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Zeitschriftenbeiträge (peer-reviewed)

2021

Havardi-Burger, N.; Mempel, H.; Bitsch, V. (2021): Framework for sustainability assessment of the value chain of flowering potted plants for the German market. Journal of Cleaner Production 2021, 129684 (329), S. 1-15. DOI: 10.1016/j.jclepro.2021.129684
 mehr   Open Access

The value chain of flowering potted plants (FPP) is associated with environmental, social and economic sus-
tainability challenges. Indicator-based assessment methods can provide insights into sustainability performance
of agricultural value chains. The FPP value chain is not comparable to other agricultural systems and therefore
cannot be assessed with existing indicator-based tools. In this study, a framework was developed for sustain-
ability assessment of the FPP value chain, from breeding to distribution. The development of the framework
involved defining sustainability themes and subthemes based on the characterization of the value chain and the
investigation of social, environmental and economic sustainability challenges. The generic sustainability
assessment tools, Sustainability Assessment of Food and Agriculture Systems (SAFA) and Response-Inducing
Sustainability Evaluation (RISE), provided the foundation for indicator selection and development. The cur-
rent study emphasized the need for a system-specific view, especially in unique systems such as the FPP value
chain, because generic assessment tools, such as SAFA and RISE, do not cover all sustainability subthemes. Most
of the indicators missing from generic assessment tools were environmental indicators. Environmental assess-
ment is closely related to value chain stages and product-specific processes, therefore indicators were allocated
according to the value chain stages, breeding, production and distribution. Social sustainability themes are
influenced by national and regional socio-economic conditions, such as government provision of healthcare and a
social safety net. Therefore, indicators are allocated based on geographical regions and stakeholder groups. The
economic subthemes are determined by industry structure and sector-specific conditions. The ornamental sector
is characterized by low margins and high uncertainty, related to profitability and vulnerability. Despite the initial
evaluation performed in the current study, in the next step, industry actors need to determine the feasibility of
the indicators. The implementation of the framework developed in the current study will provide further insights
into the value chain, which will guide actors in taking actions for performance improvement and provide
guidance for policy-makers in setting sustainability targets.

Mempel, H.; Jüttner, I.; Wittmann, S. (2021): The potentials of indoor farming for plant production. Automatisierungstechnik 69 (4), S. 287-296. DOI: 10.1515/auto-2020-0044
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Plant production in indoor farming systems offers significant advantages compared to open field orgreenhouse production systems. Especially in terms of quality and the ability for automation the system is superior to the conventional production systems. Concerning resource consumption indoor farming has considerable advantages in regard to water consumption and the use of pesticides.The main disadvantage is the high consumption of electrical energy. Taking advantage of the specific benefits or eliminating the disadvantages, for example by using renewable energies, different potentials and fields of application for indoorfarming arise.The paper outlines the potentials and future fields of application of indoor farming considering the specific differences to conventional production systems related to resource consumption, quality and automation.

Wittmann, S.; Jüttner, I.; Spence, M.; Mempel, H. (2021): Indoor Vertical Farming: konsequente Weiterentwicklung des geschützten Anbaus. Jahrbuch Agrartechnik 2021 (Band 32), S. 1-15. DOI: 10.24355/dbbs.084-202012111306-0
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Climate change and increasing global urbanization accelerate the expansion of protected cultivation systems. However, certain dependences to external weather conditions remain even in modern greenhouses. Indoor vertical farming, on the other hand, pursues complete inde-pendence from external weather conditions with the aim for highly accurate control of all crop parameters. Particularly with regard to the advancing climate change and the need for sustainable resource consumption, there are clear advantages due to the year-round and independent cultivation of plants and raw materials under optimal conditions. The complexity in the optimal networking of the plant-technology systems offers intensive development opportunities for dig-itization and interdisciplinary collaboration.

