THE INFLUENCE OF THE CONTENT OF TOTAL NITROGEN, POTASSIUM AND THE METHOD OF CULTIVATION ON SOME QUALITATIVE FEATURES OF STRAWBERRY

The qualitative composition of the ripe fruits of strawberry (hybrid variety- Alba) was examined on growing areas in Glumova (open field) and Shishova (in greenhouse conditions) in the municipality of Saraj- Skopje, with some different agrochemical characteristics, i.e. in Glumova the average total nitrogen values of 0.182% and potassium (K2O) 29.50mg/100g soil were significantly higher than those found in Shishova (0.116% and 20.24mg/100g soil). In ripe strawberry fruits, the amounts of total sugars, ascorbic acid (vitamin C), total nitrogen and potassium found were significantly dependent on the agrochemical properties and the method of their cultivation. In strawberry fruits grown in greenhouse conditions (Shishova), the amount of total sugars 3.68%, ascorbic acid (64.57 mg/100g FW), total nitrogen 9.10 mg/g-1 DM and potassium (K) 1.64 % in DM were significantly lower in relation to the average values found in strawberry samples grown in an open field (Glumova).