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Gylfadottir, T., Helgadóttir, Áslaug (1953-), Zielke, M. 2005 Nitrogen status of white clover and grass mixtures in early spring. In: Workshop on Sward dynamics, N-flows and forage utilisation in legume-based systems - Proceedings of the 2nd COST 852 worshop held in Grado, Italy 10-12 November 2005. : 231-234.