Goisser, S.; Wittmann, S.; Mempel, H. (2021): Food-scanner applications in the fruit and vegetable sector. Landtechnik 76 (1), S. 52-67. DOI: 10.15150/lt.2021.3264
 mehr   Open Access

In the past few years, portable and smartphone-based diagnostic technologies have found their way into the agri-food industry. The aim of this research was to evaluate the perfor-mance of portable near-infrared (NIR) spectrometers, so called food-scanners, with regard to their predictive accuracy of important quality parameters of fruit and vegetables. Food-scan-ner measurements were performed in combination with destructive measurements of the corresponding quality trait (sugar content, dry matter, relative water content) on a wide range of produce from the fruit and vegetable assortment. This study evaluated dry matter content of apple, avocado, blueberry, table grape and tangerine, which yielded cross validation re-sults (r²) of up to 0.95, 0.87, 0.94, 0.92 and 0.92 respectively. Furthermore, the evaluation of food-scanner spectra for the prediction of sugar content of blueberry, kiwi, mango, persim-mon, table grape, tangerine and tomato yielded cross validations (r²) of up to 0.95, 0.84, 0.80, 0.75, 0.95, 0.93, and 0.87. Furthermore, relative water content of ginger obtained a cross val-idation correlation of r² = 0.91. The results show that these traits can be predicted with a high degree of accuracy using non-destructive measurements performed with three commercially available food-scanners SCiOTM, F-750 Produce Quality Meter, and H-100F. Consequently, food-scanners can be used as objective measurement tools along the supply chain of fresh produce to quickly determine fruit quality. In addition, a practical example shows the poten-tial of these instruments for non-destructive quality assessment in incoming goods control at fruit and vegetable wholesalers over a time period of several weeks. Furthermore, possible areas of application of food-scanners along the supply chain of fresh produce are discussed, possibilities for practical applications are presented and time-saving means are highlightedLANDTECHNIK 76(1), 2021, 52–67Food-scanner applications in the fruit and vegetable sectorSimon Goisser, Sabine Wittmann, Heike MempelIn the past few years, portable and smartphone-based diagnostic technologies have found their way into the agri-food industry. The aim of this research was to evaluate the perfor-mance of portable near-infrared (NIR) spectrometers, so called food-scanners, with regard to their predictive accuracy of important quality parameters of fruit and vegetables. Food-scan-ner measurements were performed in combination with destructive measurements of the corresponding quality trait (sugar content, dry matter, relative water content) on a wide range of produce from the fruit and vegetable assortment. This study evaluated dry matter content of apple, avocado, blueberry, table grape and tangerine, which yielded cross validation re-sults (r²) of up to 0.95, 0.87, 0.94, 0.92 and 0.92 respectively. Furthermore, the evaluation of food-scanner spectra for the prediction of sugar content of blueberry, kiwi, mango, persim-mon, table grape, tangerine and tomato yielded cross validations (r²) of up to 0.95, 0.84, 0.80, 0.75, 0.95, 0.93, and 0.87. Furthermore, relative water content of ginger obtained a cross val-idation correlation of r² = 0.91. The results show that these traits can be predicted with a high degree of accuracy using non-destructive measurements performed with three commercially available food-scanners SCiOTM, F-750 Produce Quality Meter, and H-100F. Consequently, food-scanners can be used as objective measurement tools along the supply chain of fresh produce to quickly determine fruit quality. In addition, a practical example shows the poten-tial of these instruments for non-destructive quality assessment in incoming goods control at fruit and vegetable wholesalers over a time period of several weeks. Furthermore, possible areas of application of food-scanners along the supply chain of fresh produce are discussed, possibilities for practical applications are presented and time-saving means are highlighted.

2020

Wittmann, S.; Jüttner, I.; Mempel, H. (2020): Indoor Farming Marjoram Production—Quality, Resource Efficiency, and Potential of Application . Agronomy 10, 1769 (11). DOI: 10.3390/agronomy10111769
 mehr   Open Access

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.

Goisser, S.; Fernandes, M.; Wittmann, S.; Ulrichs, C.; Mempel, H. (2020): Evaluating the practicability of commercial food-scanners for non-destructive quality assessment of tomato fruit . Journal of Applied Botany and Food Quality 2020 (93), S. 204-214. DOI: 10.5073/JABFQ.2020.093.025
 mehr   Open Access

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, so
called 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.

Havardi-Burger, N.; Mempel, H.; Bitsch, V. (2020): Driving forces and characteristics of the value chain of flowering potted plants for the German market. European Journal of Horticultural Science 85 (4), S. 267-278. DOI: 10.17660/eJHS.2020/85.4.8
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The study investigated the value chain of flowering potted plants supplying the German market and the drivers influencing chain actors. The study builds on strategic and horticultural value chain literature. Data was collected by conducting 20 in-depth interviews with chain actors from different stages in the value chain and analyzed through qualitative content analysis. Results showed that the value chain of flowering potted plants is divided in two pathways due to distinct propagation methods, either generative (seeds) or vegetative (cuttings). Whereas propagation material is generally produced in southern countries, such as Africa and Central America, young plants and potted plants are cultivated within Europe. The paper identified driving forces such as retailer requirements, weather conditions, price pressure and innovations. Furthermore, the study provides an overview of chain activities and processes to help the sector anticipate developments, and support stakeholders in future decisions.

