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

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. Sugar beet top yield 2004. Y = -11402 + 20665 X r = 0.34*. Y = -11157 + 18705 X r = 0.62**.

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

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  1. 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

  2. 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**

  3. 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

  4. 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.

  5. Methods

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

  7. Correlations (r)

  8. Correlation between GS and CC r = 0.82

  9. Top DM and NDVI (GS) r = 0.63

  10. Top DM and NDVI (CC) r = 0.60

  11. TW site 2005

  12. BL site 2005

  13. 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.

  14. Questions????

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