Seed viability of common ragweed (Ambrosia artemisiifolia L.) is affected by seed origin and age, but also by testing method and laboratory by Rea Maria Hall, Bernhard Urban, Hana Skalova, Lenka Moravcová, Ulrike Sölter, Uwe Starfinger, Gabriela Kazinczi, Johan van Valkenburg, Annamaria Fenesi, Bojan Konstantinovic, Ahmet Uludag, Suzanne Lommen, Gerhard Karrer

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