Goisser, S.; Wittmann, S.; Fernandes, M.; Mempel, H.; Ulrichs, C. (2020): Comparison of colorimeter and different portable food-scanners for non-destructive prediction of lycopene content in tomato fruit. Postharvest Biology and Technology 167, 111232, S. 1-8. DOI: 10.1016/j.postharvbio.2020.111232
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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.

Goisser, S.; Mempel, H.; Bitsch, V. (2020): Food-Scanners as a Radical Innovation in German Fresh Produce Supply Chains. International Journal on Food System Dynamics 11 (2), S. 101-116. DOI: 10.18461/ijfsd.v11i2.43
 mehr   Open Access

Originally advertised as tools for end-consumers, portable food-scanners have recently reached a high level of awareness and show potential as instruments for quality assessment along fruit and vegetable supply c hains. The current study explores preferences and concerns of chain actors regarding the implementation of this technology through semi-structured interviews. Results indicate that food-scanners could facilitate quality control at different levels of the fresh produce supply chain by providing fast, non-destructive and objective measurements. Concerns about the application of food-scanners could be identified with respect to potential additional requirements of fruit wholesaler resulting in more pressure on producers. To further a goal-oriented and user-directed development of this new technology, future research should be directed at its impacts on perception of fruit quality along the chain as well as end-consumers’ readiness to use these devices in everyday life.

Havardi-Burger, N.; Mempel, H.; Bitsch, V. (2020): Sustainability Challenges and Innovations in the Value Chain of Flowering Potted Plants for the German Market . Sustainability 12, 1905 (5). DOI: 10.3390/su12051905
 mehr   Open Access

This study investigated the sustainability challenges and the adoption of sustainability innovations along the value chain of flowering potted plants supplying the German market. Data was collected through eighteen in-depths interviews with chain actors from different stages of the value chain and analyzed through qualitative content analysis. The material flow of the value chain begins at the breeding level followed by the propagation level. Cuttings are produced mostly in African countries, rooted cuttings and potted plants are cultivated in Europe. The main environmental challenges include water scarcity, pesticide use and carbon footprint. Social challenges in Africa include low wages and difficult working conditions. In Germany, social challenges include recruitment and retention of employees and product transparency. Economic challenges include profitability and the need to comply with standards. Sustainability driven innovations can address some sustainability challenges. However, their implementation often leads to increased costs, financial risk and complexity of implementation. Furthermore, the lack of product transparency prevents the transfer of sustainability costs to the consumer by offering a sustainable product for a premium price. Business-to-business standards have generally had a positive influence on the adoption of sustainability innovations. But by setting certification as an entry barrier for suppliers, retailers have become more powerful chain actors.

2019

Mempel, H.; Wittmann, S. (2019): Potential and use of artificial lighting in horticulture. 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.

2016

Schwend, T.; Prucker, D.; Peisl, S.; Nitsopoulos, A.; Mempel, H. (2016): The rosmarinic acid content of basil and borage correlates with the ratio of red and far-red light. European Journal of Horticultural Science 81 (5), S. 243-247. DOI: 10.17660/eJHS.2016/81.5.2
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Rosmarinic acid (RA) and caffeic acid (CA) are potent antixodiants and show antimicrobial activity against many fungal plant pathogens. Their biosynthesis employs enzymes of the phenylpropanoid pathway, a pathway that in mustard is regulated by phytochrome. If RA biosynthesis is regulated by phytochromes one would expect that the RA level correlated with the ratio of red to far-red light. In this paper we tested this hypothesis by growing basil and borage under different ratios of red to far-red light. CA and RA contents were measured with state of the art LC-MS/MS. Regression analysis showed that there is a significant inverse correlation of the ratio of red to far-red light and the content of RA, but not of CA. Hence, we conclude that RA biosynthesis is regulated by phytochrome.

