Kvasny Prum. 2011; 57(11-12): 417-423 | DOI: 10.18832/kp2011045

Content of elementary copper in hops after repeated applications of copper fungicides.Peer-reviewed article

Karel KROFTA, Josef JEŽEK, Tomáš KUDRNA
Chmelařský institut s.r.o., Kadaňská 2525, 438 46 Žatec

Contents of copper in hop cones are up to 500 mg/kg if total amount of applied cop per does not exceed amount the of 15 kg/ha of a hop garden. Contents of copper on leaves are 2-5 times higher at the same application dose. Application of 5 kg copper per one hectare of vi gorous growth of Agnus variety increases content of copper on hop leaves by 1000 mg/kg at least. The same amout of copper increases its content in hop cones by 300 mg/kg at the ripening period. Tight correlation between the amount of copper applied and its content in hops does not exist. Elementary copper from leaves is brought into harvested hops in the form of biological admixtures. Copper content in hop cones shows decreasing trend, which is given by gradual in crease of cones size at the ripening period. Similar trend on hop leaves shows that washing and dissolving of copper compounds by atmospheric water can participate in this process as well. Common content of copper in hop cones and leaves is up to 20-25 mg/kg.Contents of copper in hop cones are up to 500 mg/kg if total amount of applied cop per does not exceed amount the of 15 kg/ha of a hop garden. Contents of copper on leaves are 2-5 times higher at the same application dose. Application of 5 kg copper per one hectare of vi gorous growth of Agnus variety increases content of copper on hop leaves by 1000 mg/kg at least. The same amout of copper increases its content in hop cones by 300 mg/kg at the ripening period. Tight correlation between the amount of copper applied and its content in hops does not exist. Elementary copper from leaves is brought into harvested hops in the form of biological admixtures. Copper content in hop cones shows decreasing trend, which is given by gradual in crease of cones size at the ripening period. Similar trend on hop leaves shows that washing and dissolving of copper compounds by atmospheric water can participate in this process as well. Common content of copper in hop cones and leaves is up to 20-25 mg/kg.

Keywords: hop, copper, downy mildew, fungicides

Received: May 28, 2011; Accepted: October 20, 2011; Published: November 1, 2011 

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