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Stability of Corn (Zea mays)-Velvetleaf (Abutilon theophrasti) Interference Relationships

Published online by Cambridge University Press:  12 June 2017

John L. Lindquist ,
David A. Mortensen ,
Sharon A. Clay ,
Richard Schmenk ,
James J. Kells ,
Kirk Howatt  and
Philip Westra
John L. Lindquist
Affiliation:
Dep. Agron., Univ. Nebraska, Lincoln, NE 68583
David A. Mortensen
Affiliation:
Dep. Agron., Univ. Nebraska, Lincoln, NE 68583
Sharon A. Clay
Affiliation:
Dep. Agron., South Dakota State Univ., Brookings, SD 57007
Richard Schmenk
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48824
James J. Kells
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48824
Kirk Howatt
Affiliation:
Dep. Plant Path. and Weed Sci., Colorado State Univ., Fort Collins, CO 80523
Philip Westra
Affiliation:
Dep. Plant Path. and Weed Sci., Colorado State Univ., Fort Collins, CO 80523
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Abstract

The crop-weed interference relationship is a critical component of bioeconomic weed management models. Multi-year field experiments were conducted at five locations to determine the stability of corn-velvetleaf interference relationships across years and locations. Two coefficients (I and A) of a hyperbolic equation were estimated for each data set using nonlinear regression procedures. The I and A coefficients represent percent corn yield loss as velvetleaf density approaches zero, and maximum percent corn yield loss, respectively. The coefficient I was stable across years at two locations, but varied across years at one location. The coefficient A did not vary across years within locations. Both coefficients, however, varied among locations. Results do not support the use of common coefficient estimates for all locations within a region.

Keywords

Velvetleaf, Abutilon theophrasti Medik. ♯ ABUTHcorn, Zea mays L.Competitionbioeconomic modeleconomic thresholdintegrated weed management
Type
Weed Biology and Ecology
Information
Weed Science , Volume 44 , Issue 2 , June 1996 , pp. 309 - 313
Copyright
Copyright © 1996 by the Weed Science Society of America 

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