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

  • John L. Lindquist (a1), David A. Mortensen (a1), Sharon A. Clay (a2), Richard Schmenk (a3), James J. Kells (a3), Kirk Howatt (a4) and Philip Westra (a4)...


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.



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Weed Science
  • ISSN: 0043-1745
  • EISSN: 1550-2759
  • URL: /core/journals/weed-science
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