Stability of Corn (Zea mays)-Velvetleaf (Abutilon theophrasti) Interference Relationships
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.
DOI of Published Version
Lindquist, John L.; Mortensen, David A.; Clay, Sharon; Schmenk, Richard; Kells, James J.; Howatt, Kirk; and Westra, Philip, "Stability of Corn (Zea mays)-Velvetleaf (Abutilon theophrasti) Interference Relationships" (1996). Agronomy, Horticulture and Plant Science Faculty Publications. 242.