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- Present address: Miljø‐og levnedsmiddel Centret, Ved Faurgården 7, DK‐4300 Holbaek.
- Present address: Landskontoret for Planteavl, Udkærsvej 15, DK‐8200 Aarhus N, Denmark.
- Corresponding author (telephone #: 45–4677–4272; fax #: 45–4677–4260; e‐mail address: [email protected]).