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Border Effects in Cotton Variety Tests¹

Synopsis: In 3-year dry land tests at 3 locations in Oklahoma, significant or highly significant differences in yield of 2 test varieties resulted from border effects in 4 of the 9 tests. Differences in yield of the 2 varieties averaged over all borders were highly significant in 5 of the 9 tests. No significant border x variety interaction indicated similar reaction of test varieties to borders. On the basis of these results, Oklahoma variety tests are planted with 4-row plots, the center 2 harvested for yield.

² Agronomist, O.A.E.S., and Agent, F.C.R.B., A.R.S. The assistance of E. S. Oswalt, J. D. Bilbro, and G. A. Niles in the collection of data, and of Franklin Graybill in analysis and interpretation of data, is gratefully acknowledged.

Received for publication November 5, 1955.