United States
Department of
Agriculture
National
Agricultural
Statistics
Service
Statistical
Research
Division
NASS Staff Report
Number SRB-NERS-86·02
.
December 1986
Comparison of
Objective Yield
to 'Combine
Harvested Yield
in Soybeans
Robert J. Battaglia and
Ralph V. Matthews
COMPARISON OF OBJECTIVE YIELD TO COMBINE HARVESTED YIELD IN SOYBEANS
by Robert
J. Battaglia
and Ralph V. Matthews,
Research
and
Applications Division, National Agricultural Statistics Service, U.S.
Department of Agriculture, Washington, D.C.
20250, December 1986.
Staff Report No. SRB-NERS-86-02.
ABSTRACT
A comparison of objective yield and plot-combine yield was examined in
this report.
Objective yield harvest units (3-foot by I-row) were
laid out in seventy-two 16-foot by 4-row soybean plots.
Estimated
yields from the hand-harvested
OY units were compared with plot-
combine yields from the center 2 rows of the 16-foot plots.
Results
showed that OY units underestimated
plot-combine
yields by 2.87
bushels. The experiment will be repeated in 1986.
KEY WORDS: soybean objective yield, plot-combine yield, analysis of
variance
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This paper was prepared for limited distribution to
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the research community outside the U.S. Department of
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Agriculture.
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ACKNOWLEDGMENT
The authors gratefully thank Dr. Robert Leffel, Research Agronomist,
ARS, whose advice and and assistance made the project possible; Bessie
Johnson who typed the report and Ron Steele, Mickey Yost, Ron Fecso
and Barry Ford for their useful manuscript suggestions.
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CONTENTS
Page
SUMM.A.RY
•••....
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i i i
INTRODUCTION AND BACKGROUND
1
ANALYSIS
Analysis of Variance Model
• 3
.5
CONCLUSIONS AND RECOMMENDATIONS
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7
REFERENCES
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8
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SUMMARY
The purpos~ of this research was to compare soybe