Fræðaþing landbúnaðarins - 16.02.2007, Blaðsíða 296

294 • Fræðaþing landbúnaðarins 4, 2007
Hólmgeir Bjömsson, 1975. Köfhunarefni og grasspretta. Freyr 71, 330-337.
Hólmgeir Bjömsson og Aslaug Helgadóttir 1988. The effect of temperature variation on grass yield in
Iceland, and the implication for dairy farming. In: Impact of Climatic Variations on Agriculmre. Vol. I.
Assessments in Cool Temperature and Cold Regions (eds M.L. Parry, T.R. Carter & N.T. Konijn). Kluwer
Academic Publishers Group, Dordrecht, 445-474.
Hólmgeir Bjömsson 2001. Viðhald næringarefna í túnrækt. Ráðunautafundur 2001, 51-64.
Hólmgeir Bjömsson, Þorsteinn Guðmundsson og Guðni Þorvaldsson 2007. Ahrif P- og K-áburðar á reitum
sem fengu mismikinn áburð í 55 ár. Fræðaþing 2007, í þessu hefti.
Johnston, A.E. 1997. The Value of Long-Term Field Experiments in Agricultural, Ecological, and Environ-
mental Research. Advances in Agronomy 59, 291-333.
Körchens 1997. Die wichtigsten Dauerfeldversuche der Welt. Úbersicht, Bedeutung, Ergebnisse. Arch.
Acker-Pfl. Boden. 42, 157-168.
Ríkharð Brynjólfsson, 2005. Þróun N-svömnar í langtímatilraunum á Hvannevri rveggspialdl. Fræðaþing
landbúnaðarins 2005: 436-437.
Sigfús Ólafsson, 1974. Fysiske og fysisk-kemiske studier af islandske jordtyper. Licentiatritgerð. Den
kongelige Veterinær- og Landbohöjskole, Köbenhavn, 151 bls.
Smith, P., D.S. Powlson, J.U. Smith, E.T. Elliot (eds) 1997. Special Issue - Evaluation and comparison of
soil organic matter models. Geoderma 81, 1-2
Wemer W. 2006. Dúngung von Böden. In: Blume et.al. Handbuch der Bodenkunde. 26. Erganzungsliefer-
ung 11/06. Eco Med Verlag 63 Seiten
Þorsteinn Guðmundsson 1991: Jarðvegsrannsóknir á tilraunasvæðunum. 1 Ingvi Thorsteinsson (útg.) Up-
pgræðsla á Auðkúluheiði og Eyvindarstaðaheiði 1981-1989. Fjölrit RALA 151, 51-70.
Thorsteinn Gudmundsson, H. Bjömsson and G. Thorvaldsson, 2004. Organic carbon accumulation and pH
changes in an Andic Gleysol under a long-term fertiliser experiment in Iceland. Catena 56, bls 225-238.
Þorsteinn Guðmundsson, Hólmgeir Bjömsson og Guðni Þorvaldsson 2005a. The balance of C, N, P and K
in a long term grasssland experiment in Iceland. In Book of Abstracts, Intemational conference on: The role
of long-term field experiments in agricultural and ecological sciences and Practical Solutions for Managing
Optimum C and N contents in Agricultural Soils. Prague June 22nd - 24th 2005 page 31.
Þorsteinn Guðmundsson, Hólmgeir Bjömsson og Guðni Þorvaldsson 2005b. Trace elements and heavy met-
als in a long term field trial on an Andic Gleysol in Iceland. In Thorvaldsson G and Jonsdottir RS (eds.) Es-
sential trace elements for plants, animals and humans, NJF seminar no. 370, Reykjavík, Iceland. pp 77-79.
Þorsteinn Guðmundsson, Hólmgeir Bjömsson og Guðni Þorvaldsson 2005c. Elemental composition, frac-
tions and balance of nutrients in an andic gleysol under a long-term fertiliser experiment in Iceland. Icelan-
dic Agricultural Sciences 18-19, 21-32.
Þorsteinn Guðmundsson, Hólmgeir Bjömsson og Guðni Þorvaldsson 2006. Ahrif N-áburðar á efnasam-
setningu jarðvegs. Fræðaþing landbúnaðarins 2006, 190-196.
GCTE Soil Organic Matter Network. skoðað 2007. http://www.rothamsted.bbsrc.ac.uk/aen/somnet/
index.htm