Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 6:227-231 (1966)
© 1966 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Estimating Harvest Date of Corn in the Field1

J. L. Schmidt and Arnel R. Hallauer2

Moisture data for 12 years from the period 1940 to 1963 were summarized to determine the relation between kernel moisture and time. The rate of kernel moisture reduction was determined for five arbitrary moisture phases and used to predict when specified moisture levels would be attained from pollination date. Correlation studies were made between rate of kernel moisture reduction and four weather factors (air temperature, saturation deficit, wet bulb depression, and relative humidity).

The average daily rates of kernel moisture reduction varied considerably from year to year within the five phases of corn growth. Above 30% kernel moisture content the rate of moisture reduction was significantly related to the temperature of the air. Below 30% kernel moisture the reduction rate was significantly related to saturation deficit, wet bulb depression, and relative humidity of the air.

A curve, along with a 95% confidence band, was constructed to show the average number of days for corn to go from pollination to a given kernel moisture.

1 Journal Paper No. J-5243 of the Iowa Agricultural and Home Economics Experiment Station, Ames, Iowa. Project No. 1296 (USDA cooperating).

2 Statistician, Harvesting and Farm Processing Research Branch, Agricultural Engineering Research Division, and Research Geneticist, Crops Research Division, ARS, USDA, Ames, Iowa.

The authors wish to acknowledge the assistance of O. Kempthorne, Professor of Statistics, and G. R. Jobnson, Research Associate in Statistics, Iowa State University, in working these data.

Received for publication December 22, 1965.




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