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Einsatz der Nahinfrarotspektroskopie zur Qualitätskontrolle ökologischer Produkte am Beispiel von Möhren Organic Eprints
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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Kann man mit Nahinfrarot-Spektroskopie die Bodenfruchtbarkeit bestimmen? Organic Eprints
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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Suspension aus Biogasanlagen: Qualität und Wirkung auf den Ertrag Organic Eprints
Raubuch, Markus; Terhoeven-Urselmans, Thomas; Scheller, Edwin.
In the present study we looked on the impact of biogas suspension from the Demeter-farm ‘Gut Sambach’ near Muehlhausen on the microbial and mineral nitrogen pool in fallow and the impact on yield of barley. We could demonstrate the composition of amino acids was not affected by the fermentation process. The applied amount of nitrogen was 65.7 kg Nt ha-1 whereby the proportion of ammonium was 24 % (15.8 kg N ha-1). The yield of barley was significantly increased.
Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover; Composting and manuring.
Ano: 2005 URL: http://orgprints.org/3449/1/3449.pdf
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