Genotype-environment interaction, yield, performance and stability of wheat varieties grown in diverse environments [electronic resource].

Includes references.

A field experiment through a split -plot arrangement, was carried out in two locations (old land "OL" and new a reclaimed land "NL ") during 1998/99 (Y₁) and 1999/2000 (Y₂) seasons, using eight wheat varieties planted on two sowing dates (D₁ & D₂). So, the varieties evaluated under the conditions of eight diverse environments. i.e.4 old- land environments and 4 newly reclaimed-land. Separate analysis of variance for each environment was performed. Bartlett's test indicated homogeneity of error terms allowing combined analysis of variance over environments. The stability variance analysis was computed. Six stability statistics were used to detect the phenotypic stability of each variety across a set of environments for grain yield and some of its attributes. Combined split-plot analysis of variance revealed considerable effects of sowing dates, on all characters except harvest index due to locations, and on all characters in most cases due to 1st, 2nd, and 3rd order interactions. Yield performance of the tested varieties showed different rankings across the eight environments due to VE interaction and therefore, discussed on the basis of Y₁ vs. Y₂ and D₁ vs. D₂ in each location (OL & NL). V₁, v₄ and v₈ in old land as well as V₁, V₈ and v₇ in new reclaimed land were well adapted and highly Yielding varieties, whereas V₃ was the worst in both lands. Great similarity was detected between CV¡ % and each of r¡². S²d¡ and / or b as well as between r¡² and S²d¡ as measures for variety stability.

Summary in Arabic.

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