### Abstract

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 language | English (US) |
---|---|

Pages (from-to) | 195-200 |

Number of pages | 6 |

Journal | Weed Science |

Volume | 47 |

Issue number | 2 |

State | Published - Mar 1 1999 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Agronomy and Crop Science
- Plant Science

### Cite this

*Weed Science*,

*47*(2), 195-200.

}

*Weed Science*, vol. 47, no. 2, pp. 195-200.

**Stability of corn (Zea mays)-foxtail (Setaria spp.) interference relationships.** / Lindquist, John L.; Mortensen, David; Westra, Philip; Lambert, W. J.; Bauman, Thomas T.; Fausey, Jason C.; Kells, James J.; Langton, Steven J.; Harvey, R. Gordon; Bussler, Brett H.; Banken, Kevin; Clay, Sharon; Forcella, Frank.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Stability of corn (Zea mays)-foxtail (Setaria spp.) interference relationships

AU - Lindquist, John L.

AU - Mortensen, David

AU - Westra, Philip

AU - Lambert, W. J.

AU - Bauman, Thomas T.

AU - Fausey, Jason C.

AU - Kells, James J.

AU - Langton, Steven J.

AU - Harvey, R. Gordon

AU - Bussler, Brett H.

AU - Banken, Kevin

AU - Clay, Sharon

AU - Forcella, Frank

PY - 1999/3/1

Y1 - 1999/3/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0033009226&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033009226&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0033009226

VL - 47

SP - 195

EP - 200

JO - Weed Science

JF - Weed Science

SN - 0043-1745

IS - 2

ER -