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Soybean Seeding Rate Effects on Weed Management

Published online by Cambridge University Press:  20 January 2017

Guillermo D. Arce ,
Palle Pedersen  and
Robert G. Hartzler
Guillermo D. Arce
Affiliation:
Department of Agronomy, Iowa State University, Ames, IA 50010
Palle Pedersen
Affiliation:
Department of Agronomy, Iowa State University, Ames, IA 50010
Robert G. Hartzler*
Affiliation:
Department of Agronomy, Iowa State University, Ames, IA 50010
*
Corresponding author's E-mail: hartzler@iastate.edu.
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Abstract

Studies were conducted in 2005 and 2006 at three Iowa locations to determine the effect of soybean seeding rate and glyphosate application timing on weed management and grain yields in glyphosate-resistant soybean. End-of-season weed populations were affected by soybean seeding rate at only one location, with higher weed densities present in the lowest seeding rate when glyphosate was applied at the V2 soybean growth stage. Although weed populations were not consistently affected by soybean population, weed biomass present at soybean harvest was inversely related to soybean population. At the location with the highest weed populations, no single glyphosate application provided yields equivalent to the weed-free control. At the other locations, glyphosate application timing did not affect soybean yield. Lower soybean yields occurred with 240,000 seed/ha compared with 420,000 seed/ha at all locations and with 300,000 seed/ha at two locations.

Keywords

Glyphosatesoybean, Glycine max L.Plant populationglyphosate-resistant soybeanherbicide-tolerant crops
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 23 , Issue 1 , March 2009 , pp. 17 - 22
Copyright
Copyright © Weed Science Society of America 

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