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Determination of Clay and Other Soil Properties by Near Infrared Spectroscopy

Steins Laboratorium, Ladelundvej 85, 6650 Brørup, Denmark

View larger version (36K): [in a new window]   Fig. 1. Geographic distribution of samples in sample Set 1. The number of samples within each county is shown.

View larger version (17K): [in a new window]   Fig. 2. Clay results obtained by cross validation on sample Set 2. Calibration was performed in the wavelength range 408 to 2492 nm after first derivative treatment of spectra.

View larger version (20K): [in a new window]   Fig. 3. Clay results obtained by cross validation on samples containing <26% clay from sample Sets 1 and 2. Calibration was performed in the wavelength range 408 to 2492 nm after first derivative treatment of spectra.

View larger version (19K): [in a new window]   Fig. 4. Spectral profiles of samples in sample Set 1 after first derivative treatment together with the correlation plot showing the correlation between wavelengths and clay content. The y axis shows the correlation coefficient.

View larger version (18K): [in a new window]   Fig. 5. Results obtained for total C by cross validation on combined sample Sets 1 and 2. Calibration was performed in the wavelength range 408 to 2492 nm after first derivative treatment of spectra.

View larger version (15K): [in a new window]   Fig. 6. Validation results obtained for total C on the independent sample Set 4 using calibration model developed on combined samples Set 1 and 2 (wavelength range 408 to 2492 nm, first derivative treatment of spectra). T-outliers were not removed.

View larger version (20K): [in a new window]   Fig. 7. Silt results obtained by cross validation on sample Set 1. Calibration was performed in the wavelength range 408 to 2492 nm after first derivative treatment of spectra.

View larger version (20K): [in a new window]   Fig. 8. Sand results obtained by cross validation on sample Set 1. Calibration was performed in the wavelength range 408 to 2492 nm after first derivative treatment of spectra.