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The Critical Period of Weed Control in Grain Corn (Zea mays)

Published online by Cambridge University Press:  12 June 2017

Michael R. Hall ,
Clarence J. Swanton  and
Glenn W. Anderson
Michael R. Hall
Affiliation:
Dep. Crop Sci., Univ. Guelph, Guelph, ON, Canada N1G 2W1
Clarence J. Swanton
Affiliation:
Dep. Crop Sci., Univ. Guelph, Guelph, ON, Canada N1G 2W1
Glenn W. Anderson
Affiliation:
Dep. Crop Sci., Univ. Guelph, Guelph, ON, Canada N1G 2W1
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Abstract

Field studies were conducted in southern Ontario to determine the critical period of weed control in grain corn and the influence of weed interference on corn leaf area. The Gompertz and logistic equations were fitted to data representing increasing durations of weed control and weed interference, respectively. The beginning of the critical period varied from the 3- to 14-leaf stages of corn development However, the end of the critical period was less variable and ended on average at the 14-leaf stage. Weed interference reduced corn leaf area by reducing the expanded leaf area of each individual leaf and accelerating senescence of lower leaves. In addition, weed interference up to the 14-leaf stage of corn development impeded leaf expansion and emergence in 1989.

Keywords

CornZea mays (L.)Weed interferencedensitybiomasscrop yield losscorn leaf areaGompertzlogistic
Type
Weed Biology and Ecology
Information
Weed Science , Volume 40 , Issue 3 , September 1992 , pp. 441 - 447
Copyright
Copyright © 1992 by the Weed Science Society of America 

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