Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 14:546-548 (1974)
© 1974 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Starch Content, Test Weight, and Other Quality Parameters of Corn Produced in Different Maturity Areas of Ontario1

Joe H. Hilliard and T. B. Daynard2

Industrial buyers have traditionally assumed that the quality of grain corn (Zea mays L.) from shorter growing-season areas of Ontario is inferior to that of grain produced in longer-season areas. To test this assumption, we collected grain corn samples in the fall of 1970 and 1971 from 26 country elevators located across the corn-growing region of the province. We evaluated the samples for test weight, 100-kernel weight, percent starch, and percent protein. Significant positive correlations were found between test weight and maturity (i.e., number of heat units available for corn production at elevator location) and between 100-kernel weight and test weight. Correlations of percent starch and percent protein with maturity were not significant. The results indicated that, except for test weight, length of growing season has no consistent effect on the grain quality parameters measured. We would argue that because of the lack of a relationship between test weight and either starch or protein content, lower test weight should not detract from the suitability of shorter-season corn for most industrial uses.

Key Words: Protein quantity • Starch measurement • Zea mays L.

1 Contribution from Department of Crop Science, University of Guelph, Guelph, Ontario, Canada. The reported research was funded by grants from the Canada Department of Agriculture, and the Ontario Ministry of Agriculture.

2 Senior Scientist, The Cambrian Engineering Group, Ltd., Mississauga, Ontario (former Research Scientist, University of Guelph) and Assistant Professor, University of Guelph, Guelph, Ontario.

Received for publication December 29, 1973.




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