Correlation between parameters of ecological stability and adaptability of the cultivated plants varieties

Authors of various publications present different, frequently antipodal views on the following problem: measure of which biological traits of genotypes are their evaluations by the yield regression rates on bi environmental parameters. In connection with this problem factors of variation of this parameter with the help of soybean cultivars tests data were studied. It was experimentally and theoretically proved that value of bi parameter of the i-th cultivar is practically entirely determined by the value of the average divergence of its yield evaluations as a result of various conditions of ecological tests of cultivars. Studying the dependence of bi parameter values on the stress-resistance indices showed that bi can characterize the differences of genotypes not only by the sensitiveness to favorable condi-tions but also by their stress-resistance degree.