RESULTS OF COMPARISON EVALUATION OF POTATOES TO YEILD AND ADAPTIVE CHARACTERISTICS IN THE KAMCHATKA REGION CONDITIONS

Abstract

The results of the evaluation of potato varieties on ecological plasticity, stability, adaptability in conditions of a short growing season are presented. Based on the analysis, plastic varieties whose productivity varies according to changes in environmental conditions combining high yield and stability (with a regression coefficient b_i ? 1.0) include Fresco (26,8 t/ha; b_i = 1,21; S_i² = 1,42), Jubilyar (26,0 t/ha; b_i = 1,1; S_i² = 0,44), Sante (28,1 t/ha; b_i = 1,14; S_i² = 2,18), Evolution (28,0 t/ha, b_i = 0,93; S_i² = 1,93), Severyanin (26,3 t/ha, b_i = 1,0; S_i² = 1,57). The Arizona variety (b_i=1,43; S_i² =6,04) of intensive type, characterized by high yield, responsiveness to changes in growing conditions, but having low stability, was isolated. Neutral varieties (b_i close to zero) that react poorly to environmental changes include: early-ripening varieties - Kamensky, Baron; medium–early – Ma-yak. The medium-early varieties Irbitsky and Pamyati Rogacheva  are characterized by high productivity (b_i =1,46 and 1,3, respectively) and stability (S_i² = 1,38 and 0,18), but relatively low yields (22,0 and 22,5 t/ha). Based on the regression coefficient, the Belarusian Lilia variety can be called plastic (22,6 t/ha; b_i= 0,92; S_i²= 5,45), but at the same time it has the lowest stability index, that is, the variety depends on the conditions of the year and its behavior is unpredictable. The varieties Arizona (1,25), Evolution (1,18), Severyanin (1,10), Jubilyar (1,07) are distinguished by their high adaptability to the conditions of a short growing season with low heat supply. Potato varieties are recommended for cultivation in the conditions of the Kamchatka Territory.