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Crop Sequence and No-Till Reduce Seedling Emergence of Common Sunflower (Helianthus annuus) in Following Years

Published online by Cambridge University Press:  20 January 2017

Randy L. Anderson
Randy L. Anderson*
Affiliation:
USDA-ARS, 2923 Medary Avenue, Brookings, SD 57006
*
Corresponding author's E-mail: [email protected]
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Abstract

Weed management is evolving to include cultural tactics that reduce weed populations. This study near Brookings, SD, evaluated the effect of crop sequence and tillage on seedling emergence of common sunflower across years. In the third and fourth years of the study, seedling density was sevenfold greater after 2 yr of soybean with tillage compared with a 2-yr sequence of canola and winter wheat with no-till. Apparently, canola and winter wheat enhanced the natural decline of common sunflower seed density in soil, leading to fewer seedlings in following years. In the first year of the study, tillage increased seedling emergence of common sunflower compared with no-till; seedlings rarely emerged in canola or winter wheat. Most seedlings of common sunflower emerged in May, with more than 90% of seedlings emerging between May 7 and June 4. Cool-season crops grown with no-till may affect weed seed survival in soil in the western Corn Belt.

Keywords

Common sunflower, Helianthus annuus L. HELANcanola, Brassica napus L.soybean, Glycine max (L.) Merrwinter wheat, Triticum aestivum L.Crop diversityrotation designweed seed survival
Type
Research
Information
Weed Technology , Volume 21 , Issue 2 , June 2007 , pp. 355 - 358
Copyright
Copyright © Weed Science Society of America 

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