Reviewed by: Douglas Buhler, USDA/ARS National Soil Tilth Laboratory, Ames, Iowa; Robert Hartzler, Iowa State University Extension; Michael Horak, Kansas State University, Manhattan, Kansas; and Loyd Wax, University of Illinois, Champaign-Urbana, Illinois.
Photos by: Donald Pratt or Donald Pratt and Anna Gardner
Online version by: Brent Pringnitz., Iowa State University Extension.
Printing and distribution costs for this publication have been paid by the Iowa Soybean Promotion Board using soybean checkoff dollars.
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Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Stanley R. Johnson, director, Cooperative Extension Service, Iowa State University of Science and Technology, Ames, Iowa.