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Effects of Corn Hybrids on In-Season Optical Sensing and Nitrogen Use Efficiency: 2006 Experiences

This study explores the impact of YieldGard traits on optical sensing, nitrogen uptake, and NUE in corn crops. Results from corn following corn and corn following soybean scenarios are analyzed to understand the effects of hybrid traits on various growth parameters.

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Effects of Corn Hybrids on In-Season Optical Sensing and Nitrogen Use Efficiency: 2006 Experiences

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  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

  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

  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.

  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 • 0 of 3 • Interactions • 5 of 12

  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 • 0 of 5 • Interactions • 7 of 20

  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

  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

  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

  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 • 4 of 5 • Interactions • 5 of 20

  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

  11. Apparent N Recovery

  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

  13. Acknowledgement • The authors are most grateful to the Monsanto Corporation for financial assistance and thoughtful guidance during this research project.

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