STABILITY ESTIMATES OF SOME MAIZE CROSSES BY GR AND AMMI EQUATIONS

H. Al-Rawi, O.; M. Elsahookie, M.; M.  A. Al-Jumaily, A.

	STABILITY ESTIMATES OF SOME MAIZE CROSSES BY GR AND AMMI EQUATIONS
The Iraqi Journal of Agricultural Science
Article 1, Volume 44, Issue 4, 2013, Pages 427-433
Authors
O. H. Al-Rawi; M. M. Elsahookie; A. M. A. Al-Jumaily
Abstract
This paper deals with the identification of the optimum cross and the cross next to it by applying two equations, GR (genotypic resultant) and AMMI. That was on three- way crosses of maize developed in the fall of 2009 on the fields of State Board of Agric. , in Abu- Ghraib. Ten three–way crosses were planted at ten sites (environments) in spring of 2011 to study their genotype × environment interaction. The equation of GR=(1-(S.D)⁄(X ̅i.)() (X ̅i.)⁄(X ̅..)) and the well-known AMMI equation were applied on data of crosses plant grain yields . The ANOVA explained that G×E interaction was significant. Both equations have identified that the cross G10 was the optimum one, and G8 was next. G10 had 157.2 g/plant while G8 had 143.8 g/plant. However, the GR equation was simple and efficient to identify these two crosses as compared to AMMI. Thus, it was recommended to apply GR in studies on G×E interaction for its simplicity and efficiency to identify the optimum cross and next to it as compared to the (ideal) which is theoretically of higher performance and 100% stability.
Keywords
Ideal cultivar; plant yield; phenotypic stability

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