1. Effect of corn hybrids/traits on in-season optical sensing and NUE: 2006 experiences
Jeff Vetsch and Gyles Randall
Univ. of Minnesota
Southern Research and Outreach Center
Waseca, MN
NUE Workshop, Monmouth IL
August 9 – 10, 2007
12/10/2018

2. Situation
Hybrid traits like YieldGard Corn Borer™, YieldGard Rootworm™ and YieldGard Plus™) provide protection against yield robbing pests in corn, but little is known about the effects these traits have on optical sensing, N uptake, and NUE in corn.
Ken Ostlie
12/10/2018

3. Materials and Methods Cropping systems (two sites)
Corn following corn and corn following soybean
Three factor factorial design
N management treatments
Control, preplant incorporated urea, split applied (PP+V6)
Corn hybrids
Three hybrid families
Traits
YieldGard Corn Borer and YieldGard Plus
Measurements
Yield, N conc. and uptake, NUE, NDVI, SPAD, plant heights, whole plant at V10, multi spectral, and more.
12/10/2018

4. Corn following soybean results
Significant differences for grain, stover, and silage yield for:
PP N vs. split applied
0 of 3
Hybrid family
2 of 3
Trait
Interactions
5 of 12
12/10/2018

5. Corn following soybean results
Significant differences for grain and stover N conc., N uptake, and apparent N recovery for:
PP N vs. split applied
0 of 5
Hybrid family
3 of 5
Trait
Interactions
7 of 20
12/10/2018

6. Corn following soybean results
Significant differences in corn plant height and NDVI (GreenSeeker) at V8 and V10, and SPAD meter at V10 and VT for:
PP N vs. split applied
0 of 6
Hybrid family
6 of 6
Trait
2 of 6
Interactions
4 of 24
12/10/2018

7. Corn following soybean results
Significant differences in multi spectral data (NIR, Red, Green, NDVI, GNDVI, RVI, GRVI, and GVI) on July 13 (VT) for:
PP N vs. split applied
0 of 8
Hybrid family
8 of 8
Trait
3 of 8
Interactions
13 of 32
12/10/2018

8. Corn following corn results
Significant differences for grain, stover, and silage yield for:
PP N vs. split applied
0 of 3
Hybrid family
2 of 3
Trait
3 of 3
Interactions
5 of 12
12/10/2018

9. Corn following corn results
Significant differences for grain and stover N conc., N uptake, and apparent N recovery for:
PP N vs. split applied
0 of 5
Hybrid family
4 of 5
Trait
Interactions
5 of 20
12/10/2018

10. Corn following corn results
Significant differences in corn plant height and NDVI (GreenSeeker) at V8 and V10, and SPAD meter at V10 and VT for:
PP N vs. split applied
1 of 6
Hybrid family
6 of 6
Trait
5 of 6
Interactions
3 of 24
12/10/2018

11. Apparent N Recovery Soybean Corn N Mgmt. - - - - % - - - - None
Preplant 38 59
Split 44 57
Hybrid Family A 37 63 B 40 51 C 45 62
Trait
YGCB 55
YG Plus 42 61
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12. What does it all mean? FIRST YEAR RESULTS
Hybrids can respond differently to N management practices
Preliminary implications for optical sensing and variable N application
Be careful on fields that contain refuges even if hybrid is in the same family
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13. Acknowledgement
The authors are most grateful to the Monsanto Corporation for financial assistance and thoughtful guidance during this research project.
12/10/2018