The Comparison of Red Greenseeker and Crop Circle in a Sugar Beet Canopy

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The Comparison of Red Greenseeker and Crop Circle
in a Sugar Beet Canopy

• John A. Lamb
• University of Minnesota
• and
• Mark W. Bredehoeft
• Southern Minnesota Beet Sugar Cooperative

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Sugar beet top yield 2004
Y -11402 20665 X r 0.34
Y -11157 18705 X r 0.62
Y -13397 19142 X r 0.40
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TW Clara City 0 N NDVI 0.66 C.V. 10
TW Clara City 130 N NDVI 0.84 C.V. 2
July 13, 2005
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Objectives

• Determine if sensors can predict sugar beet
  canopy near time of harvest.
• Compare the red greenseeker and crop circle
  sensors for sugar beet canopy.

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Methods
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Methods

• 3 locations with small plots
• 3 varieties
• 5 to 6 N rates
• Harvest sugar beet tops and determine dry matter
  for each plot.

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Correlations (r)
DM G7/13 G7/28 G8/9 G9/15 G9/27 C9/15 C9/27
DM 0.45 0.37 0.64 0.65 0.64 0.60 0.51
G7/13 0.91 0.56 0.23 0.10 0.49 0.08
G7/28 0.44 0.19 -0.03 0.51 0.01
G8/9 0.67 0.67 0.65 0.63
G9/15 0.92 0.82 0.83
G9/27 0.88 0.90
C9/15 0.71
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Correlation between GS and CC
r 0.82
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Top DM and NDVI (GS)
r 0.63
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Top DM and NDVI (CC)
r 0.60
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TW site 2005
Variety DM (lb/A) NDVI (GS) NDVI (CC)
1 3767 0.79 0.68
2 3892 0.80 0.68
3 4047 0.81 0.69
N rate (lb/A)
0 3340 0.79 0.66
90 3737 0.80 0.68
110 3836 0.80 0.69
130 4450 0.82 0.70
150 4147 0.80 0.68
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BL site 2005
Variety DM (lb/A) NDVI (GS) NDVI (CC)
1 3711 0.81 0.68
2 3370 0.79 0.65
3 3779 0.83 0.69
N rate (lb/A)
0 3048 0.80 0.67
70 3127 0.80 0.67
90 3556 0.81 0.67
110 3921 0.82 0.68
130 3931 0.82 0.68
150 4095 0.82 0.69
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Conclusions

• There is a relationship between Top DM and NDVI
  as measured by sensors.
• The sensors, while not producing the same NDVI
  numbers, work similarly in predicting Top DM.

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Questions????
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