For Site Year II, grain yield differences between zones
did not follow the expected pattern. Within treatments,
our results indicate that the grain yield does differ
among zones delineated using the YBMZ technique;
however, the grain yield did not follow a logical trend as
designated by the productivity potential of the zones.
Across treatments, the medium zone was significantly
different from the high zone. Average grain yield in the
low zone was higher than grain yield observed in the
medium zones for the recommended and half recommended
N rate treatments (Fig. 3).Grain yields for Site Year III increased with the productivity
potential of the management zones for therecommended N treatment only (Fig. 3). Results of the
t-test indicate that the low and high zones had significantly
different grain yield (P # 0.05) for the recommended
N treatment only. In contrast, the low and
high zones were statistically equivalent for the half
recommended and control treatments.
Based on these results, the YBMZ technique did not
consistently differentiate productivity potential of the
management zones. This finding could be because (i) the
YBMZ technique is not characterizing all of the spatial
variability in the yield-limiting factors that affect overall
productivity, (ii) some of the spatial variability is lost in
the smoothing step during the management zone delineation
process, or (iii) a combination of the two
For Site Year II, grain yield differences between zonesdid not follow the expected pattern. Within treatments,our results indicate that the grain yield does differamong zones delineated using the YBMZ technique;however, the grain yield did not follow a logical trend asdesignated by the productivity potential of the zones.Across treatments, the medium zone was significantlydifferent from the high zone. Average grain yield in thelow zone was higher than grain yield observed in themedium zones for the recommended and half recommendedN rate treatments (Fig. 3).Grain yields for Site Year III increased with the productivitypotential of the management zones for therecommended N treatment only (Fig. 3). Results of thet-test indicate that the low and high zones had significantlydifferent grain yield (P # 0.05) for the recommendedN treatment only. In contrast, the low andhigh zones were statistically equivalent for the halfrecommended and control treatments.Based on these results, the YBMZ technique did notconsistently differentiate productivity potential of themanagement zones. This finding could be because (i) theYBMZ technique is not characterizing all of the spatialvariability in the yield-limiting factors that affect overallproductivity, (ii) some of the spatial variability is lost inthe smoothing step during the management zone delineationprocess, or (iii) a combination of the two
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