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Methodological aspects of determination of biological N-fixation of different forage legumes [Methodische Aspekte der Bestimmung der biologischen N-Fixierung verschiedener Futterleguminosen]

Loges, Ralf and Taube, Friedhelm (2002) Methodological aspects of determination of biological N-fixation of different forage legumes [Methodische Aspekte der Bestimmung der biologischen N-Fixierung verschiedener Futterleguminosen]. In: Helgadóttir, A. and Dalmannsdóttir, S. (Eds.) Proceedings of the kick-off meeting, Solsona, Spain. Quality legume-based forage systems for contrasting environments., Reykjavík: Agricultural Reserach Institute, pp. 101-104.

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Summary

Knowledge about the amount of fixed nitrogen of different legume crops is very important for calculation of farm N balances. According to literature the choice of determination method may have an impact on the estimated amount of N fixed by a legume sward. The aim of the study was to compare the three most important field methods for determination of nitrogen fixation under different sward management systems. In the present study the natural 15N abundance method gave lower fixation rates than the two alternative methods (total-N-difference method and 15N enrichment technique). The determination of N fixation based only on N in harvestable plant material underestimated the amount of fixed N on average by 70 kg × ha-1 compared to techniques including also the amount of N in non harvestable plant parts.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:biological N-fixation, 15N abundance method, 15N enrichment technique, red clover, alfalfa, white clover
Subjects: Soil > Nutrient turnover
Knowledge management > Research methodology and philosophy > Specific methods
Crop husbandry > Production systems > Cereals, pulses and oilseeds
Research affiliation: Germany > Universität Kiel > Department of Crop Production and Plant Breeding > Grassland and Forage Production/Organic Farming
Related Links:http://www.iger.bbsrc.ac.uk/COST_852/COST852Homepage.html
Deposited By: Loges, Dr. Ralf
ID Code:2151
Deposited On:13 Apr 2004
Last Modified:12 Apr 2010 07:28
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted
Additional Publishing Information:Beigefügtes Dokument ist eine Preprint-Version.

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