Schwend, T.; Beck, M.; Prucker, D.; Peisl, S.; Mempel, H. (2016): Test of a PAR sensor-based, dynamic regulation of LED lighting in greenhouse cultivation of Helianthus annuus. European Journal of Horticultural Science 81 (3), S. 152-156. DOI: 10.17660/eJHS.2016/81.3.3
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The intensity, and consequently the energy consumption, of light emitting diodes (LEDs) can be regulated. Therefore, LEDs can be implemented in new, dynamic energy saving strategies. Recently it has been shown that a program, which adjusts the intensity of a LED to the current solar PAR, reduced its energy consumption by 20%. The effect of a dynamic LED lighting on ornamental crops has not been tested. In this study we compared the growth of the model plant Helianthus annuus under a dynamic versus a static, control LED lighting. The data of this study show that the dynamic LED consumed 21% less energy than a control LED. However, there was no difference in crop quality or time to anthesis.

Schwend, T.; Kriedel, M.; Prucker, D.; Peisl, S.; Mempel, H. (2016): On the role of the light regime in root development of Euphorbia pulcherrima leafy stem cuttings. European Journal of Horticultural Science (EJHS) 81 (3), S. 148-151. DOI: 10.17660/eJHS.2016/81.3.2
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The development of primordial roots of Euphorbia pulcherrima cuttings coincides with a significant increase in photosynthesis. Therefore, Svenson and Davies (1990) suggested that supplementary lighting has no effect on root development of Euphorbia pulcherrima cuttings before primordial roots develop. In this study this hypothesis was experimentally challenged. Cuttings were cultivated with supplementary lighting from the day of sticking and compared to cuttings that were exposed to the same lighting after primordial root development. Our data show that both sets of cuttings developed equally well and both did better than cuttings that were cultivated without supplementary light. Moreover, the data show that light quality had a major impact on root number, length and weight. Therefore, this study confirms the hypothesis of Svenson and Davies (1990) and shows that the positive effect of supplementary lighting is partially mediated by photoreceptors.

2015

Schwend, T.; Prucker, D.; Mempel, H. (2015): Red light promotes compact growth of sunflowers. European Journal of Horticultural Science 80 (2), S. 56-61. DOI: 10.17660/eJHS.2015/80.2.2
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Light quality affects plant morphology. Hence, light quality is an important factor in the cultivation of ornamental plants. The recent advances in LED technology allow producers to adjust light quality to manipulate plant growth. For growers of ornamental plants the primary aim regarding plant morphology is to keep plants short and compact with attractive flowers. However, data on the effect of light quality on plant morphology are still sparse. This study provides data on the effect of different LED light regimes on height and fresh weight of shoot and flower, leaf area and compactness of the model plant Helianthus annuus. Regression analysis of these data shows that red light promotes compact growth.

2012

Kersebaum, A.; Bettin, A.; Mempel, H.; Rath, T.; Ohmayer, G. (2012): WeGa-Student: Hochschulübergreifendes E-Learning Modul im Gartenbau. Landtechnik 67 (5), S. 342-345. DOI: 10.15488/1376
 mehr   Open Access

In einem gemeinsamen E-Learning-Kurs beschäftigten sich Bachelor-Studierende der Hochschulen Osnabrück und Weihenstephan-Triesdorf sowie der Leibniz Universität Hannover im Wintersemester 2011/2012 mit den spezifischen Anforderungen des Gartenbaus an Qualitätsmanagement und Qualitätssicherung. Ziel der Kooperation der drei Hochschulen war es, die Lehre an allen beteiligten Standorten durch die Bündelung von Kompetenzen zu verbessern. Studierende und Dozenten zogen nach Abschluss des Kurses ein überwiegend positives Fazit.


Beiträge zu wissenschaftlicher Konferenz/Tagung (peer-reviewed)

2022

Herppich, W.; Mempel, H.; Schreiner, M.; Huyskens-Keil, S. (2022): Controlled deficit irrigation – effects on growth and water relations of Daucus carota L. roots. Acta Horticulturae ISHS2022, 1335, S. 681-686. DOI: https://doi/org/10.17660/ActaHortic.2022.1335.86
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Regulated deficit irrigation (RDI) comprises controlled reduction of irrigation during certain phases of plant development, accepting minor yield reduction but maximising net returns. To optimise RDI, plant response-based irrigation scheduling may be essential. For this, the knowledge of plant reactions to soil water regimes is indispensable. In field trials (randomized block design, 3 repetitions), ‘Nanthya’ carrots (F1-hybrid) were grown at 20, 40, 60 and 80% field capacity (determined by TDR sensors), yielding soil water contents of 5.1±0.2, 6.2±0.8, 10.1±0.5 and 11.2±0.2% (controls). To guarantee constant controlled soil water contents, plastic rain shelter (76% transparency) were applied. Plots were irrigated if necessary. Treatments started 23 d after sowing (DAS), first sampling was 91 DAS, while final harvest was 106 DAS. On each date, fresh and dry mass, water content, water potential, osmotic potential, turgor and stiffness of carrot tubers were analyzed. Root fresh mass (n=20 carrots per treatment) was higher at high water availability only at the 1st sampling but not at the final harvest. Here, water regime did not affect yield. At this time, root tuber water potential was lower than at the 1st sampling and it was also lower at low soil water availability (20%, 40%). Similar results were obtained for the mean osmotic potential. These variations partially resulted from osmotic adjustment (at 1st harvest) and from a lower root tuber water content at the final sampling. The generally higher modulus of elasticity at this date indicated water volume-independent cell wall-stiffening, i.e. elastic adjustment. The presented results point out that moderately reduced (by 20%) irrigation of carrots does not affect their yield, while pronounced water shortage may induce physiological adjustment.

