Estimation of stability parameters for yield and its components traits under foliar application of baker’s yeast at different concentrations and fermentation periods in genotypes of roselle (Hibiscus sabdariffa)

A field experiment was conducted during the summer growing season of 2025 at one of the fields of the Agricultural Research and Experimentation Center, College of Agriculture, University of Kirkuk, Iraq. The study aimed to investigate the effect of genotypes (Hit Black, Hit Red, Areb, and Sudan-3) and foliar application of different concentrations of dry baker’s yeast suspension under two fermentation periods (control treatment, 3 g/96 h, 6 g/96 h, 9 g/96 h, 3 g/120 h, 6 g/120 h, and 9 g/120 h). The experiment was arranged according to a Randomized Complete Block Design (R.C.B.D.) within a factorial experiment, with three replicates. The studied genotypes exhibited clear variation in their degree of stability across different environments. The genotype Hit Red demonstrated stability in most traits, including calyx yield, seed yield, and several other characteristics. However, it did not exhibit stability in days from sowing to 50% flowering, number of branches, and fresh and dry capsule weight..