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A Comparison of Economic and Economic Optimum Thresholds for Two Annual Weeds in Soybeans

Published online by Cambridge University Press:  12 June 2017

Troy A. Bauer  and
David A. Mortensen
Troy A. Bauer
Affiliation:
Univ. Nebraska, Lincoln, NE 68583-0915
David A. Mortensen
Affiliation:
Univ. Nebraska, Lincoln, NE 68583-0915
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Abstract

Long term weed management programs for annual weeds should take into account seed production as well as yield losses from weeds. In this research economic optimum thresholds, determined with a simulation model, were compared to the economic thresholds derived from field studies with common sunflower and velvetleaf in soybean. An economic optimum threshold model, including a biological submodel and a submodel evaluating the financial benefit from controlling each weed species in soybean, was constructed to estimate the biological events and processes and economic costs of each weed. Long-term weed management programs were simulated in continuous soybean over a 15-yr period. The model optimized a POST treatment of bentazon by computing costs associated with weed interference and changes in estimated seedbank size. The economic optimum threshold populations were estimated to be 0.3 to 0.4 velvetleaf plants per 10 m2 and 0.4 common sunflower plants per 10 m2. The economic thresholds calculated to be 2.6 velvetleaf plants per 10 m2 and 1.5 common sunflower plants per 10 m2. The economic optimum threshold was calculated to be 7.5-fold and 3.6-fold lower than the economic thresholds for velvetleaf and common sunflower, respectively. The larger ratio for velvetleaf reflected the large quantity and longevity of seeds produced. The smaller ratio for common sunflower reflected the shorter persistence of the seeds and higher seed predation rates.

Keywords

Bentazon, 3-(1-methylethyl)-(1H-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide, velvetleaf, Abutilon theophrasti Medic. ♯ ABUTH, common sunflower, Helianthus annuus L. ♯ HELAN, soybean, Glycine max (L.) Merr.Economic thresholdweed interferencebentazonAbutilon theophrastiGlycine maxHelianthus annuusABUTHHELAN
Type
Symposium
Information
Weed Technology , Volume 6 , Issue 1 , March 1992 , pp. 228 - 235
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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