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Organic Amendment and Tillage Effects on Vegetable Field Weed Emergence and Seedbanks

Published online by Cambridge University Press:  20 January 2017

Steven A. Fennimore  and
Louise E. Jackson
Steven A. Fennimore*
Affiliation:
Department of Vegetable Crops and Weed Science, University of California–Davis, Davis, CA 95616
Louise E. Jackson
Affiliation:
Department of Vegetable Crops and Weed Science, University of California–Davis, Davis, CA 95616
*
Corresponding author's E-mail: safennimore@ucdavis.edu
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Abstract

Evaluations of the effects of minimum tillage vs. conventional tillage and the effects of organic amendments (cover crops and compost) vs. no organic amendments were conducted in a California vegetable field. Weed densities were monitored, and soil samples were taken to measure the effects of the treatments on weed seedbanks and microbial biomass over a 24-mo period. Reduced tillage increased the density of shepherd's-purse in the upper soil layer (0 to 15 cm) of the soil seedbank compared with conventional tillage. Evidence is presented that suggests relationships between organic amendments, weed population reductions, and increases in soil microbial biomass: (1) shepherd's-purse emergence and seedbank densities were lower in the organic amendment plots, (2) microbial biomass was nearly always higher in the organic amendment plots, and (3) significant negative correlations between microbial biomass and burning nettle and shepherd's-purse emergence densities were found. These results suggest that organic matter addition may lead to reduced weed emergence.

Keywords

Burning nettle, Urtica urens L. #3 URTURshepherd's-purse, Capsella bursa-pastoris L. Medik. # CAPBPAlternative weed managementcompostcover cropmicrobial biomass carbonsoil amendmentsCAPBPURTUR
Type
Research
Information
Weed Technology , Volume 17 , Issue 1 , March 2003 , pp. 42 - 50
Copyright
Copyright © Weed Science Society of America 

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