Dynamics of rogue propagation in fiber flax seeds in the process of reproduction them in primary seed breeding plots

The most common cause of varietal impurities in crops of Fiber flax is a failure to comply with the main provisions of internal control when working with several varieties of flax on the farm or as a result of variety changing. Field testing does not always give a correct assessment of the crop condition of varietal purity. Due to the morphological similarity of the flax varieties, grab analysis fails to determine the percentage of mechanical rogue of fiber flax and to follow up their further propagation in crops. The goal of research is to study the dynamics of reproduction of fiber flax rogue having a yellow color of seeds as a marker in contaminated fiber flax seeds in course of their four years replanting. The research is to ascertain the varietal purity index of flax seeds category OS in GOST R 52325-2005. The research was carried out in 2015-2018 in the Experimental field of the Flax Institute (Torzhok district, Tver region). The study objects included plants and seeds of flax varieties Antey (check plot). The use of fiber flax rogue with a marker sign of seeds has allowed to specify rogue content in the crop at seeds propagating in primary seed breeding plots. We found out that in the first three years of the reproduction of seeds of the first and second reproduction years and the foundation stock seeds of the first year reproduction the quantity of fiber flax rogue in the crop at an impurity from 0.2 to 0.7% changed by ±0.1-0.2%;. In case of rogue content of 1% - an annual increase was by 0.2; 0.4 and 1.0%. In the primary seed breeding plots of foundation stock seeds of the second year, the content of rogue in the harvest increased by 0.3-0.6% (in 1.8-2.0 times) compared to the original. There was no increase in the content of rogue in the crop only with a minimum and maximum of its content in the initial seeds - 0.2 and 1.0%, respectively.