Show simple item record

dc.contributor.authorComstock, Jonathan P
dc.contributor.authorFerguson, Richard
dc.contributor.authorBailey, Scarlett
dc.contributor.authorBeem-Miller, Jeffery P
dc.contributor.authorSherpa, Sonam R
dc.contributor.authorLin, Feng
dc.contributor.authorLehmann, Johannes
dc.contributor.authorWolfe, David W
dc.description.abstractA carbonate (CO3) prediction model was developed for soils throughout the contiguous United States using mid-infrared (MIR) spectroscopy. Excellent performance was achieved over an extensive geographic and chemical diversity of soils. A single model for all soil types performed very well with a root mean square error of prediction (RMSEP) of 12.6 g kg-1 and was further improved if Histosols were excluded (RMSEP 11.1 g kg-1). Exclusion of Histosols was particularly beneficial for accurate prediction of CO3 values when the national model was applied to an independent regional dataset. Little advantage was found in further narrowing the taxonomic breadth of the calibration dataset, but higher precision could be obtained by running models for a restricted range of CO3. Ten absorbance peaks enabling CO3 prediction by mid-infrared (MIR) models were identified and evaluated for individual predictive power and the directness with which peak shape was translated into the loading vectors and cumulative loading function of a partial least squares (PLS) model. An absorbance peak centered at 1796 cm-1 was found to be the most informative with an RMSEP of 13.5 g kg-1 for carbonate prediction. This predictive power is attributed to the strength and sharpness of the peak, and an apparent minimal overlap with confounding co-occurring spectral features of other soil components. Soil CO3 is an excellent example of a soil parameter than can be predicted with great effectiveness and generality, and MIR models could replace direct laboratory measurement in many contexts. This eCommons item holds the datasets from this work.en_US
dc.description.sponsorshipThis project was supported in part by Agriculture and Food Research Initiative Competitive Grant no. 2011-67003-3025 from the USDA National Institute of Food and Agriculture.
dc.subjectsoil carbonateen_US
dc.subjectMIR spectra modelsen_US
dc.subjectKSSL dataen_US
dc.subjectsoil taxonomyen_US
dc.titleData from "Carbonate Determination by Mid-IR Spectroscopy with Regional and Continental Scale Models"en_US

Files in this item


This item appears in the following Collection(s)

  • Horticulture Research Data
    This collection holds research data and related products from the Horticulture Section of the Cornell School of Integrative Plant Science.

Show simple item record