Stability of corn (Zea mays)-velvetleaf (Abutilon theophrasti) interference relationships

John L. Lindquist, David A. Mortensen, Sharon A. Clay, Richard Schmenk, James J. Kells, Kirk Howatt, Philip Westra

Research output: Contribution to journalArticlepeer-review

109 Scopus citations


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, respeetively. 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.

Original languageEnglish (US)
Pages (from-to)309-313
Number of pages5
JournalWeed Science
Issue number2
StatePublished - 1996

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Plant Science


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