Scaling behaviour of crop yield at each of the selected sites: Melfort (A), Swift Current (B) and Lacombe (C).
RM, ECD, CAR refer to rural municipality, ecodistrict, and census agricultural region, respectively. The logarithm values of yield data are plotted against the logarithm of the average harvested areas. The scaling factor α
-η corresponds to the absolute slope of the straight line. For a given site, yield data at RM, ECD and CAR is that of the corresponding spatial unit in which it falls. Data were not detrended. We assumed that the same trend exist throughout the spatial scales for a given site. All the slopes were significant at the confidence level 0.05.