Effects of initial seed-bank density on weed seedling emergence during the transition to an organic feed-grain crop rotation

Richard G. Smith, Randa Jabbour, Andrew G. Hulting, Mary Ellen Barbercheck, David Mortensen

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The transition period to certified organic production can present a significant weed management challenge for growers. Organic certification requires that prohibited fertilizers and pesticides must not have been used for 36 mo before harvest of the first organic crop. Understanding how organic management practices and initial weed seed-bank densities affect weed population dynamics during the transition period may improve weed management efficacy and adoption of organic practices. We examined how tillage systems (full or reduced) and cover crop species planted during the first transition year (rye or a mixture of timothy and red clover) affect the seedling densities of three common annual weed species, common lambsquarters, velvetleaf, and foxtail spp., during the 3-yr transition period. Weed seeds were applied in a one-time pulse at the beginning of the study at three densities, low, medium, and high (60, 460, and 2,100 seeds m-2, respectively), and cumulative seedling densities of each species were assessed annually. Treatment factors had variable and species-specific effects on weed seedling densities. In general, the full-tillage system, with an initial cover crop of timothy and red clover, resulted in the lowest density of weed seedlings following seed-bank augmentation. There was little consistent association between the initial densities of applied weed seeds in the weed seed bank at the start of the transition and weed seedling densities at the end of the transition period. This suggests that when multiple crop and weed cultural management practices are employed during the organic transition period, initial failures in weed management may not necessarily lead to persistent and intractable annual weed species management problems following organic certification. Nomenclature: Common lambsquarters, Chenopodium album L. CHEAL; giant foxtail, Setaria faberi Herrm. SETFA; velvetleaf, Abutilon theophrasti Medik. ABUTH; yellow foxtail, Setaria glauca (L.) Beauv. SETLU; red clover, Trifolium pretense L.; rye, Secale cereal L.; timothy, Phleum pratense L.

Original languageEnglish (US)
Pages (from-to)533-540
Number of pages8
JournalWeed Science
Volume57
Issue number5
DOIs
StatePublished - Sep 1 2009

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feed grains
buried seeds
seedling emergence
grain crops
weeds
Trifolium pratense
Abutilon theophrasti
Chenopodium album
organic certification
Setaria pumila subsp. pumila
seedlings
weed control
annual weeds
cover crops
rye
tillage
seeds
Setaria faberi
Secale
Phleum pratense

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Plant Science

Cite this

Smith, Richard G. ; Jabbour, Randa ; Hulting, Andrew G. ; Barbercheck, Mary Ellen ; Mortensen, David. / Effects of initial seed-bank density on weed seedling emergence during the transition to an organic feed-grain crop rotation. In: Weed Science. 2009 ; Vol. 57, No. 5. pp. 533-540.
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Effects of initial seed-bank density on weed seedling emergence during the transition to an organic feed-grain crop rotation. / Smith, Richard G.; Jabbour, Randa; Hulting, Andrew G.; Barbercheck, Mary Ellen; Mortensen, David.

In: Weed Science, Vol. 57, No. 5, 01.09.2009, p. 533-540.

Research output: Contribution to journalArticle

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