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Genotype Environment Interactions and the Identification of Adaptable Cultivars of Upland Rice (Oryza Sativa) in South-Western Nigeria

Published online by Cambridge University Press:  03 October 2008

J. B. Oyedokun
J. B. Oyedokun
Affiliation:
Institute of Agricultural Research and Training, University of Ife, PMB 5029, Ibadan, Nigeria
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Summary

Twenty improved upland rice cultivars were evaluated in yield trials at three locations for three successive years in south-western Nigeria. Highly significant genotype x environment interactions were observed, indicating that some cultivars yielded better in some locations than others. The use of regression analysis adequately identified the cultivars best suited to each environment. S2d values (measures of stability) for the cultivars ranged from 0.0007 to 0.2196, the cultivars with smaller values being more stable at the respective locations. The more adaptable cultivars have high mean yields and a deviation from regression as small as possible. The cultivar best adapted to good environments was code 3 (an improved selection from the cross Lac 23 x IR 528) with a yield of 3.36 t ha−1, while code 9 (a sister selection from the same cross) was best adapted to poor environments. Code 8 (a selection from the cross IR 154/O.S. 6 and 63–83) showed general adaptability. Once grain quality has been evaluated some of these cultivars might therefore replace code 18, the currently recommended upland rice cultivar, in the rain-forest zone.

Type
Research Article
Information
Experimental Agriculture , Volume 21 , Issue 1 , January 1985 , pp. 53 - 58
Copyright
Copyright © Cambridge University Press 1985

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References

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