Studying of a possibility of sunflower plants selection on a decreasing of a stem bending under the flower head

There were defined characteristics of some morphometric traits of sunflower varieties and hybrids which develop their attractive appearance and provide commercial attraction as goods on a seed market. There were used 17 promising and permitted for production varieties and 17 hybrids of sunflower in the work. There were determined the meanings of a plant height, a stem bending under the flower head, a height of a flower head placing. The sunflower varieties and hybrids having the maximal and minimal meanings of studying traits were selected. There was analyzed the stability of such traits as a height of a flower head placing and a stem bending under a flower head, and their connections with a plant height. The results for all years of the research showed that selection on a decreasing of a stem bending under a flower head can be conducted only on a trait ‘a height of a flower head placing’ in the sunflower varieties. But the same selection in the sunflower hybrids can be done only on a trait ‘stem bending under a flower head’ not estimating the meaning of the trait ‘a height of a flower head placing’.