Active-Optical Reflectance Sensing Evaluated for Red and Red-Edge Waveband Sensitivity

dc.contributor.author Bean, Gregory
dc.contributor.author Kitchen, Newell
dc.contributor.author Sawyer, John
dc.contributor.author Camberato, James
dc.contributor.author Ferguson, Richard
dc.contributor.author Fernández, Fabián
dc.contributor.author Franzen, David
dc.contributor.author Laboski, Carrie
dc.contributor.author Nafziger, Emerson
dc.contributor.author Sawyer, John
dc.contributor.author Scharf, Peter
dc.contributor.author Schepers, James
dc.contributor.author Shanahan, John
dc.contributor.department Agronomy
dc.date 2018-06-12T16:35:27.000
dc.date.accessioned 2020-06-29T23:02:31Z
dc.date.available 2020-06-29T23:02:31Z
dc.date.embargo 2018-06-11
dc.date.issued 2017-01-01
dc.description.abstract <p>Uncertainty exists with corn (Zea mays L.) N management due to year-to-year variation in crop N need, soil N supply, and N loss from leaching, volatilization, and denitrification. Active-optical reflectance sensing (AORS) has proven effective in some fields for generating N fertilizer recommendations that improve N use efficiency. However, various sensors utilize different wavebands of light to calculate N fertilizer recommendations making it difficult to know which waveband is most sensitive to plant health. The objective of this research was to evaluate across the US Midwest Corn Belt the performance and sensitivity of the red (R) and red-edge (RE) wavebands. Forty-nine N response trials were conducted across eight states and three growing seasons. Reflectance measurements were collected and topdress N rates (40 to 240 lbs N ac-1 on 40 lbs ac-1 increments) applied at approximately V9 corn development stage. Both R and RE wavebands were compared to the at-planting N fertilizer rate, V5 soil nitrate-N, and end-of-season calculated relative yield. In every comparison the RE waveband demonstrated higher coefficient of determination values over the R waveband. These findings suggest the RE waveband is most sensitive to variations in N management and would work best for in-season AORS management over a geographically-diverse soil and weather region.</p>
dc.description.comments <p>This proceeding was published as Bean, G.M., N.R. Kitchen, J.J. Camberato, P.R. Carter, R.B. Ferguson, F.G. Fernandez, D.W. Franzen, C.A.M. Laboski, E.D. Nafziger, J.E. Sawyer, P.C. Scharf, J.S. Schepers, and J. Shanahan. 2017. Active-optical reflectance sensing evaluated for red and red-edge waveband sensitivity. p. 121-131. <em>In</em> Proc. Forty-Seventh North Central Extension-Industry Soil Fertility Conf., Des Moines, IA. 15-16 Nov. 2017. </p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_conf/75/
dc.identifier.articleid 1074
dc.identifier.contextkey 12293521
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_conf/75
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4418
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_conf/75/2017_Sawyer_ActiveOptical.pdf|||Sat Jan 15 01:49:28 UTC 2022
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Soil Science
dc.title Active-Optical Reflectance Sensing Evaluated for Red and Red-Edge Waveband Sensitivity
dc.type article
dc.type.genre conference
dspace.entity.type Publication
relation.isAuthorOfPublication 17ce8a78-56b3-47be-abcb-b22968be40f2
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
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