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A small–plot field trial was carried out from 2007 to 2009 including seven field pea (Pisum sativum L.) cultivars from the Ukraine and Bulgaria. The ecological stability in the tested pea cultivars was determined in relation to seed yield. Stability parameters were determined by the regression analysis according to the methods by Eberhart and Russell and Tai. The analysis of variance proved that the influence of the factors genotype, environment and genotype x environment and seed yield had a very high level of the probability. The cultivars Kerpo from Bulgaria and Usatii 90 from the Ukraine could be considered close to an ideal type (bi=1.04, λi=11.08; bi=1.05, λi= 1.12), suitable for growing in different environments. On the other hand, the Bulgarian Mir (bi=1.56, λi=49.41) and the Ukrainian Harkovskii Etalon (bi=1.28, λi=95.88) were identified as unstable (bi>1), but with good response that provide them with high seed yields in certain environments. The cultivars Vesela (bi=0.77, λi=6.77) from Bulgaria, Pleven 10 (bi=0.71, λi=59.49) from Bulgaria and Rezonator (bi=0.68, λi=35.07) from the Ukraine were assessed as stable (bi<1), but with a low adaptability except for Vesela. In conclusion, the cultivars Kerpo, Usatii 90 and Vesela may be regarded as suitable for including in the future hybridisation programmes and developing novel field pea lines with high and stable seed yields in contrasting environments.

SEED YIELD AS AFFECTED BY THE ECOLOGICAL STABILITY OF THE FIELD PEA (PISUM SATIVUM) CULTIVARS