Yield stability of spring wheat (Triticum aestivum L.) in the North West Frontier Province, Pakistan

• Main Authors: Ghulam Rasul Tahir, Akhtar Ali, Abdul Jabbar Khan, Muhammad Irfaq, Tila Mohammad, Muhammad Amin
• Format: Article
• Language: English
• Published: Prince of Songkla University 2005-11-01
• Series: Songklanakarin Journal of Science and Technology (SJST)
• Subjects: wheat genotypes; varied environments; stability analysis
• Online Access: http://www.sjst.psu.ac.th/journal/27-6-pdf/02-spring-wheat.pdf

Ten promising wheat genotypes were evaluated for grain yield stability under varied environments at nine locations in the North West Frontier Province, Pakistan. The interaction between genotypes and environments (G x E) was found significant in this study. None of the regression coefficients (bi) was significantly different from variety; therefore, stable performance of the genotypes could not be predicted on ‘bi’ alone. In this study, deviations from regression (S2d) and average grain yields were used to identify the superior genotypes. Above average grain yields were observed in genotypes, CT-99022, SAW-98063, CT- 99155 and Saleem-2000. Although cultivar Saleem-2000 produced high yield, on the basis of high S2d value seemed to be sensitive upon environmental changes. Based on grain yield performance, low deviation from regression and bi values the genotype CT-99022 is more suitable for favourable and CT-99155 for unfavourable environments. Stable performance was expressed by SAW-98063 because of higher grain yield, regression coefficient (bi = .983) and low deviation from regression (S2d = 0.065).