Published in Scientific Papers. Series B, Horticulture, Vol. LXV, Issue 1
Written by Georgi POPSKI, Boryana STEFANOVA, Petko MINKOV
The chemical composition of fresh plum fruits of 'Katinka’ cultivar was studied for a 5-year period (2015-2020) in an experimental plum plantation of RIMSA Troyan. The soil surface in the plantation is maintained in three treatments - black fallow, natural grassland and artificial grassland. It was found that the content of dry matter and acids in the fruits of 'Katinka’ were not affected by the way the soil surface was managed. These indicators varied relatively little over the years, in the range of less than 1.5% for dry matter and from 0.41% to 0.82% for acids. There was a higher percentage of total sugars in fruits in the artificial grassland for all years of the study period and varied from 9.05% to 11.60%. The most favourable values for the ratio between sugar and acids in fruits (glucoacidimetric coefficient) were reported in the artificial grassland, which is important for the formation of good taste qualities of the fruits with variation over the years from 13.89-27.07. In the case of fallow and natural grassland treatments, a high correlation dependence was established between the content of organic acids and inverted sugar.
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