Oliver Körner

Oliver Körner
Leibniz-Institute of Vegetable and Ornamental Crops · Next-Generation Horticultural Systems (HORTSYS)

MSc, PhD

About

110
Publications
47,856
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,286
Citations
Citations since 2017
38 Research Items
811 Citations
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
2017201820192020202120222023050100150200
Introduction
Greenhouse horticultural scientist with main interest in resource conservation in intensive horticultural crop production. He works on understanding the underlying processes and interactions between climate, microclimate, plants and pest/diseases in protected environments as greenhouses or plant factories. For that he researches in the usability of combined systems of mathematical models and sensors (soft-sensors) for optimised crop production.
Additional affiliations
November 2017 - present
Leibniz-Institute of Vegetable and Ornamental Crops
Position
  • Head of Department
January 2016 - October 2017
Danish Technological Institute
Position
  • Senior Researcher
December 2008 - December 2015
AgroTech
Position
  • R&D Specialist
Education
January 1999 - June 2003
Wageningen University & Research
Field of study
  • Production Ecology & Resource Conservation
October 1992 - October 1998
Leibniz Universität Hannover
Field of study
  • Horticultural Sciences

Publications

Publications (110)
Article
Full-text available
Improving existing greenhouse structures in terms of insulation and other features can save energy with significantly lower investment costs than building new greenhouses. Within the EU Framework VI project GREENERGY a decision support system has been developed that offers the potential to be used by the advisory services for growers all over Europ...
Article
Full-text available
Rising urban food demand is being addressed by plant factories, which aim at producing quality food in closed environment with optimised use of resources. The efficiency of these new plant production systems could be further increased by automated control of plant health and nutritious composition during cultivation, allowing for increased produce...
Article
Full-text available
Indoor crop cultivation systems such as vertical farms or plant factories necessitate artificial lighting. Light spectral quality can affect plant growth and metabolism and, consequently, the amount of biomass produced and the value of the produce. Conflicting results on the effects of the light spectrum in different plant species and cultivars mak...
Article
Full-text available
Mechanistic models of canopy photosynthesis usually upscale leaf photosynthesis to crop level. A detailed prediction of canopy microclimate with accurate leaf morphological and physiological model parameters is the prerequisite for accurate predictions. It is well established that certain leaf model parameters (V cmax , J max) of the frequently ado...
Article
Full-text available
Fresh vegetables available on Northern European markets usually originate from a high number of sources. Environmental impacts for these goods typically arise from the resources used in production and the long-distance transport in air-conditioned trucks. As such, environmental impacts are mainly attributed to direct energy consumption, water use a...
Article
Full-text available
The integration of closed biomass cycles into residential buildings enables efficient resource utilization and avoids the transport of biowaste. In our scenario called Integrated Cycles for Urban Biomass (ICU), biowaste is degraded on-site into biogas that is converted into heat and electricity. Nitrification processes upgrade the liquid fermentati...
Article
Full-text available
The effect of considering cultivar differences in stomatal conductance (gs) on relative air humidity (RH)-related energy demand was addressed. We conducted six experiments in order to study the variation in evapotranspiration (ETc) of six pot rose cultivars, investigate the underlying processes and parameterise a gs-based ETc model. Several levels...
Article
Full-text available
Aquaponics, the water-reusing production of fish and crops, is taken as an example to investigate the consequences of upscaling a nature-based solution in a circular city. We developed an upscaled-aquaponic scenario for the German metropolis of Berlin, analysed the impacts, and studied the system dynamics. To meet the annual fish, tomato, and lettu...
Article
Full-text available
Combining information of plant physiological processes with climate control systems can improve control accuracy in controlled environments as greenhouses and plant factories. Through that, resource optimization can be achieved. To predict the plant physiological processes and implement them in control actions of interest, a reliable monitoring sys...
Article
Crop morphological parameters such as crop architecture with individual leaf size and leaf size distribution largely determine growth and production of a greenhouse tomato crop. Leaf morphological variables such as leaf mass, leaf surface area and leaf thickness are important for crop-environment interaction. As such, these variables are essential...
Article
Understanding the interaction of leaf stomatal state and environmental conditions is one prerequisite to predict leaf photosynthesis and transpiration rates at different spatial and temporal scales, which adds to the implementation of smarter climate control algorithms in greenhouses. Non-invasively capturing data of stomatal density, size and aper...
Article
Full-text available
Combining information of plant physiological processes with climate control systems can improve control accuracy in controlled environments as greenhouses and plant factories. Through that, resource optimization can be achieved. To predict the plant physiological processes and implement them in control actions of interest, a reliable monitoring sys...
