Medoid values of the 12 GIS variables for each of five clusters, i.e. landscape types.

Variables were derived from publicly available databases (e.g. SSURGO). Also shown are spatial characteristics of each cluster and sampled fields that were part of each cluster. Values were derived from Partitioning Around Medoids analysis on the 103 random points assigned to land in organic tomato production in Yolo County, California, USA, i.e. the landscape of study. Soil variables are from the 0–100 cm depth.a A method of soil rating that summarizes the land's potential utilization and productive capacity. Grade 1 (excellent): 100–80; Grade 2 (good): 79–60; Grade 3 (fair): 59–40; Grade 4 (poor): 39–20.b Number of crop rotation types in a 1-mile surrounding square, based on 2008 survey by Richter et al. (2009)c Typical crop grown, based on 2008 survey by Richter et al. (2009)d Agricultural region of Yolo County, as defined by Richter et al. (2009)e Number of ha represented by the cluster, based on the tesselation analysis of the land in organic tomato production.f Proportion of the total landscape area (i.e. land in organic tomato production in Yolo Co., California) represented by the clusterMedoid values of the 12 GIS variables for each of five clusters, i.e. landscape types.