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Estimating giant foxtail cohort productivity in soybean based on weed density, leaf area, or volume

Published online by Cambridge University Press:  20 January 2017

Shawn P. Conley ,
Larry K. Binning ,
Chris M. Boerboom  and
David E. Stoltenberg
Larry K. Binning
Affiliation:
University of Wisconsin, Department of Horticulture, Madison, WI 53706
Chris M. Boerboom
Affiliation:
University of Wisconsin, Department of Agronomy, Madison, WI 53706
David E. Stoltenberg
Affiliation:
University of Wisconsin, Department of Horticulture, Madison, WI 53706
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Abstract

Understanding weed–crop interactions is critical in predicting crop yield loss, but it is also important to understand how these interactions affect weed productivity. Therefore, research was conducted to characterize the weed relative leaf area and weed relative volume of several giant foxtail cohorts in soybean, and to assess weed density and cohort emergence time, weed relative leaf area, and weed relative volume as predictors of giant foxtail shoot biomass and fecundity. Giant foxtail cohorts emerged at VE (emergence), VC (cotyledon), V1 (first node), and V3 (third node) soybean growth stages and were thinned to densities of 0, 4, 16, 36, and 64 plants m−2. Based on weed density and cohort emergence time, the maximum shoot biomass per square meter or the maximum fecundity per square meter differed between years. In contrast, shoot biomass or fecundity per plant, as weed density approached zero, and the rate at which shoot biomass or fecundity decreased exponentially, as time increased, were similar between years. Based on the weed relative leaf area, the cohort effect on giant foxtail shoot biomass differed between years, whereas the cohort effect on giant foxtail fecundity was similar between years. Maximum giant foxtail shoot biomass per square meter or fecundity per square meter differed between years when estimated from weed relative leaf area. Based on the weed relative volume, the cohort effect on giant foxtail shoot biomass per square meter or fecundity per square meter was similar between years, as was the maximum giant foxtail shoot biomass per square meter or fecundity per square meter. The temporal stability of weed relative volume, used to describe giant foxtail shoot biomass or fecundity, may aid in improving bioeconomic weed management models.

Keywords

Giant foxtail, Setaria faberi Herrm. SETFAsoybean, Glycine max (L.) Merr. ‘Asgrow AG2101’Seed productiontime of emergence
Type
Research Article
Information
Weed Science , Volume 50 , Issue 1 , February 2002 , pp. 72 - 78
Copyright
Copyright © Weed Science Society of America 

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