Evaluating the Spectral Response and Yield of Soybean Following Exposure to Sublethal Rates of 2,4-D and Dicamba at Vegetative and Reproductive Growth Stages
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Oseland, Eric
[1
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Shannon, Kent
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Univ Missouri, Agr Syst Technol, Columbia, MO 65211 USAUniv Missouri, Div Plant Sci, Columbia, MO 65211 USA
Shannon, Kent
[2
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Zhou, Jianfeng
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Univ Missouri, Agr Syst Technol, Columbia, MO 65211 USAUniv Missouri, Div Plant Sci, Columbia, MO 65211 USA
Zhou, Jianfeng
[2
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Fritschi, Felix
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Univ Missouri, Div Plant Sci, Columbia, MO 65211 USAUniv Missouri, Div Plant Sci, Columbia, MO 65211 USA
Fritschi, Felix
[1
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Bish, Mandy D.
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Univ Missouri, Div Plant Sci, Columbia, MO 65211 USAUniv Missouri, Div Plant Sci, Columbia, MO 65211 USA
Bish, Mandy D.
[1
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Bradley, Kevin W.
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Univ Missouri, Div Plant Sci, Columbia, MO 65211 USAUniv Missouri, Div Plant Sci, Columbia, MO 65211 USA
Bradley, Kevin W.
[1
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[1] Univ Missouri, Div Plant Sci, Columbia, MO 65211 USA
[2] Univ Missouri, Agr Syst Technol, Columbia, MO 65211 USA
The commercialization of synthetic auxin-resistant crops and the commensurate increase in post-emergent auxin-mimic herbicide applications has resulted in millions of hectares of injury to sensitive soybeans in the United States since 2016. Visual yield loss estimations following auxin injury can be difficult. The goal of this research was to determine if spectral variations following auxin injury to soybean allow for more precise yield loss estimations. Identical field experiments were performed in 2018, 2019, and 2020 in Columbia, Missouri to compare the ability of established vegetative indices to differentiate between exposure levels of 2,4-D and dicamba in soybean and predict yield loss. Soybeans were planted at three timings for growth stage separation and were exposed to sublethal rates of 2,4-D and dicamba at the R2, R1, and V3 growth stages. A UAV-mounted multispectral sensor was flown over the trial 14 days after the herbicide treatments. The results of this research found that vegetative indices incorporating the red-edge wavelength were more consistent in estimating yield loss than indices comprised of only visible or NIR wavelengths. Yield loss estimations became difficult when soybean injury occurred during later reproductive stages when soybean biomass was increased. This research also determined that when injury occurs to soybean in vegetative growth stages late in the growing season there is a greater likelihood for yield loss to occur due to decreased time for recovery. The results of this research could provide direction for more objective and accurate evaluations of yield loss following synthetic auxin injury than what is currently available.
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Mississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762 USAMississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762 USA
Sperry, Benjamin P.
Scholtes, Alanna B.
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Mississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762 USAMississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762 USA
Scholtes, Alanna B.
Golus, Jeffrey A.
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Univ Nebraska Lincoln, West Cent Res & Extens Ctr, Dept Agron & Hort, North Platte, NE USAMississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762 USA
Golus, Jeffrey A.
Vieira, Bruno C.
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Univ Nebraska Lincoln, West Cent Res & Extens Ctr, Dept Agron & Hort, North Platte, NE USAMississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762 USA
Vieira, Bruno C.
Reynolds, Daniel B.
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Mississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762 USAMississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762 USA
Reynolds, Daniel B.
Kruger, Greg R.
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Univ Nebraska Lincoln, West Cent Res & Extens Ctr, Dept Agron & Hort, North Platte, NE USAMississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762 USA
Kruger, Greg R.
Irby, Jon Trenton
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Mississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762 USAMississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762 USA
Irby, Jon Trenton
Eubank, Thomas W.
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Corteva Agrisci, Wilmington, DE USAMississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762 USA
Eubank, Thomas W.
Barber, L. Thomas
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Univ Arkansas, Dept Crop Soil & Environm Sci, Lonoke, AR USAMississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762 USA
Barber, L. Thomas
Dodds, Darrin M.
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Mississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762 USAMississippi State Univ, Dept Plant & Soil Sci, Mississippi State, MS 39762 USA