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Field Plot Technique With Hybrid Corn Under Alabama Conditions¹

Accepted for publication October 17, 1956.

Synopsis: Based on uniformity trial data from double-cross corn in Alabama, plots 1 to 3 rows wide and 10 to 15 hills long (1 plant per hill) were the most efficient, disregarding relative costs. A plot 2 rows wide and 10 to 15 hills long was considered the optimum site for general use. A basic unit of more than 5 plants may be advantageous in future experiments with corn uniformity data. There was only a small decrease in L.S.D. by increasing the replications from 5 to 6. The small gain in precision did not justify the use of the simple lattice instead of the randomized blocks design with 16, 25, or 36 entries.

² Formerly graduate assistant, Alabama Polytechnic Institute, now Associate Professor of Plant Breeding, University of Georgia; formerly Professor of Agronomy, Alabama Polytechnic Institute, now Head of the Department of Agronomy, University of Georgia; formerly Director of Statistical Laboratory, Alabama Polytechnic Institute, now Director of Statistical Laboratory, Iowa State College, respectively. The writers wish to express their thanks to Dr. H. L. Thomas, Associate Professor of Agronomy and Plant Genetics, University of Minnesota, and to Dr. F. S. McCain, Associate Plant Breeder, Alabama Polytechnic Institute, for their suggestions concerning the manuscript.

Received for publication June 14, 1954. Accepted for publication October 17, 1956.