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Published in Crop Sci 9:135-140 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Classification of Environments to Control Genotype by Environment Interactions with an Application to Cotton1

H. A. Abou-El-Fittouh, J. O. Rawlings and P. A. Miller2

Cluster analysis as a tool for classifying locations in order to minimize the within-cluster genotype by location interactions was discussed and applied to the data for lint yield per hectare in upland cotton (Gossypium hirsutum L.) obtained from the Regional Cotton Variety Tests for years 1960–1964. The distance coefficient, which was more efficient as a measure of similarity than the product-moment correlation coefficient in preliminary analyses, was used to study the zoning of the cotton belt. Some modifications in the currently recognized zones of adaptation for cotton were suggested.

Key Words: Distance coefficient • Product-moment correlation coefficient • Upland cotton • Gossypium hirsutum L. • Cluster analyses

1 Paper number 2561 of the Journal Series of the North Carolina State University Agricultural Experiment Station, Raleigh, N. C. 27607. This investigation was supported in part by Public Health Service Research Grant No. GM 11546 from the Division of General Medical Sciences and by the National Institutes of Health Grant No. FR-00011. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree.

2 Former graduate student, Department of Experimental Statistics (now Statistician, Ministry of Agriculture, Giza, UAR); Professor of Experimental Statistics; and Professor of Crop Science, North Carolina State University, respectively.

Received for publication February 9, 1968.


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