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Combined use of hyperspectral VNIR reflectance spectroscopy and kriging to predict soil variables spatially

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Abstract

Hyperspectral visible near infrared reflectance spectroscopy (VNIRRS) and geostatistical methods are considered for precision soil mapping. This study evaluated whether VNIR or geostatistics, or their combined use, could provide efficient approaches for assessing the soil spatially and associated reductions in sample size using soil samples from a 32 ha area (800 × 400 m) in northern Turkey. Soil variables considered were CaCO3, organic matter, clay, sand and silt contents, pH, electrical conductivity, cation exchange capacity (CEC) and exchangeable cations (Ca, Mg, Na and K). Cross-validation was used to compare the two approaches using all grid data (n = 512), systematic selections of 13, 25 and 50% of the data and random selections of 13 and 25% for calibration; the remaining data were used for validation. Partial least squares regression (PLSR) analysis was used for calibrating soil properties from first derivative VNIR reflectance spectra (VNIRRS), whereas ordinary-, co- and regression-kriging were used for spatial prediction. The VNIRRS-PLSR method provided better prediction results than ordinary kriging for soil organic matter, clay and sand contents, (R 2 values of 0.56–0.73, 0.79–0.85, 0.65–0.79, respectively) and smaller root mean squared errors of prediction (values of 2.7–4.1, 37.4–43, 46.9–61, respectively). The EC, pH, Na, K and silt content were predicted poorly by both approaches because either the variables showed little variation or the data were not spatially correlated. Overall, the prediction accuracy of VNIRRS-PLSR was not affected by sample size as much as it was for ordinary kriging. Cokriging (COK) and regression kriging (RK) were applied to a combination of values predicted by VNIR reflectance spectroscopy and measured in the laboratory to improve the accuracy of prediction of the soil properties. The results showed that both COK and RK with VNIRRS estimates improved the predictions of soil variables compared to VNIRRS and OK. The combined use of VNIRRS and multivariate geostatistics results in better spatial prediction of soil properties and enables a reduction in sampling and laboratory analyses.

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Acknowledgements

This study was sponsored in part by USDA-CSREES Special Grant on Computational Agriculture and Scientific Research Administration of Gaziosmanpasa University, Tokat, Turkey.

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Authors and Affiliations

  1. Department of Soil Science, Agriculture Faculty, Harran University, Sanliurfa, 63300, Turkey

    A. Volkan Bilgili

  2. Department of Soil Science, Agriculture Faculty, Gaziosmanpasa University, Tokat, 60100, Turkey

    Fevzi Akbas

  3. Department of Crop and Soil Science, Cornell University, Ithaca, NY, 14853-1901, USA

    Harold M. van Es

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Correspondence to A. Volkan Bilgili.

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Bilgili, A.V., Akbas, F. & van Es, H.M. Combined use of hyperspectral VNIR reflectance spectroscopy and kriging to predict soil variables spatially. Precision Agric 12, 395–420 (2011). https://doi.org/10.1007/s11119-010-9173-6

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