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Use of Planting Dates in the Preliminary Evaluation of New Cowpea Cultivars

Published online by Cambridge University Press:  03 October 2008

M. A. B. Fakorede ,
A. E. Akingbohungbe  and
B. A. Ogunbodede
M. A. B. Fakorede
Affiliation:
Department of Plant Science, University of Ife, Ile-Ife, Nigeria
A. E. Akingbohungbe
Affiliation:
Department of Plant Science, University of Ife, Ile-Ife, Nigeria
B. A. Ogunbodede
Affiliation:
Department of Plant Science, University of Ife, Ile-Ife, Nigeria
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Summary

Four cultivars of cowpeas (Vigna unguiculata L. Walp.) were grown in 15 sets of conditions (environments) i.e. in several monthly plantings in each of three years. Data for seed yield were analysed to investigate the effectiveness of using planting dates in preliminary yield trials of new cultivars. Extremely significant environment mean squares and wide ranges of environmental indices (− 13.3 to 23.5) and seed yield (11.4 to 48.2 g plant−1) indicated real differences among environments. Stability analyses of the cultivar × environment interactions suggest that, where limited funds preclude the use of several locations, monthly plantings for two or more years could be used effectively in the preliminary evaluation of cultivars without losing much information on their relative ranking.

Type
Research Article
Information
Experimental Agriculture , Volume 19 , Issue 2 , April 1983 , pp. 163 - 168
Copyright
Copyright © Cambridge University Press 1983

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References

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