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Variety x Environment Interactions in Cotton Variety Tests in the Delta of Mississippi¹

Eight cotton varieties were evaluated at three locations for a 3-year period to estimate the magnitude of variety x environment interactions. The presence of a substantial variety x location x year interaction for lint yield, lint percentage, and weight per boll indicated that varieties showed differential responses when grown in different environments. With the exception of fiber elongation and 50% span length, the second order interactions were larger than either of the first order interactions; however, with the exception of lint yield, the magnitude of these interactions was small in comparison with the varietal components, and thus may be considered relatively unimportant. The lack of a significant variety x location or a variety x year interaction for all characters measured, indicated that neither locations nor years had any consistent effects on differential variety responses.

Key Words: Variance components

² Plant Breeder, Delta Branch of Mississippi Agricultural Experiment Station; Research Geneticist, Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture; and Assistant Agronomist, Delta Branch of Mississippi Agricultural Experiment Station, respectively, Stoneville, Miss., 38776.

Received for publication March 1, 1969.