1. Improving NUE Using Crop Sensing : “It Takes a Village”

2. Handheld Sensing: Does User Have An Effect? Handheld Sensing: Does User Have An Effect?

3. A Simple Test Two 30-ft row segments were measured by 4 different users Orientation: 1. E-W 2. N-S Both GreenSeeker (red) and Crop Circle ACS-210 sensors evaluated Replicated 5 times Corn was at ~ V-9 growth stage

4. All users were given the same user instructions: –Hold sensor between 20 and 24 inches above the crop canopy –Keep the sensor centered over the row as much as possible –Keep the sensor level as possible (by eye) –Walk about 1 to 2 miles/hr –Collect data between the flags A Simple Test

5. NDVI b d a c c aa b

6. NDVI sd a b b b b a b a

7. Number of Measurements a c a b c b a b

9. One user repeated the sensor measurements (Crop Circle only) walking in the opposite direction as the initial test. A Simplier Test

10. NDVI a a

11. Number of Measurements a b

12. Handheld Sensing: Does User Have An Effect? Handheld Sensing: Does User Have An Effect?

13. Newell R. Kitchen, Kenneth A. Sudduth, Scott Drummond USDA-ARS, Columbia, MO Peter Scharf, Harlan Palm, and Kent Shannon Univ. of MO, Columbia, MO