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Published in Crop Sci 12:485-486 (1972)
© 1972 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Calculation of the Rate and Duration of Grain Filling in Corn (Zea mays L.)1

D. R. Johnson and J. W. Tanner2

Grain yield in corn (Zea mays L.) is a function of the rate and duration of dry matter accumulation in the grain. We developed a technique for calculating these two components, based upon a regression analysis of yield over time. At least 90% of the grain accumulated linearly beginning 2 1/2 weeks after silking. The duration of the actual grain-filling period can be calculated from the final yield plus two or three sampling dates between 3 and 6 weeks after silking.

Key Words: Hilar layer • Dry matter accumulation • Physiological maturity

1 Contribution from the Department of Crop Science, University of Guelph, Guelph, Ontario, Canada. The financial assistance of the National Research Council of Canada and the Ontario Department of Agriculture and Food is gratefully acknowledged.

2 Former graduate assistant (Presently, Assistant Professor of Agronomy, University of Missouri, Columbia, Mo. 65201) and Professor of Crop Science, University of Guelph, respectively.

Received for publication January 7, 1972.


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