info:oai:orgprints.org:9823info:ofi/fmt:xml:xsd:bookLøesAnne-KristinLøes, Anne-KristinHenriksenTrond MaukonHenriksen, Trond MaukonEltunRagnarEltun, Ragnar2007N supply in stockless organic cereal production under northern temperate conditions. Undersown legumes, or whole-season green manure?proceeding