Stability of corn (Zea mays)-foxtail (Setaria spp.) interference relationships

John L. Lindquist, David A. Mortensen, Philip Westra, W. J. Lambert, Thomas T. Bauman, Jason C. Fausey, James J. Kells, Steven J. Langton, R. Gordon Harvey, Brett H. Bussler, Kevin Banken, Sharon Clay, Frank Forcella

Research output: Contribution to journalArticlepeer-review

63 Scopus citations


Variation in interference relationships have been shown for a number of crop-weed associations and may have an important effect on the implementation of decision support systems for weed management. Multiyear field experiments were conducted at eight locations to determine the stability of corn-foxtail interference relationships across years and locations. Two coefficients (I and A) of a rectangular hyperbola equation were estimated for each data set using nonlinear regression procedures. The I and A coefficients represent percent corn yield loss as foxtail density approaches zero and maximum percent corn yield loss, respectively. The coefficient I was stable across years at two locations and varied across years at four locations. Maximum yield loss (A) varied between years at one location. Both coefficients varied among locations. Although 3 to 4 foxtail plants m-1 row was a conservative estimate of the single-year economic threshold (T(c)) of foxtail density, variation in I and A resulted in a large variation in T(c). Therefore, the utility of using common coefficient estimates to predict future crop yield loss from foxtail interference between years or among locations within a region is limited.

Original languageEnglish (US)
Pages (from-to)195-200
Number of pages6
JournalWeed Science
Issue number2
StatePublished - 1999

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Plant Science


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