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Weed population responses to weed control practices. I. Seed bank, weed populations, and crop yields

Published online by Cambridge University Press:  12 June 2017

Douglas D. Buhler
Douglas D. Buhler*
Affiliation:
U.S. Department of Agriculture, Agricultural Research Service, National Soil Tilth Laboratory, Ames, IA 50011; buhler@nstl.gov
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Abstract

Weed control practices affected the weed seed content of the soil, weed seedling populations, and corn and soybean yields in two 4-yr field experiments. When the initial weed seed density was high, giant foxtail seed numbers in soil declined rapidly under weed-free conditions. Changes in seed densities when initial densities were low varied over years. Mechanical and chemical control treatments had variable effects on weed seed numbers over the course of the experiment. Weed seed numbers and weed densities were sometimes greater if herbicides were banded, but crop yields were similar to full-rate herbicides in both experiments in all years. When the initial density was low, giant foxtail seed numbers in soil increased over the course of the experiment regardless of the weed control treatment. Seed densities of broadleaf species decreased under the same conditions. Also, when initial weed densities were low, weed control and crop yields were less sensitive to weed control practices than at high weed densities. Weather factors that influenced treatment efficacy had a major affect on weed populations and crop yield responses to the weed control treatments over years. The interactions of weed control practices, weed populations, and crop yields were complex. Initial weed density and species composition interacted with weed control treatments and weather patterns to generate the results observed.

Keywords

Giant foxtail, Setaria faberi Herrm. SETFAcorn, Zea mays L.soybean, Glycine max (L.) Merr.Population shiftsweed biologyweed seed bank
Type
Weed Biology and Ecology
Information
Weed Science , Volume 47 , Issue 4 , August 1999 , pp. 416 - 422
Copyright
Copyright © 1999 by the Weed Science Society of America 

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