STUDY ON INFLUENCE OF SOME CONVENTIONAL AND BIOLOGICAL FERTILIZERS ON THE BIOCHEMICAL COMPOSITION OF FRESH AND DRIED FRUITS OF 'TEGERA' PLUM CULTIVAR

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Denitsa Hristova
Diyan Georgiev
Boryana Brashlyanova
Petya Ivanova

Abstract

The study presents the results of the effect of different fertilization types on the biochemical composition of fresh and dried plum fruit of 'Tegera' cultivar. The scientific experiment was carried out in 2016 at Research Institute of Mountain Stockbreeding and Agriculture - Troyan. Three fertilization types were applied in the experiment: biological, conventional and granulated chicken manure. Higher values for sugars, anthocyanins, tanning substances and pectin were reported as a result of fertilization in comparison with the control. The highest content of total polyphenols in fresh 210.00 mgGAE/100 and dried 390.00 mgGAE/100 fruit was found in the conventional fertilization. The greatest level of antioxidant activity of fresh fruit was found in the variant of chicken manure - 926.67 μmolTE /100 g and the conventional fertilization - 597.78 μmolTE/100 g, while it was 220.00 μmolTE / 100 g in dried fruit variant with the biological fertilization.

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