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Titre du document / Document title

Mid-infrared spectroscopic determination of soil nitrate content

Auteur(s) / Author(s)

JAHN B. R. (1) ; LINKER R. (2) ; UPADHYAYA S. K. (1) ; SHAVIV A. (2) ; SLAUGHTER D. C. (1) ; SHMULEVICH I. (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Biological and Agricultural Engineering, University of California, Davis, CA 95616, ETATS-UNIS
(2) Faculty of Civil and Environmental Engineering, Lowdermilk Division of Agricultural Engineering, Technion-Israel Institute of Technology, Haifa 32000, ISRAEL

Résumé / Abstract

Mid-infrared (mid-IR) spectroscopy experiments were conducted to detect added nitrate in various soil types both in the laboratory and field. Soil pastes from ten different soils, including sandy loam, clay, and peat soils, were analysed for soil nitrate contents using the Fourier transform infrared (FTIR) attenuated total reflectance (ATR) technique. Nitrate concentrations for the laboratory experiments varied from approximately 0-1000 ppm. NO3-N while concentrations for the field experiments varied from approximately 0-140 ppm. NO3-N. Three-dimensional plots were created by graphing the wavelet deconvoluted values at 32 scales for each sample. From each plot, the volume of the nitrate peak was determined and correlated to nitrate concentrations. Results of the laboratory experiments indicated values for the coefficient of determination R2 as high as 0.99 and standard errors as low as 24 ppm. NO3-N for soil-specific calibrations. Results of the field experiments gave values for R2 as high as 0·98 and standard errors as low as 5 ppm NO3-N for soil-specific calibrations. An alternative technique to determine nitrate content was developed in which wavelet analysis was used to identify a few wavenumbers at which interferences from other ions were minimal. This method produced calibration equations that were soil independent and gave superior results to those obtained based on correlating wavelet deconvoluted volumes to nitrate concentrations.

Revue / Journal Title

Biosystems engineering    ISSN  1537-5110   CODEN BEINBJ 

Source / Source

2006, vol. 94, no4, pp. 505-515 [11 page(s) (article)] (22 ref.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Kidlington, ROYAUME-UNI  (2002) (Revue)

Mots-clés anglais / English Keywords

Inorganic ion

;

Inorganic nitrogen

;

Inorganic anion

;

Nitrogen compounds

;

Soil science

;

Optical method

;

Soil chemistry

;

Soils

;

Nitrates

;

Infrared spectrometry

;

Engineering

;

Agriculture

;

Content

;

Determination

;

Mid infrared radiation

;

Mots-clés français / French Keywords

Ion minéral

;

Azote minéral

;

Anion minéral

;

Azote composé

;

Science du sol

;

Méthode optique

;

Chimie du sol

;

Sol

;

Nitrate

;

Spectrométrie IR

;

Ingénierie

;

Agriculture

;

Teneur

;

Détermination

;

Rayonnement IR moyen

;

Mots-clés espagnols / Spanish Keywords

Ión inorgánico

;

Nitrógeno inorgánico

;

Anión inorgánico

;

Compuesto nitrogenado

;

Ciencia del suelo

;

Método óptico

;

Química del suelo

;

Suelo

;

Nitrato

;

Espectrometría IR

;

Ingeniería

;

Agricultura

;

Proporción

;

Determinación

;

Radiación infrarroja media

;

Localisation / Location

INIST-CNRS, Cote INIST : 4708, 35400014227434.0040

Nº notice refdoc (ud4) : 18029718



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