Forecasting Corn Ear Weight Using Surface Area and Volume Variables: A Final Report

Fatu Wesley

No 323936, NASS Research Reports from United States Department of Agriculture, National Agricultural Statistics Service

Abstract: The 1988 Corn Ear Weight Study continued to analyze the forecast performance of models estimated using surface area and volume variables to predict final corn ear weight. The initial study used data collected in Michigan in 1986 and 1987. The 1988 study was expanded to Missouri to evaluate the performance of the surface area and volume models in a corn environment that is more drought prone than Michigan. Two models based on diameter measurements were compared to models estimated using the operational procedures from the Corn Objective Yield Survey. The 1988 Results show that the research models have mean square errors that are 40 to 57 percent lower than models estimated using the operational procedure. These results support the findings of the earlier study which indicate that the research models have a superior performance in both normal and drought years. Incorporation of a surface area or volume ear weight estimator should improve the new Corn Objective Yield Models.

Keywords: Crop Production/Industries; Research Methods/Statistical Methods (search for similar items in EconPapers)
Pages: 35
Date: 1990-12
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Persistent link: https://EconPapers.repec.org/RePEc:ags:unasrr:323936

DOI: 10.22004/ag.econ.323936

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