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Methodological aspects of determining nitrogen fixation of different forage legumes

Loges, Ralf; Ingwersen, Kathrin; Kaske, Axel and Taube, Friedhelm (2000) Methodological aspects of determining nitrogen fixation of different forage legumes. [Methodische Aspekte zur Bestimmung der symbiontischen N2-Fixierungsleistung verschiedener Futterleguminosen.] In: Alföldi, Thomas; Lockeretz, William and Niggli, Urs (Eds.) Proceedings 13th International IFOAM Scientific Conference, IFOAM 2000 - The World Grows Organic, vdf Hochschulverlag AG an der ETH Zürich, -92.

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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:forage legumes, biological N-fixation, nitrogen fixation, natural 15N abundance method, 15N enrichment technique, red clover, alfalfa, white clover
Subjects: Soil > Nutrient turnover
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
Deposited By: Loges, Dr. Ralf
ID Code:2146
Deposited On:13 Jan 2004
Last Modified:12 Apr 2010 07:28
Document Language:English
Status:Published
Refereed:Not peer-reviewed
Additional Publishing Information:Further Information about the Proceedings at http://www.vdf.ethz.ch/info/2754.html (Accessed 20.12.03)

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