Wittmann, S.; Jüttner, I.; Liedl, P.; Mempel, H. (2022): Efficiency of the electric energy consumption of an indoor farm by focusing on optimized lighting strategies. Acta Horticulturae ISHS 2022, 1337, S. 73-79. DOI: 10.17660/ActaHortic.2022.1335.86
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Several lighting strategies in an indoor farm are compared regarding the annual electrical energy consumption. Based on measurements of the energy consumption during one experiment, conducted inside the indoor farm at the HSWT, an energy balancing model was calibrated and subsequently validated by a second experiment. The model was then used to calculate the potential reduction of the annual electrical energy consumption concerning several different lighting strategies. Furthermore, different settings of temperature set points and the impact of an optimized heat transfer coefficient as well as a more efficient performance for heating and cooling are considered. The measured and the modeled energy consumption and the values regained by the model showed a high regression coefficient (R2=0.936). The prediction of the energy consumption during the second experiment was also possible (R2=0.738) with a total difference to the measured consumption of 29.1 kWh. Regarding the given technical settings of the indoor farm, the annual electrical energy consumption can be reduced by up to 16% by an adjustment of the temperature strategy while reaching a similar yield. By assuming an optimized technical setting, the relevance of the lighting strategy increased significantly. Based upon this an annual reduction of the electrical energy consumption of up to 21% seemed conceivable.

2019

Goisser, S.; Mempel, H.; Bitsch, V. (2019): Potential Application of Food-Scanners in Fruit and Vegetable Supply Chains and Possible Consequences for the German Market. Proceedings in System Dynamics and Innovation in Food Networks 2019, S. 173-181. DOI: 10.18461/pfsd.2019.1917
 mehr   Open Access

Originally advertised as tools for end-consumers, food-scanners have recently gained publicity and show potential as instruments for quality assessment along the fruit and vegetable supply chain. The current study explores preferences and concerns of chain actors regarding the implementation of this technology through semi-structured interviews. Results indicate that food-scanners could facilitate quality control at different levels of the fresh produce supply chain by providing fast, non-destructive and objective measurements. Concerns about the application of food-scanners could be identified with respect to potential additional requirements of trading companies resulting in more pressure on producers. The use of food-scanners by end-consumers is discussed critically. To further a goal-oriented and user-directed development of this new technology, future research should be directed at its impacts on perception of fruit quality along the chain as well as end-consumers’ readiness to use these devices in everyday life.

Goisser, S.; Krause, J.; Fernandes, M.; Mempel, H. (2019): Determination of tomato quality attributes using portable NIR-sensors. 4th International Conference on Optical Characterization of Materials (OCM), March 13th - 14th, 2019, Karlsruhe, Germany, S. 1-12. DOI: 10.5445/IR/1000092314
 mehr   Open Access

Each material has its own specific spectral signature independent if it is food, plastics, or minerals. During the conference we will discuss new trends and developments in material characterization. You also will be informed about latest highlights to identify spectral footprints and their realizations in industry.

