PRODUCTIVE CAPABILITIES OF PROMISING VARIETIES OF WHEAT (Triticum aestivum L.)

The present research paper aims at comparing the similarity and remoteness of influence of the features of eight common wheat varieties and their grouping on the base of important structural indicators through the use of a mathematical approach and a cluster analysis; studying of a relationships between the examined indicators in order to make more objective evaluation using the possibilities of the factor analysis; reducing the number of correlating indicators into new factors. Two-year data were used, obtained from the examination of eight common wheat varieties. The subject of the present research were seven seven foreign varieties of wheat -Ingenio, Bologna, Dalara, Moyson, Falado, Gabrio, Pibrak, and the eighth variety -Factor -was a local Bulgarian selection. The introduction of common wheat varieties is related to the study of their productivity and ecological plasticity. For this purpose there were reported and analised yield structural elements: plant height, wheat-ear length, number of ears, number of grains per ear, weight of grains per ear, grain yield from hectare. The cluster analysis showed that the influence of wheat variety on the qualitative indicators led to their grouping into two new clusters. There was established a strong positive correlation between the number of grains per ear and the hectoliter mass (r = 0.811) as well as between the number of ears and the weight of grains per ear (r = 0.771). The correlation coefficient between the number and weight of grains -(r = 0.649). The factor analysis established the influence of three main factors influencing the group formation of wheat varieties. The first factor was related basically to plant height, ear length, number of grains per ear and hectoliter mass. The second component was basically related to the number of ears and weight of grains. The third factor was related to the mass of 1000 grains.