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Published online 1 August 1957
Published in Agron J 49:444-449 (1957)
© 1957 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Estimates of Cost and Optimum Plot Size and Shape for Measuring Yield and Chemical Characters in Soybeans1

Charles R. Weber and Theodore W. Horner2

Sypnosis: Seed yield was 6 to 28 times more variable than chemical characters (oil, protein, iodine number). Use of incomplete block designs and other considerations justified long, narrow plots. Total cost (in hours) was 39.0% for obtaining yield and 61.0% for chemical attributes. Optimum plot size, apportioning cost among characters, was 3.2 times the basic unit ( 8 x 2 feet). Yield required 33, 50 and 700 times more replication than oil, protein and iodine number for comparable precision.

1 Joint contribution from the Iowa Agr. Exp. Sta., and Statistical Laboratory, Ames, Iowa, and the Crops Research Division, A.R.S., U.S.DA. U.S. Regional Soybean Laboratory publication No. 295. Journal paper No. 3139, Iowa Agr. Exp. Sta., Ames, Iowa. Project Nos. 1179 and 1285. This study is part of a M.S. thesis submitted by the senior author to the Graduate Faculty of the University of Illinois, June, 1941 and is published here with the permission of the Agronomy Department, University of Illinois. Grateful acknowledgment is made to the staff of the U.S. Regional Soybean Laboratory, Urbana, Ill., for the chemical determinations.

2 Associate Professor of Agronomy (Farm Crops), Iowa State College and Agronomist, Crops Research Division, A.R.S., U.S.D.A.; Assistant Professor of Statistics, Iowa , State College, respectively.

Received for publication February 8, 1956.


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H. Li and J. W. Burton
Selecting Increased Seed Density to Increase Indirectly Soybean Seed Protein Concentration
Crop Sci., March 1, 2002; 42(2): 393 - 398.
[Abstract] [Full Text] [PDF]


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Copyright © 1957 by the American Society of Agronomy.