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- Shepherd, Keith D., et al. Show all 5 Authors
- Geoderma 2006 v.132 no.3-4 pp. 273
- soil; spectral analysis; near-infrared reflectance spectroscopy; calibration; geographical variation; clay minerals; soil organic carbon; iron; cation exchange capacity; soil fertility; soil properties; regression analysis
- ... There has been growing interest in the use of diffuse infrared reflectance as a quick, inexpensive tool for soil characterization. In studies reported to date, calibration and validation samples have been collected at either a local or regional scale. For this study, we selected 3768 samples from all 50 U.S. states and two tropical territories and an additional 416 samples from 36 different countr ...