The article presents the results of a comparative study conducted in the southern agroclimatic zone of the republic (Gantsevichi District, Brest Region) within two field trials with low and high soil fertility. The study examined the effects of growth-promoting biological preparations – Golubika Peat Oxidate with microelements at a concentration of 0.4 % and the new microbial preparation Ecoberit at concentrations of 2, 4, and 8 % – on the antioxidant and enzymatic activity of highbush blueberry fruits. It was established that, regardless of the agrochemical background, the most effective agricultural practice, providing maximum protection of cellular structures from oxidative stress, was the application of a 0.4 % solution of Peat Oxidate to the near-trunk zone of blueberry plantings. It was shown that on low-fertility soil, the use of a 4 % Ecoberit solution was 1.5 times less effective than the leading agricultural practice; while the 8 % solution was 5 times less effective; and while the 2 % solution was completely ineffective. On high-fertility soil, the overall antioxidant protection level with Peat Oxidate was almost half that of less fertile soil, while the negative impact of Ecoberit on the antiradical properties of fruits was absolutely dominant. This was most pronounced with the 8 % solution, while the 4 % solution was 1.3 times less effective.

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