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Greinin er byggð á hluta af ritgerð Hafdísar Sturlaugsdóttur til M.Sc. í Náttúru og
Umhverfísfræðum við Landbúnaðarháskóla íslands vorið 2008 (Hafdís
Sturlaugsdóttir, 2008). Rannsóknin fékk fjárhagslega stuðning frá Framleiðnisjóði
landbúnaðarins, Blikastaðasjóði og frá Framkvæmdasjóði búvörusamninga.
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