Effect of biostimulators on root length and shoot length of seedlings of sunflower parent lines

The aim of this paper was to examine the effects of biostimulators on root and shoot length of sunflower seedling deriving from seeds treated with biostimulators prior to sowing. Experiment was conducted at the Institute of Field and Vegetable Crops on five cytoplasmic male sterile lines: OCMS: - 98 (L1), HA-NS-26 (L2), PH-BC2-74 (L3), VL-A-8 (L4), and HA-26-PR (L5). The seed was produced in the period from 2010 to 2012. Two seed variants were tested - non-treated seed and seed which was prior to application of biostimulators treated with metalaxyl-m. Prior to sowing, seed was treated with commercial preparations Slavol S, Bioplant Flora and the combination of the two. Results of this research point out that application of appropriate biostimulator has positive effect on growth and development of roots and shoots of seedling, while inadequate combination of biostimulators leads to inhibitory effect.