January 2022 - 38

Table 2. Hollow heart incidence from different areas of the fields
irrigated with VRI systems. Numbers followed by different letters
are significantly different at p<0.05.
Hollow heart incidence
Area of the field
Nozzle control VRI
Dry
Average
Wet
8% A
13% A
15% A
Speed control VRI
3% b
5% ab
13% a
Table 3. Irrigation efficiency of the speed control VRI system in
different areas of the field. Numbers followed by different letters
mean significant difference at p<0.05.
Area of the field
Dry
Average
Wet
Irrigation efficiency
(lb of tubers/inch of irrigation water)
9 AB
8 B
12 A
incidence of hollow heart in tubers from
the wettest areas of both fields, and the
difference was significant under the
speed control system (Table 2).
During storage under 48°F, we
observed higher incidence of rotting
in tubers from the wettest areas of
both fields (Figure 3). It is thought that
the tubers grown in saturated soils
had enlarged lenticels on the surface,
which created perfect entry points for
pathogens in field and during storage.
In addition, we calculated irrigation
efficiency (IE) of the speed control
VRI system (numbers of the nozzle
control VRI were not available), and
it showed that there was a significant
improvement of IE in the wettest area
compared to the average area of the
field. IE in the driest area was slightly
higher than the average (Table 3).
For nitrogen status, using NDVI to
predict petiole nitrate-N generated
the best R2
results
for both potato
types, compared to whole leaf total N
and whole vine total N. For total yield
prediction, DT and RF were better than
SVM, and the results for 2019 were
better than 2018.
So far we have found that:
1) decision tree and random forest
36
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