COTTON YltELD
AND
gINNING STUDY
Gary N. Bovard
Stati
stical Research
Division
Economics
and Statistics
Service
U. S. Department
of Agriculture
Nove mber
1980
COTTON YIELD AND GINNING STUDY. By Gary N. Bovard; Economics and Statis-
tics Service; U.S. Department of Agriculture
ABSTRACT
This paper examines three components of the Cotton Objective Yield Survey --
the seed lint ratio, the harvested seed cotton estimate and the harvest loss
estimate.
Possible causes for differences between objective yield estimates
of seed cotton and gin reported seed cotton yields may be harvest loss
located in gin trash from stripper harvested fields and the time lag
between the final preharvest and the postharvest field measurements.
The
relationship between lint yield and seed cotton yield can be represented
by a ratio. Harvest loss directly outside field boundaries may approach
1.0 percent of biological yield in stripper harvested fields.
Keywords:
cotton, seed lint ratio, gin trash.
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This paper was prepared for limited distribution to :
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the research community
outside the U.S. Department
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of Agriculture.
The views expressed herein are not :
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necessarily those of ESS or USDA.
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ACKNOWLEDGEMENTS
Numerous present and past members of the researcll staff have contributed
to this study, but special recognition should go to Bill Iwig, Ben Klugh
and Jack Nealon for their study design and data collection efforts.
CONTENTS
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In tro due tion" .. ""
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1
Sampl e Des ign
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Data Analysis
Seed Lint Ratio
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Seed Cotton Estimates""".""
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Harves t Loss ....
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Evaluation of Modified Estimates •••••.•••..••••••.•.•.•••..•••.•••••
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St.IIIIDlary" •• " " " " •••
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