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Edge Effects and Interactions with Environment in Cocoa

Published online by Cambridge University Press:  03 October 2008

K. J. Martin  and
G. Lockwood
K. J. Martin
Affiliation:
East Malling Research Station, Maidstone, Kent
G. Lockwood
Affiliation:
Cocoa Research Institute, PO Box 8, Tafo-Akim, Ghana
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Summary

In trials of seedling cocoa in Ghana, biases in the estimates of yield and tree size arising on the perimeters of experiments and on the interfaces of unguarded plots were strongly correlated, characteristic of progenies and stable across environments, but were inconsistent for black pod losses. No variate showed progeny × site interactions, but those of Caribbean yield data were interpreted by principal components analysis. The results show that 25-tree plots may be used for initial tests of new varieties and, as long as the environmental variation does not exceed that of the Ghanaian trials, at single sites.

Type
Research Article
Information
Experimental Agriculture , Volume 15 , Issue 3 , July 1979 , pp. 225 - 239
Copyright
Copyright © Cambridge University Press 1979

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References

REFERENCES

Cruickshank, A. M. & Murray, D. B. (1967). Rep. Cacao Res., Trinidad, 1966, 23.Google Scholar
Freeman, G. H. (1973). Heredity 31, 339.CrossRefGoogle Scholar
Freeman, G. H. & Dowker, B. D. (1973). Heredity 30, 97.CrossRefGoogle Scholar
Glendinning, D. R. (1964a). Rep. Cocoa Res. Inst. Ghana, 1962–1963, 46.Google Scholar
Glendinning, D. R. (1964b). Rep. Cocoa Res. Inst. Ghana, 1962–1963, 48.Google Scholar
Glendinning, D. R. & Vernon, A. J. (1965). J. hort. Sci. 40, 317.CrossRefGoogle Scholar
Jolly, A. L. & de Verteuil, L. L. (1960). Proc. VIII Inter-Am. Cacao Conf., Trinidad & Tobago, 1960, 390.Google Scholar
Lockwood, G. (1976a). Rep. Cocoa Res. Inst. Ghana, 1973–1974, 170.Google Scholar
Lockwood, G. (1976b). Euphytica 25, 647.CrossRefGoogle Scholar
Lockwood, G. & Martin, K. J. (1976). J. hort. Sci. 51, 353.CrossRefGoogle Scholar
Mandel, J. (1969). J. Res. natn. Bur. Stand. 73B, 309.CrossRefGoogle Scholar