Genotypic features the response of the antioxidant complex of blueberry fruits (Vaccinium corymbosum L.) to the use of mineral and organic fertilizers on lowland peatland

The results of a comparative study of the influence of mineral and organic fertilizers - N16P16K16, Nanoplant, Hydrohumate, and Ecosil - on the state of the antioxidant complex of early-ripening (Northcountry, Croaton) and mid-ripening (Bluecrop, Northland) varieties of tall blueberries in an experimental culture on a low-lying peat bog in the Central agroclimatic zone of Belarus are presented. A significant dependence of changes in the level of their antioxidant and enzymatic activity on the type of fertilizers and the genotype of plants is shown. In most varieties, the increase in mineral nutrition contributed to an increase in the antioxidant activity level up to 28 %, the most significant when using Nanoplant and Hydrogumate. Revealed a distinct antagonism in changing the activity of peroxidase and catalase, on the one hand, and polyphenol oxidase, on the other: it increases synchronously in the first pair of enzymes to 77 and 30 % in varieties Northcountry, 171 and 152 % in the variety Croaton, 137 and 182 % in the variety Bluecrop and to 122 % of varieties for the Northland, against a preferential decrease in the activity of polyphenol oxidase in 13-55 %.In most cases, the tested agricultural practices have contributed to raising the general level oxidase activity of blueberry fruit. Especially in Croaton and Bluecrop varieties, by 30-310 %, with the highest efficiency of organic fertilizers, especially Hydrohumate. Nanoplant treatments had an inhibitory effect on the general level oxidase activity in Northcountry and Northland varieties and a stimulating effect in Croaton and Bluecrop varieties.