Copper fertilizers in fertilization of grapes | Gnojiva na bazi bakra u gnojidbi vinove loze

English. Copper has a historical role in the cultivation of vines. Copper or copper sulphate is the first fungicide that was used against Downy mildew disease. However, in addition to the importance of copper as a fungicide, copper is also an important trace element for vines. It plays an important role in the synthesis of numerous enzymes and the synthesis and activity of the chlorophyll molecule. On historic vineyard soils, where there is a high amount of copper in the soil, there is no occurrence of copper deficiency in the vine leaf. Copper deficiency can often occur on carbonate (lime) soils, on soils with a high amount of phosphorus in the soil and on new vineyard sites, where there was no previous cultivation of vines. For copper fertilization of grapes, fertilizers containing copper in the form of chelates (Cu-EDTA) or gluconates (Cu-gluconate) are used, because inorganic forms of copper have no effect in grape fertilization. When applying copper fertilizers, it is necessary to take care of the dose of application, because high amounts of copper in the plant can cause a phytotoxic effect.

Croatian. Bakar ima povijesnu ulogu u uzgoju vinove loze. Bakar odnosno bakreni sulfat predstavlja prvi fungicid za borbu protiv plamenjače vinove loze. Međutim, osim važnosti bakra kao fungicida, bakar je istovremeno i važan mikroelement. Ima važnu ulogu u sintezi brojnih enzima i sintezi i aktivnosti molekule klorofila. Na povijesnim vinogradarskim tlima, gdje se u tlu nalazi visoka količina bakra nema pojave nedostatka bakra u listu vinove loze. Nedostatak bakra se često može javiti na karbonatnim (vapnenim) tlima, na tlima sa visokom količinom fosfora u tlu te na novim vinogradarskim položajima, gdje nije bilo prethodnog uzgoja vinove loze. Za gnojidbu vinove loze bakrom koriste se gnojiva koja sadrže bakar u obliku helata (Cu-EDTA) ili glukonata (Cu-glukonat), jer anorganski oblici bakra nemaju učinka u gnojidbi vinove loze. Kod primjene bakrenih gnojiva potrebno je voditi računa o dozi primjene, jer visoke količine bakra u biljci mogu izazvati fitotoksični učinak.