In the study the results of ecological variety trial of 17 pea varieties undertaken in the three points located in the forest-steppe (point “Tashtyp”), steppe (“Shira”) and dry-steppe (point “Zelenoe”) zones of the Khakas Republic in 2016-2017 are presented. The three-way analysis of variance has allowed establishing the share of the influence of variability factors (year, point, variety) on protein deposition in grain of 17 pea varieties. In total from the experiment the protein content in pea grain was 25.2 % in 2016 and 26.04 % in 2017. “Point” factor pro-moted protein deposition in grain by 22 %. During two years of research the average protein content was regis-tered within 24.93 % in the point of “Shira”, 26.12 % in the point “Zelenoe” and 25.85 % in the point “Tashtyp”. Va-rietal differences determined the symptom forming only by 9 %. From experiment varieties Radomir, Yakhont, Omsky 18, Agrointel 2, Buslay and Krepysh had the average protein content in grain about 26 % in total. However, its highest content was noticed in the variety Ruslan (27.63 %). The genotype-environment interac-tion was in control by 5 % level of significance and cor-respondingly it was possible to calculate the adaptability parameters by the method of S.A. Eberhart and W.A. Russell (1966). The adaptability parameters were calculated by different methods. On the basis of the calculation of variation coefficients it can be stated that this symptom is stable in years and points of cultivation. The differences between varieties of the symptom Hom were marked. The highest homeostasis by protein con-tent in grain was determined in the varieties Yamal 2 (Hom = 3071.48), Agrointel 2 (Hom = 2069.55), Yamal (Hom = 1973.08), Kemchug (Hom = 1837.50). The re-sults of the calculation of ecological plasticity parame-ters allowed dividing varieties into groups of more or less than 1, and also equaling to 1. Varieties Shrek (bi = 2.60), Spartak (bi = 1.72), Ruslan (bi = 1.68), Altai universal (bi = 1.65) were included to the group (bi > 1). These varieties demand higher cultural practices. Bi of varieties Radomir and Thomas is at the range of 1, therefore variety requirements to environment condi-tions and growth environment in experiment were corre-sponding. The highest stability (σ2d) by protein content in grain was in varieties Ruslan (σ2d = 0.09), Yamal 2 (σ2d = 0.29) and Kemchug (σ2d = 0.32).
pea, protein, forest-steppe, steppe, dry-steppe, parameters of adaptibility, ecological variety trial
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