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A 2-Year Small Grain Interval Reduces Need for Herbicides in No-Till Soybean

Published online by Cambridge University Press:  20 January 2017

Randy L. Anderson
Randy L. Anderson*
Affiliation:
U.S. Department of Agriculture—Agricultural Research Service, 2923 Medary Avenue, Brookings, SD 57006
*
Corresponding author's E-mail: [email protected].
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Abstract

This study measured weed interference in soybean and corn as affected by residue management tactics following a sequence of oat and winter wheat. Residue management tactics compared were conventional tillage, no-till, and no-till plus cover crops. Treatments were split into weed-free and weed-infested conditions; prominent weeds were green and yellow foxtail and common lambsquarters. Grain yield of soybean did not differ between weed-free and weed-infested conditions with no-till, whereas weeds reduced yield 25% in the tilled system. Corn responded inconsistently to treatments, with more than 40% yield loss due to weed interference in 1 yr with all treatments. Cover crops did not improve weed management compared with no-till in either crop. Seedling emergence of the weed community differed between tillage and no-till; density of weed seedlings was fivefold higher with tillage, whereas seedling emergence was delayed in no-till. The initial flush of seedlings occurred 2 to 3 wk later in no-till compared with the tilled system. Designing rotations to include cool-season crops in a no-till system may eliminate the need for herbicides in soybean to manage weeds.

Keywords

Common lambsquarters, Chenopodium album L.green foxtail, Setaria viridis (L.) Beauvyellow foxtail, Setaria glauca (L.) Beauvcorn, Zea mays L.oat, Avena sativa L.soybean, Glycine max (L.) Merrwheat, Triticum aestivum L.Alternative weed controlcool-season cropscorncover cropscultural weed managementno-tillresidue management
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 23 , Issue 3 , September 2009 , pp. 398 - 403
Copyright
Copyright © Weed Science Society of America 

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