“…There are cases where they have been adapted to account for spatial heterogeneity in the horizontal dimensions in specific situations, such as investigating row canopy structures (Schnieders, 1999). The conductance model takes a different and simpler approach to modelling competition than the more complex ecophysiological models mentioned above, and ignores the vertical distribution of canopy foliage, focussing instead on the lateral spread (Benjamin and Park, 2007;Aikman and Scaife, 1993;Aikman and Benjamin, 1994;Benjamin and Aikman, 1995;Benjamin, 1999;Park et al, 2001). Alternatively, point-based models can be used to represent spatially-heterogeneous fields by running separate simulations for each distinct region with the field, such as patches with different weed densities, and then averaging the results weighted by the relative area of each distinct region.…”