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Effects of Preplant and Postplant Rotary Hoe Use on Weed Control, Soybean Pod Position, and Soybean Yield

Published online by Cambridge University Press:  20 January 2017

George T. Place ,
S. Chris Reberg-Horton  and
Michael G. Burton
George T. Place
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695
S. Chris Reberg-Horton*
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695
Michael G. Burton
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695
*
Corresponding author's E-mail: [email protected]
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Abstract

Demand for organic food products has consistently increased for more than 20 yr. The largest obstacle to organic soybean production in the southeastern United States is weed management. Current organic soybean production relies on mechanical weed control, including multiple postplant rotary hoe uses. Although postplant rotary hoe use is effective at the weed germination stage, its efficacy is severely compromised by delays due to weather. Preplant rotary hoeing is also a practice that has been utilized for weed control but the effectiveness of this practice to reduce the need for multiple postplant rotary hoeing for organic soybean production in the southeastern United States has not been investigated. Preplant rotary hoe treatments included a weekly rotary hoeing 4 wk before planting, 2 wk before planting, and none. Postplant rotary hoe treatments consisted of zero, one, two, three, and four postplant rotary hoe uses. Weed control was increased with preplant rotary hoeing at Plymouth in 2006 and 2007 but this effect disappeared with the first postplant rotary hoeing. Multiple postplant rotary hoe uses decreased soybean plant populations, decreased soybean canopy height, lowered soybean pod position, and decreased soybean yield. Plant mapping revealed that the percentage of total nodes and pods below 30 cm was increased by increased frequency of postplant rotary hoe use.

Keywords

Soybean, Glycine max (L.) Merr.Organic weed managementorganic farmingstale seedbedmechanical weed control
Type
Weed Management
Information
Weed Science , Volume 57 , Issue 3 , June 2009 , pp. 290 - 295
Copyright
Copyright © Weed Science Society of America 

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