Mid-infrared diffuse reflectance spectroscopy for the quantitative analysis of agricultural soils.
J Agric Food Chem
; 49(2): 766-72, 2001 Feb.
Article
em En
| MEDLINE
| ID: mdl-11262026
ABSTRACT
Soil samples were analyzed conventionally and by mid-infrared diffuse reflectance spectroscopy for total C, total N, pH, and measures of biological activity. Ground, non KBr diluted, samples (n = 180) from experimental plots (two locations, three replicate plots, under plow and no-till practices, three rates of N fertilizer, and from five depths) were scanned from 4000 to 400 cm(-1) (4-cm(-1) resolution, 64 co-added scans) on a DigiLab FTS-60 Fourier transform spectrometer using a custom-made linear sample transport (50 by 2 mm sample area scanned). Results using partial least-squares regression showed that accurate calibrations can be developed for the determination of a number of compositional parameters total C, total N, pH, and many measures of biological activity. In general, the results achieved using mid-infrared spectra were at least as accurate as those found previously using near-infrared spectra and were sometimes significantly better, that is, pH.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Solo
/
Espectrofotometria Infravermelho
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Revista:
J Agric Food Chem
Ano de publicação:
2001
Tipo de documento:
Article
País de afiliação:
Estados Unidos