Soil-Color-Based Management Zones
Grain yield for each treatment within each management
zone for the SCMZ technique is presented for all
site years in Fig. 2. For Site Year I, overall grain yield
was impacted across the field by hail damage incurred
during the late vegetative growth. From field observations,
the hail damage was most severe in the area of the
field corresponding to the high management zone. This
observation is reflected in the grain yield measured for
the high management zone, which was 0.4 to 1.1 Mg ha21lower than that of the medium management zone across
all N treatments. Despite the hail damage, the SCMZ
technique was able to differentiate grain yield between
low and medium management zones for all treatments
in Site Year I.
Grain yield was found to be significantly different between
management zones for Site Year II. Across management
zones, grain yield ranged from 6.9 to 12.8 Mg
ha21. The high zone had a significantly higher grain yield
than that of the medium zone across all N treatments.
Likewise, the medium zone had higher grain yields than
the low zone across all N treatments.