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The Critical Period of Weed Control in Soybean [Glycine max (L.) Merr.]

Published online by Cambridge University Press:  12 June 2017

Rene C. Van Acker ,
Clarence J. Swanton  and
Stephan F. Weise
Rene C. Van Acker
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
Stephan F. Weise
Affiliation:
Dep. Crop Sci., Univ. Guelph, Guelph, ON, Canada N1G 2W1
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Abstract

Field studies were conducted at three locations over 2 yr in southern Ontario to determine the critical period of weed control in soybean. This period generally consisted of two discrete periods, a critical weed-free period and a critical time of weed removal. The critical weed-free period was relatively short in duration and consistent across locations and years. A period of weed control lasting up to the fourth node growth stage (V4), approximately 30 days after emergence (DAE), was adequate to prevent a yield loss of more than 2.5%. The critical time of weed removal was variable across locations and years and ranged, for example, from the second node growth stage (V2) to the beginning pod growth stage (R3), approximately 9 to 38 DAE, at a 2.5% yield loss level. A phenologically based period of most rapid yield loss due to weed interference occurred from beginning bloom stage (R1) to beginning seed stage (R5). The short and consistent critical weed-free period indicates the duration of residual herbicide control necessary in soybean and supports use of nonresidual, postemergence herbicides and mechanical weed control.

Keywords

Soybean, Glycine max (L.) Merr.Weed interferencedensitybiomasscrop yield lossintegrated weed management
Type
Weed Biology and Ecology
Information
Weed Science , Volume 41 , Issue 2 , June 1993 , pp. 194 - 200
Copyright
Copyright © 1993 by the Weed Science Society of America 

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