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Increased weed emergence and seed bank depletion by soil disturbance in a no-tillage system

Published online by Cambridge University Press:  12 June 2017

Dawit Mulugeta  and
David E. Stoltenberg
Dawit Mulugeta
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI 53706
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Abstract

The influence of secondary soil disturbance on the emergence pattern and seed bank depletion of an annual weed community in a long-term, no-tillage corn cropping system was determined in 1992 and 1993. As a component of this research, the seed bank was characterized prior to implementation of soil disturbance treatments. The seed bank was initially composed of common lambsquarters, redroot pigweed, and giant foxtail, with approximately 55, 36, and 8% of the total viable seeds, respectively. The remaining 1% was comprised of five other species in 1992 and eight in 1993. The spatial distribution of viable seeds of each species, except common lambsquarters and redroot pigweed, was described by a negative binomial distribution. Three dispersion indices indicated that seeds of individual and total weed species were aggregated and that the level of aggregation of viable seeds of a species was associated with seed density; at lower seed densities, the level of aggregation was greater. Soil disturbance increased common lambsquarters emergence 6-fold in 1992 relative to nondisturbed soil, but did not influence emergence in 1993. Rainfall was about 50% less in 1993. In contrast, soil disturbance increased giant foxtail and redroot pigweed emergence approximately 6- and 3-fold in 1992 and 1993, respectively. Seedling emergence associated with soil disturbance, relative to nondisturbed soil, increased seed bank depletion of common lambsquarters 16-fold in 1992, and giant foxtail and redroot pigweed and average of 6- and 3-fold in 1992 and 1993, respectively. These results indicated that soil disturbance increased seedling emergence and seed bank depletion of the predominant species in the weed community of a long-term, no-tillage system, but that this response was dependent on rainfall for common lambsquarters.

Keywords

Common lambsquarters, Chenopodium album L. CHEALgiant foxtail, Setaria faberi Herrm. SETFAredroot pigweed, Amaranthus retroflexus L. AMAREcorn, Zea mays L. ‘Pioneer 3417’Dispersion indicesgrowing degree daysnegative binomialrainfallseed distributionAMARECHEALSETFA

Information

Type
Weed Biology and Ecology
Information
Weed Science , Volume 45 , Issue 2 , April 1997 , pp. 234 - 241
Copyright
Copyright © 1997 by the Weed Science Society of America 

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