Application of Machine Learning Methodologies for Predicting Corn Economic Optimal Nitrogen Rate

dc.contributor.author Qin, Zhisheng
dc.contributor.author Myers, D. Brenton
dc.contributor.author Sawyer, John
dc.contributor.author Ransom, Curtis
dc.contributor.author Kitchen, Newell
dc.contributor.author Liang, Sang-Zi
dc.contributor.author Camberato, James
dc.contributor.author Carter, Paul
dc.contributor.author Ferguson, Richard
dc.contributor.author Fernandez, Fabian
dc.contributor.author Franzen, David
dc.contributor.author Laboski, Carrie
dc.contributor.author Malone, Brad
dc.contributor.author Nafziger, Emerson
dc.contributor.author Sawyer, John
dc.contributor.author Shanahan, John
dc.contributor.department Agronomy
dc.date 2018-10-27T03:03:05.000
dc.date.accessioned 2020-06-29T23:05:57Z
dc.date.available 2020-06-29T23:05:57Z
dc.date.issued 2018-01-01
dc.description.abstract <p>Determination of in-season N requirement for corn (<em>Zea mays</em> L.) is challenging due to interactions of genotype, environment, and management. Machine learning (ML), with its predictive power to tackle complex systems, may solve this barrier in the development of locally based N recommendations. The objective of this study was to explore application of ML methodologies to predict economic optimum nitrogen rate (EONR) for corn using data from 47 experiments across the US Corn Belt. Two features, a water table adjusted available water capacity (AWC<sub>wt</sub>) and a ratio of in-season rainfall to AWC<sub>wt</sub> (RAWC<sub>wt</sub>), were created to capture the impact of soil hydrology on N dynamics. Four ML models—linear regression (LR), ridge regression (RR), least absolute shrinkage and selection operator (LASSO) regression, and gradient boost regression trees (GBRT)—were assessed and validated using “leave-one-location-out” (LOLO) and “leave-one-year-out” (LOYO) approaches. Generally, RR outperformed other models in predicting both at planting and split EONR times. Among the 47 tested sites, for 33 sites the predicted split EONR using RR fell within the 95% confidence interval, suggesting the chance of using the RR model to make an acceptable prediction of split EONR is ∼70%. When RR was used to test split EONR prediction with input weather features surrogated with 10 yr of historical weather data, the model demonstrated robustness (MAE, 33.6 kg ha<sup>–1</sup>; <em>R</em><sup>2</sup> = 0.46). Incorporating mechanistically derived hydrological features significantly enhanced the ability of the ML procedures to model EONR. Improvement in estimating in-season soil hydrological status seems essential for success in modeling N demand.</p>
dc.description.comments <p>This article is published as Li, Chao, Dermot J. Hayes, and Keri L. Jacobs. "Biomass for Bioenergy: Optimal Collection Mechanisms and Pricing when Feedstock Supply Does Not Equal Availability." <em>Energy Economics</em> 110 (2018): 1-12. doi: <a href="http://dx.doi.org/10.2134/agronj2018.03.0222" target="_blank">10.2134/agronj2018.03.0222</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/531/
dc.identifier.articleid 1580
dc.identifier.contextkey 13153735
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/531
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4896
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/531/2018_Sawyer_ApplicationMachine.pdf|||Sat Jan 15 00:51:05 UTC 2022
dc.source.uri 10.2134/agronj2018.03.0222
dc.subject.disciplines Agricultural Economics
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Hydrology
dc.subject.disciplines Plant Breeding and Genetics
dc.subject.disciplines Soil Science
dc.title Application of Machine Learning Methodologies for Predicting Corn Economic Optimal Nitrogen Rate
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 17ce8a78-56b3-47be-abcb-b22968be40f2
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
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