Received for publication November 25, 1978. Reference to a specific brand or firm name does not constitute endorsement by the U. S. Department of Agriculture over others of a similar nature not mentioned. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.
The authors thank Mr. E. James Koch, Biometrician, and Dr. Roger Smith, Data Systems Application Division, for the statistical analyses, and George A. Brown for technical assistance.
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