Testing and characterizaion of potato varieties grown in Moscow оblast

Experiments were conducted during the period of 2021–2023 to examine 33 potato varieties of diff erent geographical origin grown in the Moscow Oblast, Russia. Udacha and Golubizna were used as reference standards for 16 early-ripening and 17 medium- and late-ripening varieties, respectively. The varieties were assessed in terms of their total and marketable bush productivity, the number and average weight of tubers in the bush (total and marketable), and the share of marketable tubers in the total weight. Annual variability in the total and marketable productivity of the varieties was evaluated in terms of their adaptive capacity (K ad ), and stability index (PUSS), coefficient of ecological plasticity (bi), and environmental stability (s 2 d ). The varieties characterized by a large (91–118 g) tuber size, on average, during the experimental period of three years were identified, including Courtney, Charoit, Fritella, Tescha (Russia), Pershatsvet, Pearlamutroviy (Belarus), Newton (USA), Labadia (Netherlands). Among them, the early varieties Courtney and Labadia, as well as the late maturing Pearlamutroviy annually exceeded the reference standard in terms of this indicator. The varieties with the ability to form tubers with an average weight of 132–155 g in favorable years included Pershatsvet, Pearlamutroviy (Belarus), Sandrin (Germany), Labadia (Netherlands), Charoit, Tescha, and the Golubizna standard (Russia). The late varieties Varyag (Russia) and Garantia (Belarus) annually surpassed the Golubizna reference variety in the number of tubers per hill and in the number of marketable tubers per hill, respectively. The medium-early variety Courtney (Russia) was distinguished by a set of traits, exceeding the Udacha reference variety in terms of total (by 7 %) and marketable (by 13 %) productivity due to high indices of tuber size, tuber number, and marketability. Courtney showed high K ad (1.3 and 1.4) and PUSS (125 and 136%) parameters in the total and marketable productivity, respectively. This variety also demonstrated high stability (s 2 d = 0.01 and 0.00) but insufficient plasticity (bi = 0.9 and 0.8).