2018

Wittmann, S.; Mempel, H. (2018): Anwendung der Chlorophyllfluoreszenz im Gewächshaus zur Erkennung von Salzstress an Lycopersicon esculentum L. ‘Tastery’. DGG-Proceedings Vol. 8 (2018) (6), S. 1-5. DOI: 10.5288/dgg-pr-sw-2018
 mehr   Open Access


Goisser, S.; Fernandes, M.; Ulrichs, C.; Mempel, H. (2018): Non-destructive measurement method for a fast quality evaluation of fruit and vegetables by using food-scanner. DGG-Proceedings 8 (13), S. 1-5. DOI: 10.5288/dgg-pr-sg-2018
mehr   Open Access

Herppich, W.; Mempel, H.; Geyer, M. (2018): Carrot water relations during postharvest: effects on internal and external product quality. Integrated View of Fruit and Vegetable Quality. eBook Published January 2018, S. 64-72. DOI: 10.1201/9781351073769
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2016

Mempel, H.; Gabriel, A.; Kersebaum, A.; Bettin, A.; Rath, T.; Ohmayer, G. (2016): WeGa-Student: Entwicklung und Erprobung eines standortübergreifenden B.Sc.-Lehrmoduls zum Thema Prozess- und Produktsicherheit im Gartenbau. DGG-Proceedings (German Society of Horticultural Sciences) 6 (5), S. 1-5. DOI: 10.5288/dgg-pr-06-05-hm-2016
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2014

Erguel, R.; Mempel, H. (2014): Berechnung des Carbon Footprints für den Transport von gartenbaulichen Produkten. DGG-Proceedings 4 (10), S. 1-5. DOI: 10.5288/dgg-pr-04-10-re-2014
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Beiträge zu wissenschaftlicher Konferenz/Tagung

2017

Havardi-Burger, N.; Mempel, H.; Bitsch, V. (2017): Supply chain of bedding plants and pot plants in Germany. DGG Proceedings 2017 7 (12), S. 1-5. DOI: 10.5288/dgg-pr-nb-2017
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Zeitschriftenbeiträge

2016

Mempel, H. (2016): Wasserversorgung von Topfpflanzen - vom Produzenten bis zum Verkauf. Taspo (40).

Schwend, T.; Prucker, D.; Haas, H.; Mempel, H. (2016): Wärmestrahlung, LED und Streckungswachstum. Gärtnerbörse (10), S. 62-65.
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Schwend, T.; Prucker, D.; Mempel, H. (2016): Mit Licht hemmen? DEGA Gartenbau (7), S. 56-58.
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2014

Schwend, T.; Prucker, D.; Mempel, H. (2014): Lässt sich das Spektrum von LED-Licht nutzen? DEGA Gartenbau (11), S. 54-55.
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2012

Mempel, H.; Haas, H.; Kohlrausch, F. (2012): Gesunde Poinsettien sind lagerfähig und haltbar. Gärtnerbörse 112 (8), S. 52-56.

2011

Mempel, H.; Haas, H.; Kohlrausch, F. (2011): Strategien zur Einsparung von Energie ohne Qualitätsverluste. Gärtnerbörse 111 (10), S. 38-41.

2010

Mempel, H.; Haas, H.; Kohlrausch, F. (2010): Cool morning ….warm evening. Gärtner + Florist 15 (12), S. 22-24.

Haas, H.; Kohlrausch, F.; Mempel, H. (2010): Poinsettien: Energie sparen ohne Qualitätsverluste. Gärtnerbörse (4), S. 29-31.

Haas, H.; Kohlrausch, F.; Mempel, H. (2010): Lassen sich verkaufsfertige Poinsettien kühl lagern? Gärtnerbörse (6), S. 40-42.


Beiträge in Monografien, Sammelwerken, Schriftenreihen

2018

Goisser, S.; Fernandes, M.; Mempel, H. (2018): Zerstörungsfreie Messmethode zur schnellen Qualitätsbewertung und Haltbarkeitsabschätzung von Lebensmitteln mit Hilfe von Food Scannern. Tagung der Deutschen Gartenbauwissenschaftlichen Gesellschaft. BHGL-Schriftenreihe 33, S. 34.


Wissenschaftliche Poster

2018

Suhl, J.; Schmidt, U.; Mempel, H.; Akyazi, G.; Dannehl, D. (2018): Entwicklung eines sensorbasierten intelligenten Gewächshaus-Managementsystems. BHGL Schriftenreihe Band 33 - 2018 33, S. 151.

Wittmann, S.; Mempel, H. (2018): Anwendung der Chlorophyllfluoreszenz zur Darstellung von Salzstress an Lycopersicon esculentum L. 'Tastery'. Tagung der Deutschen Gartenbauwissenschaftlichen Gesellschaft. BHGL-Schriftenreihe 33, S. 150.

