Die chronologische Liste zeigt aktuelle Veröffentlichungen aus dem Forschungsbetrieb der Hochschule Weihenstephan-Triesdorf. Zuständig ist das Zentrum für Forschung und Wissenstransfer (ZFW).
B.Sc. Julian Hecht,
Sabine Wittmann,
Ivonne Jüttner,
Prof. Dr. Heike Susanne Mempel
Einfluss des Belichtungs- und Kultursystems auf den Wuchs und weitere physiologische Paramater von Solanum lycopersicum (2021) Annual Conference DGG and BHGL 09.03.2021, Stuttgart (online), Germany .
Sabine Wittmann,
Ivonne Jüttner,
Prof. Dr. Heike Susanne Mempel
Indoor vertical farming offers great opportunities regarding a sustainable and consistent production of high-quality herbs and raw materials all year round for the perfume, chemical, or food industry. Cultivation takes place in an enclosed structure, operating predominantly independent from external conditions in multi-layer systems equipped with artificial lighting, enabling extremely high resource use efficiencies with a simultaneous increase in yield. On the other hand, field production in terms of plant quality and harvesting times is highly influenced by environmental conditions, making it difficult to maintain homogenous raw material qualities throughout the year. To show how different light qualities affect the overall efficiency and quality of Origanum majorana grown in an indoor farm, the resource consumption, yield, and cultivation time as well as the essential oil quantity was analyzed, and the efficiencies in terms of energy and land use efficiency calculated. The experimental setup clearly demonstrated that the yield regarding fresh as well as dry matter and oil content was comparable to one square meter of open field production. Based on this, the multi-layer system and the noticeable lowered growth period result in a significantly higher area efficiency compared to the open field, leading to a potential increase of annual yields of dried leave weight and oil contents by up to 21 times. It was also shown that a white spectrum (W) showed similar influence on plant growth and yield as a spectrum consisting of blue and red (B/R). Nevertheless, the LED treatment W did show higher light use efficiencies as well as a better working conditions inside the cultivation chamber. By an integration of indoor vertical farming into existing industrial processes, new and innovative opportunities for a flexible and low-risk supply chain seem feasible and according to German food industry meet the interests of existing stakeholders.
Mehr
M.Sc. Simon Goisser,
Michael Fernandes,
Sabine Wittmann,
Christian Ulrichs,
Prof. Dr. Heike Susanne Mempel
The assessment of tomato fruit quality depends on a variety of extrinsic and intrinsic quality parameters such as color, firmness and sugar content. Conventional measurement methods of these quality parameters are time consuming, require various measurement devices, and in case of intrinsic quality, involve destructive measurements. Latest research focused on the non-destructive determination of these parameters by using spectroscopic measurements. The goal of this study was to evaluate the capability of three commercial-ly available portable and miniaturized VIS/NIR spectrometers, socalled food-scanners, in predicting various tomato quality attributes in a non-destructive way. Additionally, this study evaluated the software provided by manufacturers for building of prediction models by comparing the results derived from those software tools to state-of-the-art software for multivariate analysis. Evaluation of food-scanner spectra resulted in prediction models of high accuracy (r² > 0.90) for tomato fruit firmness, dry matter, total soluble solids and color values L*, a* and h°. Prediction models computed with manufacturer’s software showed similar accuracy to those derived from state-of-the-art evaluation software. Results of this study illustrate the great potential of commercial food-scanners for non-destructive quality measurement. Further important features of food-scanners with respect to the application along the fresh produce supply chain are addressed.
