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Variance statistics as a tool for envolving maize cultivar recommendations

By: Pali-Shikhulu, J | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): CIMMYT | Malaza, P.T [coaut.] | Mthethwa, M [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Addis Ababa (Ethiopia) CIMMYT|EARO : 1999Description: p. 82-85.ISBN: 92-9146-065-6.Subject(s): Africa | Breeding methods | High yielding varieties | Maize | Small farms | Stability | Statistical methods | Swaziland | CIMMYT | Zea mays AGROVOC | Genotypes AGROVOC | Hybrids AGROVOCDDC classification: 633.15 Summary: This paper is based on a study conducted to assess yield stability in a set of selected maize (Zea mays) hybrids. It is based on 17 maize hybrids evaluated in 12 environments during 1994/95 -1996/97 seasons. The target set of environments for this study are those ecological zones in Swaziland that receive reliable rainfall during the summer season that exceeds 750 mm in more than 80% of the years. The analysis revealed highly significant environment, genotype and genotype x environment (G x E) interaction effects. Stability indices (a2i and s2i) based on Shukla's method compromised yield for stability. Kang's rank-sums combining both grain yield and stability indices was superior to yield and stability indices. Their superiority is evidenced from the choice of genotypes that were derived from all maturity groups used in the study. The rank-sum approach sacrificed yield. However, for the small-scale farmer, the loss of yield advantage is commonly a less important consideration than stability.Collection: CIMMYT Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 633.15 EAS No. 6 (Browse shelf) 1 Available R649283
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This paper is based on a study conducted to assess yield stability in a set of selected maize (Zea mays) hybrids. It is based on 17 maize hybrids evaluated in 12 environments during 1994/95 -1996/97 seasons. The target set of environments for this study are those ecological zones in Swaziland that receive reliable rainfall during the summer season that exceeds 750 mm in more than 80% of the years. The analysis revealed highly significant environment, genotype and genotype x environment (G x E) interaction effects. Stability indices (a2i and s2i) based on Shukla's method compromised yield for stability. Kang's rank-sums combining both grain yield and stability indices was superior to yield and stability indices. Their superiority is evidenced from the choice of genotypes that were derived from all maturity groups used in the study. The rank-sum approach sacrificed yield. However, for the small-scale farmer, the loss of yield advantage is commonly a less important consideration than stability.

English

0103|AL-Maize Program|AGRIS 0102|AJ

CIMMYT Publications Collection

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Centro Internacional de Mejoramiento de Maíz y Trigo (CIMMYT) © Copyright 2015. Carretera México-Veracruz. Km. 45, El Batán, Texcoco, México, C.P. 56237.
Lunes –Viernes 9:00 am. 17:00 pm. Si tiene cualquier pregunta, contáctenos a CIMMYT-Knowledge-Center@cgiar.org