Assessment of the ecological plasticity of early and medium-early potato varieties in the Kamchatka Krai. G.P. VLASENKO

Abstract

Assessment of the ecological plasticity of early and medium-early potato varieties in the Kamchatka Krai. G.P. VLASENKO (Kamchatka Research Institute of Agriculture, Kamchatka Krai, Yelizovsky district, Sosnovka village).

The results of the evaluation of potato varieties by the parameters of ecological plasticity, stability, adaptability in the conditions of a short growing season are presented. Based on the performed analysis to the plastic varieties whose productivity varies in accordance with changes in environmental conditions, combining high yield and stability (with a regression coefficient b_i ≥ 1.0) include Fresco, Jubilyar, Sante, Evolution, Severyanin. Selected variety Arizona (b_i = 1.42; S²d = 8.99) of the intensive type, characterized by high yield, responsiveness to changes in growing conditions, but having low stability. Neutral varieties (bi close to zero) weakly responding to changes in the environment include: early-maturing varieties – Kamensky, Baron; medium-early varieties – Otrada, Mayak. The medium-early varieties Irbitsky and Pamyati Rogacheva are characterized by high plasticity (b_i = 1.45 and 1.3, respectively) and stability (S²d = 0.74 and 0.05), but relatively low yield (22.6 and 22.3 t/ha). Based on the regression coefficient, the Lilya Belorusskaya variety can be called plastic (23.0 t / ha; b_i = 0.91; S²d =10.12), 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, Evolution, Sante, Fresco, Severyanin, and Jubilyar are characterized by high adaptability to the conditions of a short growing season with low heat supply.