Mehr
M.Sc. Simon Goisser,
Sabine Wittmann,
Michael Fernandes,
Prof. Dr. Heike Susanne Mempel,
Christian Ulrichs
Lycopene, the red colored carotenoid in tomatoes, has various health benefits for humans due to its capability of scavenging free radicals. Traditionally, the quantification of lycopene requires an elaborate extraction process combined with HPLC analysis within the laboratory. Recent studies focused simpler methods for determining lycopene and utilized spectroscopic measurement methods. The aim of this study was to compare non-destructive methods for the prediction of lycopene by using color values from colorimeter measurements and Vis/NIR spectra recorded with three commercially available and portable Vis/NIR spectrometers, so called food-scanners. Tomatoes of five different ripening stages (green to red) as well as tomatoes stored up to 22 days after harvest were used for modeling. After measurement of color values and collection of Vis/NIR spectra the corresponding lycopene content was analyzed spectrophotometrically. Applying exponential regression models yielded very good prediction of lycopene for color values L*, a*, a*/b* and the tomato color index of 0.94, 0.90, 0.90 and 0.91, respectively. Color value b* was not a suitable predictor for lycopene content, whereas the (a*/b*)² value had the best linear fit of 0.87. In comparison to color measurements, the cross-validated prediction models developed for all three food-scanners had coefficients of determination (r²CV) ranging from 0.92 to 0.96. Food-scanners also can be used for additional measurements of internal fruit quality, and therefore have great potential for fruit quality assessment by measuring a multitude of important fruit traits in one single scan.
Mehr
Prof. Dr. Heike Susanne Mempel,
Sabine Wittmann
Berechtigungen: Peer Reviewed
Potential and use of artificial lighting in horticulture (2019) Light and Engineering 27 , S. 31-41.
The use of supplemental lighting in horticulture is continuously increasing. Compared to HPS luminaires LED have significant advantages like the possibility of a targeted compilation of the spectrum, the use of dimmable and dynamic adaptable luminaires, the insensitivity to the switching frequency, less heat radiation and the and the high energy efficiency. Experiments with monochromatic lighting show potentials for influencing various quality factors with specialized light spectra in order to reach the targeted plant quality. However, many questions are still open, resulting in a rather low transfer rate of specific lighting strategies in the applied horticulture. Beneficial effects of interlighting were shown in greenhouse experiments and their potentials discussed. In the future higher requirements on plant and fruit quality and a sustainable use of resources will result in a greater importance for specialized lighting strategies and advanced technological solutions.
Sabine Wittmann,
Prof. Dr. Heike Susanne Mempel
Berechtigungen: Open Access
Berechtigungen: Peer Reviewed
Anwendung der Chlorophyllfluoreszenz im Gewächshaus zur Erkennung
von Salzstress an Lycopersicon esculentum L. ‘Tastery’ (2018) DGG-Proceedings Vol. 8 (2018) (6), S. 1-5.
DOI: 10.5288/dgg-pr-sw-2018
Sabine Wittmann,
Prof. Dr. Heike Susanne Mempel
Auswirkung einer Mono- und Polychromatischen Belichtung auf den Wuchs und die Photosynthese von Lactuca Sativa (2018) Tagung der Deutschen Gartenbauwissenschaftlichen Gesellschaft. BHGL-Schriftenreihe 33 , S. 149.
Sabine Wittmann,
Prof. Dr. Heike Susanne Mempel
Anwendung der Chlorophyllfluoreszenz zur Darstellung von Salzstress an Lycopersicon esculentum L. 'Tastery' (2018) Tagung der Deutschen Gartenbauwissenschaftlichen Gesellschaft. BHGL-Schriftenreihe 33 , S. 150.
Betreuung der Publikationsseiten
Gerhard Radlmayr
Referent für Wissenstransfer und Forschungskommunikation
Wir verwenden Cookies. Einige sind notwendig für die Funktion der Webseite, andere helfen uns, die Webseite zu verbessern. Um unseren eigenen Ansprüchen beim Datenschutz gerecht zu werden, erfassen wir lediglich anonymisierte Nutzerdaten mit „Matomo“. Um unser Internetangebot für Sie ansprechender zu gestalten, binden wir außerdem externe Inhalte unserer Social-Media-Kanäle ein.
