Top view of coring locations with four maize plants. Yellow circles represent core locations, identified with respect to the focal plant (green asterisk). Blue circles represent possible alternate placements of coring locations by rotation and/or reflection. The red polygons are the Voronoi map showing the area estimated by each coring location. Row spacing for both species was 76 cm, in row spacing for bean was 10 cm and 23 cm for maize. Between row bean coring locations (1, 3, 4) were oriented identically but in row positions (2, 5, 6) were compressed due to tighter in row planting density of bean.