Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 11:45-48 (1971)
© 1971 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Duration of the Grain Filling Period and Its Relation to Grain Yield in Corn, Zea mays L.1

T. B. Daynard, J. W. Tanner and W. G. Duncan2

A Significant linear relationship was found among several corn (Zea mays L.) hybrids grown in 1966 and 1967 at Guelph, Ontario at several planting densities, between grain yield and effective filling period duration. Effective filling period duration (EFPD) is defined as final grain yield divided by the average rate of grain dry weight accumulation during the linear period of grain formation, and hence, is a relative measure of the length of the grain filling period. In each year yield differences among hybrids were more closely related to EFPD differences than to differences in the rate of ear dry weight accumulation. EFPD was unaffected by planting density. Results suggest that significant potential exists in corn for higher grain yields through a genetic extension of the length of the grain filling period.

Key Words: Grain maturity • Effective filling period duration

1 Contribution of the Crop Science Department, University of Guelph, Guelph, Ontario, Canada, and the Agronomy Department, University of Kentucky, Lexington, Kentucky, 40506. Financial support from the National Research Council of Canada and the Ontario Department of Agriculture and Food is gratefully acknowledged.

2 Assistant Professor and Professor, University of Guelph, and Professor, University of Kentucky

Received for publication April 17, 1970.


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