Beschreibung:
Abstract We carried out foliar fertilization trials with copper-tetramine-hydroxide complex compounds on small plots with alluvial Danube soils of high CaCO3content, alkaline pH and copper deficiency. Copper treatments were applied in the phenological phases of shooting and flowering. Applied copper doses amounted 0.1, 0.3, 0.5, 1.0 and 2.0 kg/ha. In our investigations we searched for the symptoms of stress induced by higher copper doses on yield, gluten and raw protein content. Testing the yields we observed that higher doses at booting treatments resulted in gradually increasing yields. In treatments at flowering copper doses of 0.5kg/ha still increased yields but higher doses induced stress that produced a decrease in yields. Gluten content shows maximum curve as an effect of copper treatments at both booting and flowering. Maximum gluten content could be achieved at copper doses of 1.0 kg/ha at phenological phase of booting, and of 0.5 kg/ha at flowering. Raw protein content shows maximum curve similarly to the changes of gluten content in copper fertilization trials after treatments at booting and flowering. While a decrease in raw protein content was produced as a result of stress after treatments of 1.0 kg/ha at booting, lower copper doses of 0.5kg/ha reduced protein content after treatments at flowering.