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| Terhoeven-Urselmans, Thomas; Fleck, Michael; Michel, Kerstin; Ludwig, Bernard. |
| Near-infrared reflectance spectroscopy is known for its inexpensiveness, rapidity and accuracy and may become a useful tool for the quality assessment of products of the growing organic food market. The objective of this study was to evaluate the ability of visible and near-infrared reflectance spectroscopy (NIRS) to predict several quality parameters (total nitrogen content and the content of different sugars) of organically grown carrots. Spectra of the VIS-NIR region (400-2500 nm) from 120 dried and milled carrot samples were recorded and transformed in the form of (log[1/reflectance]) values. The samples were randomly separated into two groups for calibration (n=60) and validation (n=60). A modified partial least square method was used to develop an... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health Vegetables. |
| Ano: 2005 |
URL: http://orgprints.org/3519/1/3519.pdf |
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| Terhoeven-Urselmans, Thomas; Ilein, Florian; Schmidt, Harald; Ludwig, Bernard. |
| Near-infrared reflectance spectroscopy is known for its inexpensiveness, rapidity and accuracy and may become a useful tool for the assessment of soil fertility. The objec-tives of this study were (i) to evaluate the ability of near-infrared reflectance spectros-copy (NIRS) to predict several soil chemical and biological characteristics of organi-cally managed arable land and (ii) to test if different sample pre-treatments yield comparable results. Spectra of the VIS-NIR region (400-2500 nm) from 56 either fresh or pre-treated (quick-freezing, freeze-drying and grinding) soil samples were recorded. A modified partial least square regression method and cross-validation were used to develop an equation over the whole spectrum (1st to 3rd derivation). Soil... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil biology; Soil quality. |
| Ano: 2007 |
URL: http://orgprints.org/9403/1/9403_Terhoeven%2DUrselmans_Vortrag.pdf |
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