The Grain Yield Performance and Stability Characters of Several Spring Wheat Genotypes in Transylvanian Plain Conditions

Abstract

The current study presents some stability parameters (coefficient of variation, environment variation, regression coefficient, deviation from regression, coefficient of determination and ecovalence) of grain yields and the main components of its. Twenty-two spring wheat cultivars were tested in yield trials during three years being analyzed the number of grains per spike, thousand kernel weight and spike density The genotypes: Durom and Marcius indicated over the experimental years, a high stability for grain yield, based on three or more parameters (CV, s2, b, sd2) and a good adaptation. Corso and Henica genotypes have a good stability for number of grains per spike with a medium number of grains, and TD 1524-71 is the most unstable genotype for thousand kernel weight. Regarding the correlation between stability parameters for analyzing characters there is a different and additional reaction according to differently performance of genotype.

Assessing the Impact of Nitrogen Fertilization, Variety Selection, Year and Their Interaction on Wheat Yield and Yield Components

“…The 'Faraj' variety seems to have been bred with a focus on spike density-a trait highlighted for its importance in wheat yield by Joudi et al (2017) [54]. The association of the 'Nassira' variety with high TKW suggests an emphasis on breeding for grain weight-a trait positively correlated with grain yield, as reported by Alonso et al (2018) [55] and Racz et al (2019) [56]. The positioning of the older variety, 'Karim', on the opposite side of the bi-plot suggests that it might possess different agronomic characteristics, likely due to different selection pressures during its development.…”