Variability of pomological characteristics of the Sumatovka apple
Variability refers to a process by which differences occur among individuals of the same plant species. However, some characteristics change very little while others, especially quantative ones, change rather quickly and readily even when environmental conditions change slightly. This fact has prompted an investigation aimed to establish the variability of pomological characteristics of the Sumatovka cv. apple tree, a rather old and autochthonous cultivar grown widely throughout Eastern Serbia. Its special characteristic is an ability to grow and bear fruit without any particular care and cultivation, and in conditions of especially severe water deficiency and drought. Sumatovka cv. fruits are small- or medium-sized on the average, the length Measuring 51.3 ? 6.62 mm (CV 12.9%), width 55.5 ? 6.35 mm (CV 11.4%), pedicel lenght 19.5 ? 3.2 mm (CV 16.4%) and fruit mass 66.0 ?20.6 g (CV 31.3%). Total soluble dry matter content of the mesocarp varies between 15.6 and 1.92% (CV 12.31%), total sugars 14.3 ? 4.7% (CV 32.8%) and total sour substances 0.95 ? 0.11% (CV 18.6%). Especially examined were the large-sized Sumatovka fruits measuring 72.0 mm in lenght and width, and 169.4 g in mass.