American blueberry (Vaccinium corymbosum L.) is a perennial fruit specie with good nutritional properties. During cultivation, it is necessary to take care of good quality fertilization, protection and agrotechnical measures. Main purpose of fruit production is to achieve maximum fruiting with high amount of secondary plant metabolites. It may be achieved by applying new types of agroecological biopolymer formulations. For this thesis were prepared biopolymer formulations filled with microalgae and a chemical reagent; zinc sulfate ZnSO4 x 7H2O. Biopolymer formulations were foliarly applied on blueberry plants. Experiment was conducted with blueberry (varieties Duke and Aurora) on field of Fragaria company near town Velika Ludina, in 2021. The experiment was set up according to the RCBD in four replications. Top-dressing was applied in four different variants: 1. control – distilled water; 2. 10% microalgae solution; 3. Biopolymer formulations of zinc sulfate solution; 4. biopolymer formulations solution of microalgae. Ripe fruits were studied of pomological and chemical properties (fruit weight, pH value, soluble solids and total acids content polyphenols, flavonoids and anthocyanins). Increased amounts of polyphenols, flavonoids and anthocyanins were observed in the fruits of the cultivar 'Aurora' treated with biopolymer formulations of microcapsules with zinc and biopolymer formulations of microcapsules with microalgae (microcapsules with zinc: polyphenols 299.20 mg/100 g, flavonoids 218.75 mg/100 g, anthocyanins 88.15 mg/100 g and microcapsules with algae: polyphenols 315.91 mg/100 g, flavonoids 225.75 mg/100 g, anthocyanins 93.52 mg/100 g).