Models predicting Avena fatua biomass and growth rate.

Akaike information criterion (AIC) scores for mixed-effects models of Avena fatua biomass and relative growth rate, where k is the number of parameters predicted by intercept only, nitrogen fertilization rate (N), competition from Triticum aestivum (T. aestivum biomass), A. fatua population, and their interactions. Bold values indicate the best-fit models with the lowest AIC scores. Δ(AIC) is the change in AIC with respect to the best candidate model and wAIC is the AIC weight. N rate, T. aestivum biomass, and A. fatua population were fixed effects and greenhouse was a random effect included in every model. n = 8 for each N, T. aestivum competition, and A. fatua combination.