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dc.contributor.authorMetzger, Konrad
dc.contributor.authorZhang, Chaosheng
dc.contributor.authorWard, Mark
dc.contributor.authorDaly, Karen
dc.date.accessioned2021-02-16T17:05:01Z
dc.date.available2021-02-16T17:05:01Z
dc.date.issued2020-04
dc.identifier.citationMetzger, K, Zhang, C, Ward, M., Daly, K. Mid-infrared spectroscopy as an alternative to laboratory extraction for the determination of lime requirement in tillage soils, Geoderma, 2020, 364, 114171. DOI: https://doi.org/10.1016/j.geoderma.2020.114171en_US
dc.identifier.urihttp://hdl.handle.net/11019/2375
dc.descriptionpeer-revieweden_US
dc.description.abstractLime is a crucial soil conditioner to bring agricultural soils to optimum pH values for nutrient availability. Lime recommendations are typically determined in laboratory extractions, the most common being the “Shoemaker- McLean and Pratt” (SMP) buffer method, that requires carcinogenic reagents soon to be abolished under the EU legislation. As an alternative to wet chemistry, mid-infrared (MIR) spectroscopy has shown to be a cost-and time effective method at predicting soil properties. The capability and feasibility of diffuse reflectance infrared spectroscopy (DRIFTS) to predict lime requirement (LR) in tillage fields is examined. Samples from 41 cereal tillage fields (n = 655) are used to build a calibration for DRIFTS using partial least squares regression (PLSR). The samples were split into calibration set (31 fields, n=495) and validation set (10 fields, n= 160). After preprocessing with trim, smoothing and standard normal variate, a calibration model using 6 latent variables, provided R2 of 0.89 and root mean square error of cross-validation (RMSECV) of 1.56 t/ha. Prediction of all fields from the validation set resulted in R2 of 0.76 and root mean square error of prediction (RMSEP) of 1.68 t/ ha. The predictions of the single fields ranged from R2 values of 0.41 to 0.72, RMSEP of 0.48 to 4.2 t/ha and ratios of performance to inter-quartile distance (RPIQ) of 0.45 to 3.56. It was shown that the signals of soil constituents having an influence on the LR were picked up in the spectra and were identified in the loading weights of the PLSR. While the error is too high to predict the variability of LR within the field, MIR prediction using field averages provided a viable alternative to current laboratory methods for blanket spreading of lime on tillage fields.en_US
dc.description.sponsorshipTeagasc
dc.language.isoenen_US
dc.publisherElsevier BVen_US
dc.relation.ispartofseriesGeoderma;364
dc.rights© 2020 The Authors. Published by Elsevier B.V.
dc.rightsAttribution-NonCommercial-ShareAlike 4.0 International*
dc.rights.urihttps://www.elsevier.com/tdm/userlicense/1.0/
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/*
dc.subjectSoil spectroscopyen_US
dc.subjectLime requirementen_US
dc.subjectSMP bufferen_US
dc.subjectMIR DRIFTSen_US
dc.subjectChemometricsen_US
dc.titleMid-infrared spectroscopy as an alternative to laboratory extraction for the determination of lime requirement in tillage soilsen_US
dc.typeArticleen_US
dc.identifier.doihttps://doi.org/10.1016/j.geoderma.2020.114171
dc.contributor.sponsorTeagasc Walsh Fellowship Programmeen_US
dc.contributor.sponsorDepartment for Agriculture Food and the Marineen_US
dc.contributor.sponsorGrantNumberRMIS 6837en_US
dc.contributor.sponsorGrantNumber15/ICTAGRI 2en_US
dc.source.volume364
dc.source.beginpage114171
dc.source.journaltitleGeoderma


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