Nitrogen Management and its Influence on N Losses to Surface ...

Nitrogen Management and its Influence on N Losses to Surface ...

Effect of corn hybrids/traits on inseason optical sensing and NUE: 2006 experiences Jeff Vetsch and Gyles Randall Univ. of Minnesota Southern Research and Outreach Center Waseca, MN 01/17/20 NUE Workshop, Monmouth IL August 9 10, 2007 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. 01/17/20 Ken Ostlie 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. 01/17/20 Corn following soybean results Significant differences for grain, stover, and silage yield for: PP N vs. split applied N Timing by hybrid family 0 of 3 200 Control Preplant Split 2 of 3 Trait

0 of 3 Interactions 5 of 12 Corn grain yield, bu/A Hybrid family 150 100 50 0 A 01/17/20 B Hybrid family C 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

1.4 YGCB YG Plus Hybrid family Trait 0 of 5 Interactions 7 of 20 1.3 Grain N concentration, % 3 of 5 N timing by hybrid trait 1.2 1.1 1.0 0.9 Control 01/17/20 Preplant

N Timing Split 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 YGCB YG Plus Hybrid family Trait 2 of 6 Interactions 45 Plant heights, inch 6 of 6 Hybrid trait effects on plant height 50

40 35 4 of 24 30 V8 01/17/20 V10 Corn growth stage 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 Hybrid family by trait for NDVI 0.84 0 of 8 YGCB YG Plus Hybrid family

0.82 Trait 3 of 8 Interactions 13 of 32 01/17/20 NDVI 8 of 8 0.80 0.78 0.76 A B Hybrid family C Corn following corn results Significant differences for grain, stover, and silage yield for: PP N vs. split applied 0 of 3

7.0 YGCB YG Plus Hybrid family Trait 3 of 3 Interactions 5 of 12 6.5 Silage yield, T DM/A 2 of 3 Hybrid family by trait for silage yield 6.0 5.5 5.0 4.5 01/17/20

A B Hybrid family C 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 5 200 Hybrid family Trait 4 of 5 Interactions 5 of 20 180 Silage N uptake, lb N/A 4 of 5 N timing by hybrid trait YGCB

YG Plus 160 140 120 100 80 60 Control 01/17/20 Preplant N Timing Split 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 0.76 Hybrid family Trait 5 of 6

YGCB YG Plus 0.75 NDVI at V10 6 of 6 Hybrid family by trait for NDVI 0.77 0.74 0.73 Interactions 0.72 3 of 24 0.71 0.70 01/17/20 A B

Hybrid family C Apparent N Recovery N Mgmt. None Preplant Split Hybrid Family A B C Trait YGCB YG Plus 01/17/20 Soybean Corn ----%---38 44 59 57 37 40 45 63

51 62 40 42 55 61 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 01/17/20 Acknowledgement The authors are most grateful to the Monsanto Corporation for financial assistance and thoughtful guidance during this research project. 01/17/20

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