Content of elementary copper in hops after repeated applications of copper fungicides
2011
Krofta, K., Chmelarsky Inst., Zatec (Czech Republic) | Jezek, J., Chmelarsky Inst., Zatec (Czech Republic) | Kudrna, T., Chmelarsky Inst., Zatec (Czech Republic)
The aim of this study was to evaluate Cu concentrations in hop cones (Agnus variety) after using the following fungicides: Kuprikol 50, Kuprikol 250 SC, Cuproxat CS, Curzate K. Cu concentrations in hop cones are up to 500 mg/kg if the total amount of applied Cu does not exceed 15 kg/ha. Cu concentrations on leaves are 2-5 times higher at the same application dose. The application of 5 kg Cu/ha increases Cu concentration on hop leaves by 1,000 mg/kg at least. The same amount of Cu increases its concentration in hop cones by 300 mg/kg at the ripening period. Tight correlation between the amount of Cu applied and its concentration in hops does not exist. Cu concentration in hop cones shows decreasing trend. Similar trend was observed on hop leaves. These changes are brought about by the growth of hop cones and by washing away Cu compounds by atmospheric water. The natural concentration of Cu in hop cones and leaves varies from 20 to 25 mg/kg.
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