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Overview of GreenSeeker and Crop Circle Hand Held Active Sensors

Comparison of NDVI, Response Index, and CV, in Corn, Sorghum, and Wheat from GreenSeeker and Crop Circle Hand-Held Active Sensors Drew Tucker GRA Agronomy Department, Kansas State University. Overview of GreenSeeker and Crop Circle Hand Held Active Sensors.

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Overview of GreenSeeker and Crop Circle Hand Held Active Sensors

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  1. Comparison of NDVI, Response Index, and CV, in Corn, Sorghum, and Wheat from GreenSeeker and Crop Circle Hand-Held Active Sensors Drew Tucker GRA Agronomy Department, Kansas State University

  2. Overview of GreenSeeker and Crop Circle Hand Held Active Sensors • GreenSeeker sensor wavelengths are approximately 660 and 770 nm. • The field of view at 1 meter from the target is approximately 1 cm by 61 cm wide. • Crop Circle sensor wavelengths are approximately 550 and 880 nm. • The field of view at 1 meter from the target is approximately 11 cm by 54 cm wide.

  3. To see how NDVI, Response Index, and CV correlates in Corn, Sorghum, and Wheat between the GreenSeeker and Crop Circle hand held active sensors throughout the growing season. Research Objectives

  4. Materials and Methods • Several Nitrogen field experiments were conducted during the 2006-2008 growing seasons on Corn, Sorghum, and Wheat. • NDVI, Response Index, and CV from each treatment was collected and averaged. • The sensors always sensed the same sampling area at the same height above the target at close sensing time intervals to give as true as a comparison as possible.

  5. Comparison of GS NDVI and CC NDVI in Corn.

  6. Comparison of GS RI and CC RI in Corn.

  7. Comparison of GS CV and CC CV in Corn.

  8. Field of view CV readingsAvg. NDVISensor noise?

  9. CV in 1 m of rowCV per plot

  10. CV in 1 m of rowCV per plot

  11. Comparison of GS NDVI and CC NDVI in Sorghum.

  12. Comparison of GS RI and CC RI in Sorghum.

  13. Comparison of GS CV and CC CV in Sorghum.

  14. Comparison of GS NDVI and CC NDVI in Wheat.

  15. Comparison of GS RI and CC RI in Wheat.

  16. Comparison of GS CV and CC CV in Wheat.

  17. Conclusions • NDVI was very strong correlated in sorghum and wheat, while still maintaining a relationship in corn. • Response Index was very strongly correlated in sorghum and wheat, however, in corn this relationship was not very good. • CV correlations were very good in sorghum and corn, however, in wheat this relationship was not very good. • The GreenSeeker sensor seems to have a wider working range and more sensitivity in detecting nitrogen stress especially early in the growing season. • The Crop Circle sensor and the GreenSeeker sensor both seem to saturate at the same time. • Due to the observed differences, separate sensor recommendations need to be developed.

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