the grass is coming through interspecific transfer. The majority of the 15N transferred was within a period of 20 days at relatively low soil temperatures. This implies that there is a need for a new focus on direct transfer pathways or exudation and transfer of organic N sources. Rhizodeposition in the top 10 cm of the soil was found to be 2.98 g N m-2 on average over the growing season for the grass and white clover mixture. Inclusion of adapted white clover varieties in the low-input grassland systems of northern Europe will lead to a substantial contribution of N.
|EPrint Type:||Journal paper|
|Keywords:||Bi-directional N transfer, grassland, legumes, N dynamics, N transfer, rhizodeposition|
|Subjects:|| Environmental aspects > Landscape and recreation|
Farming Systems > Farm nutrient management
Environmental aspects > Biodiversity and ecosystem services
|Research affiliation:||Denmark > KU - University of Copenhagen|
|Deposited By:||Jensen, Dr Henning Høgh|
|Deposited On:||09 Oct 2007|
|Last Modified:||12 Apr 2010 07:35|
|Refereed:||Peer-reviewed and accepted|
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