Wittmann, S.; Mempel, H. (2018): Auswirkung einer Mono- und Polychromatischen Belichtung auf den Wuchs und die Photosynthese von Lactuca Sativa. Tagung der Deutschen Gartenbauwissenschaftlichen Gesellschaft. BHGL-Schriftenreihe 33, S. 149.

2017

Schwend, T.; Mühlmann, C.; Beck, M.; Prucker, D.; Mempel, H. (2017): Regulation of greenhouse lighting with a PAR sensor. BHGL-Tagungsband 31/2015, S. 119.

Havardi-Burger, N.; Mempel, H.; Bitsch, V. (2017): Supply chain analysis of bedding plants and pot plants in Germany. 51. DGG & BHGL Jahrestagung 2017.
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2015

Schwend, T.; Prucker, D.; Nitsopoulos, A.; Mempel, H. (2015): Correlation of rosmarinic acid content of basil with the ratio of far-red:red light. BHGL-Tagungsband 31/2015 (31), S. 121.

2013

Hauser, B.; Mempel, H.; Baur, M.; Haas, H.; Kohlrausch, F.; Prucker, D. (2013): Einfluss von LEDs auf das Wachstum und Blühverhalten von Beet- und Balkonpflanzen. DGG Tagung, Bonn, 27.02.-02.03.2013.

2012

Hauser, B.; Mempel, H.; Haas, H.; Kohlrausch, F. (2012): Strategies for saving Energy without Loss of Plant Quality. 2nd Symposium on Horticulture in Europe, Angers, Frankreich, 01.-05.07.2012.

2011

Mempel, H.; Haas, H.; Kohlrausch, F. (2011): Energiekosteneinsparung bei der Produktion von Poinsettien durch vorgezogenen Anbau und anschließender Lagerung. DGG-Tagung Hannover, 23.-26.02.2011.


Medienbeiträge in Zusammenhang mit Forschungsprojekten

2020

Mempel, H. (2020): Indoor Vertical Farming – Ein innovatives System für die Pflanzenproduktion der Zukunft. Homepage: Stiftung Energie & Klimaschutz 2020.
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Das Indoor Vertical Farming spezialisiert sich auf die Produktion von Pflanzen in mehrlagigen, vertikal angeordneten Kultursystemen in einer geschlossenen Gebäudestruktur (Container, Lagerhallen, etc.). Die Lichtenergie für das Pflanzenwachstum wird über künstliche Belichtungssysteme wie LED-Module zur Verfügung gestellt. Von der Temperatur über die Luftfeuchte, Belichtungszeit und -intensität, dem Lichtspektrum bis hin zur Bewässerung kann alles gezielt eingestellt und optimiert werden. Sensoren und Kamerasysteme ermöglichen zudem das Wachstum und die pflanzliche Entwicklung in Echtzeit zu beobachten und kontinuierlich zu optimieren.

2019

Wolf, J.; Mempel, H. (2019): Die Senkrechtpflanzer. Zeitungsartikel: Die Zeit, von Justin Wolff 2019 (45).
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Ackerfläche wird knapp, doch Salat lässt sich gestapelt in Schränken und Regalen züchten. Ist die Technologie schon reif für die Produktion in großen Mengen? 

Newsmeldung HSWT, .; Mempel, H. (2019): Expertin der HSWT beantwortet häufig gestellte Fragen zum Thema Vertical Farming bzw. Indoor Farming. Forschungs-News HSWT, 09.05.2019.
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Vorträge

2019

Goisser, S.; Mempel, H. (2019): Mobile Nahinfrarottechnik im Post-Harvest-Management. Vortrag im Forum "Auf einer Wellenlänge" des Forschungsprojekts "Food-Scanner" am 26.10.2019 in Freising.

Goisser, S.; Mempel, H. (2019): Können Food-Scanner Lebensmittelverluste reduzieren? "Zu gut für die Tonne" - Themenabend zur Lebensmittelverschwendung am 14.05.2019 in Ansbach.

Goisser, S.; Krause, J.; Fernandes, M.; Mempel, H. (2019): Determination of tomato quality attributes using portable NIR-sensors. 4th International Conference on Optical Characterization of Materials (OCM), March 13th - 14th, 2019, Karlsruhe, Germany.

Goisser, S.; Mempel, H.; Bitsch, V. (2019): Potential applications of food-scanners in fruit and vegetable supply chains and possible consequences for the German market. 13th International European Forum (Igls-Forum) on System Dynamics and Innovation in Food Networks, February 18th - 22nd, 2019, Garmisch-Partenkirchen, Germany.

