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1 July 2009 A 2-Year Small Grain Interval Reduces Need for Herbicides in No-Till Soybean
Randy L. Anderson
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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.

Nomenclature: Common lambsquarters, Chenopodium album L.; green foxtail, Setaria viridis (L.) Beauv.; yellow foxtail, Setaria glauca (L.) Beauv.; corn, Zea mays L.; oat, Avena sativa L.; soybean, Glycine max (L.) Merr.; wheat, Triticum aestivum L.

Randy L. Anderson "A 2-Year Small Grain Interval Reduces Need for Herbicides in No-Till Soybean," Weed Technology 23(3), 398-403, (1 July 2009).
Received: 5 March 2009; Accepted: 1 May 2009; Published: 1 July 2009
Alternative weed control
cool-season crops
cover crops
Cultural weed management
residue management
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