2018

Goisser, S.; Mempel, H. (2018): Der Einsatz portabler Mini-Sensoren vom Erzeuger bis zum Verbraucher. Deutscher Obst & Gemüsekongress (20.-21.09.2018 Düsseldorf).

Mempel, H.; Goisser, S. (2018): Fruchtqualität auf Knopfdruck – Nachernteverluste im Gartenbau. Vortrag beim 1. Bayerisches Symposium gegen Lebensmittelverschwendung – Du bist, was du aufisst!“ Fachsymposium 2018 .
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Mempel, H.; Goisser, S. (2018): Qualitätsveränderungen bei pflanzlichen Lebensmitteln. Vortrag beim Fachkongress "Lebensmittel retten 4.0 - Innovative Verfahren zur Reduzierung von Lebensmittelverlusten" am 16.05.2018 im Bayerischen Staatsministerium für Ernährung, Landwirtschaft und Forsten.
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2016

Mempel, H. (2016): Technische Anpassungspotentiale für gärtnerische Produktionssysteme. Impulsvortrag auf dem HortInnova Expertenworkshop im Forschungsfeld "Anpassung gartenbaulicher Produktionssysteme an sich ändernde Herausforderungen". Vortrag an der Universität Bonn am 15.06..

Mempel, H. (2016): Innovationen in der der Unterglasproduktion - Trends in Deutschland und bei unseren Nachbarn. Vortrag auf der 3. INDEGA Fachgruppentreffen in Grünberg am 14.04.16.

2015

Schwend, T.; Prucker, D.; Mempel, H. (2015): LED – the key for product design. Vortrag auf der Fruit Logistica Berlin, Februar 2015.
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Kersebaum, A.; Mempel, H.; Bettin, A.; Rath, T. (2015): WeGa Student: Ein Leuchtturmprojekt wird Routine. BHGL - Schriftenreihe Band 31, 2015 (31), S. 71.

Bliedung, S.; Mempel, H.; Trierweiler, B. (2015): Ermittlung des optimalen Genusszeitraums von vorgereiften Kiwifrüchten. BHGL - Schriftenreihe Band 31, 2015 (31), S. 67.

Ergül, R.; Mempel, H. (2015): Dynamischer Product Carbon Footprint von Obst und Gemüse – Lösungsansatz zur Ermittlung der Variabilität in den gartenbaulichen Wertschöpfungsketten. BHGL - Schriftenreihe Band 31, 2015 (31), S. 60.

Schwend, T.; Prucker, D.; Mempel, H. (2015): Red light promotes compact growth of sunflowers. BHGL - Schriftenreihe Band 31, 2015 (31), S. 56.


Sonstige Veröffentlichungen

2016

Mempel, H.; Schwend, T.; Prucker, D. (2016): Energieeinsparung und Effizienzsteigerung in der gärtnerischen Produktion durch LED-Belichtungssysteme . zweiseitig.

2015

Emberger-Klein, A.; Ergül, R.; Mempel, H.; Menrad, K. (2015): Carbon-Footprint-Analysen entlang der Wertschöpfungsketten von Obst und Gemüse an ausgewählten Beispielen sowie Erarbeitung eines entsprechenden Zertifizierungs- und Labellingsystems. Gekürzte Fassung des Schlussberichts an das BMBF (Förderkennzeichen: 17004X11). Hochschule Weihenstephan-Triesdorf (HSWT), Wissenschaftszentrum Straubing, Fachgebiet für Marketing und Management Nachwachsender Rohstoffe (MNR). DOI: 10.2314/GBV:860305716
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Mempel, H. (2015): Wasserversorgung von Topfpflanzen vom Produzenten bis zum Verkauf .

2014

Schwend, T.; Prucker, D.; Mempel, H. (2014): Der Einfluss von LED-Licht auf den Rosmarinsäuregehalt in Basilikum. Infodienst Weihenstephan, Dezember 2014 / Januar 2015.
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Mempel, H.; Menrad, K. (2014): Carbon-Footprint-Analysen entlang der Wertschöpfungsketten von Obst und Gemüse.

2013

Prucker, D.; Mempel, H. (2013): Einfluss der verschiedenen Wellenlängen einer LED-Belichtung auf das Pflanzenwachstum. Infodienst Weihenstephan, April 2013.
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Prof. Dr. Heike Susanne Mempel


Hochschule Weihenstephan-Triesdorf

Institut für Gartenbau

T +49 8161 71-5853
heike.mempel[at]hswt.de