Article
High relative air humidity (RH ≥ 85%) is frequent in controlled environments, and not uncommon in nature. In this review, we examine the high RH effects on plants with a special focus on stomatal characters. All aspects of stomatal physiology are attenuated by elevated RH during leaf expansion (long-term) in C3 species. These include impaired openi...
Article
Full-text available
In contrast to conducting measurements on single plants, canopy gas exchange monitored continuously and for large batches of plants can give high-value data for crop physiological models. To this end, a system including eight airtight greenhouse cabins with a ground area of 28.8 m2 and a volume of 107.8 m3 each was designed for measuring the CO2 an...
Article
InfoGrow 2.0 is a model-based multi-source decision support system for energy and production management, which can help greenhouse nurseries continue to increase the energy efficiency achieved over the past years. So far, energy savings are the result of investments in energy saving measures, production of less heat consuming cultivars and, to some...
Article
Full-text available
Interruptive electricity supply Due to new electricity generation and supply schemes, optimising cost and return in greenhouse production could be achieved with interruptive schemes for supplementary lighting (SL). We analysed the effect of interrupted SL (ISL) on both the cost of electricity and crop yield of tomato cultivation during a winter in...
Chapter
Model based decision support and automation in horticulture is today accompanied by the development of Industry 4.0. I.e., while all greenhouse technological systems evolved from simple structures without automatized climate control and sensors (and thus no option for model based climate control or decision support systems), today greenhouses are a...
Article
Full-text available
In greenhouse horticulture, evaporative demand varies between seasons. For instance, plants are typically exposed to low relative air humidity (RH) during summer, whereas elevated RH prevails in winter. Since high RH during cultivation impairs stomatal functioning, some opposite changes might be expected, when plants are subjected to long-term low...
Article
Full-text available
Minimizing mass loss during drying and storage without compromising quality is crucial for the onion industry. An experiment was carried out to monitor the quality changes related to mass loss and to develop a robust mechanistic model to predict mass loss of onion bulbs during drying and storage. Bulbs were dried for 14 days at 20 °C or 35 °C follo...
Article
Full-text available
Increasing the light level in protected cultivation of ornamental crops via supplementary lighting is critical to enhance both production and external quality especially during the periods of low light availability. Despite wide applications the effects of light intensities were not previously addressed on water loss pathways. In this study rose pl...
Chapter
Full-text available
In aquaponics, nutrients originate mainly from the fish feed and water inputs in the system. A substantial part of the feed is ingested by the fish and either used for growth and metabolism or excreted as soluble and solid faeces, while the rest of any uneaten feed decays in the tanks. While the soluble excretions are readily available for the plan...
Chapter
Full-text available
Traditional aquaponics systems were arranged in a single process loop that directs nutrient-rich water from fish to the plants and back. Given the differing specific nutrient and environmental requirements of plants and fish, such systems presented a compromise to the ideal conditions for rearing of both, thus reducing the efficiency and productivi...
Chapter
Full-text available
Mathematical models can take very different forms and very different levels of complexity. A systematic way to postulate, calibrate and validate, as provided by systems theory, can therefore be very helpful. In this chapter, dynamic systems modelling of aquaponic (AP) systems, from a systems theoretical perspective, is considered and demonstrated t...
Article
DOWNLOAD: USE THIS LINK: https://authors.elsevier.com/c/1YYwg,70zHZLUT A R T I C L E I N F O Keywords: aquaponics horticulture systems modelling integrated multi-trophic aquaculture aquaculture hydroponics A B S T R A C T Decoupled multi-loop aquaponics systems separate the recirculated aquaculture system (RAS) and hydroponic (HP) units from each...
Conference Paper
Full-text available
Simulation of crop photosynthesis is commonly done with crop models only upscaling leaf photosynthesis models to the crop level. One of the most common procedures is using a weighted summation of instantaneous photosynthesis in several layers in the crop applying Gaussian Integration. In this procedure, usually only light interception is varied, wh...
Article
Full-text available
A long shelf life of onions (Allium cepa L.) is of high importance in the onion industry. Onions are dried and stored in large wooden boxes that are difficult to access. Monitoring temperature and relative humidity during these processes is challenging. Moreover, quality may change in storage without being noticed. Therefore, there is a need to fin...
Data
Percentage of stones and size distribution of usable onions in the two-ton boxes. (DOCX)
Data
Incidence of diseases (%) during storage of the six onion batches. (DOCX)
Data
All microclimate and quality data. (XLSX)
Article
Full-text available
For optimal cultivation planning, a model of a double-layer multigutter system (MGS) was designed with lettuce as model crop, and implemented in an existing greenhouse simulator Virtual Greenhouse (VG). The model is based on deterministic equations of lettuce physiology, and validated with data attained from a commercial lettuce producer with singl...
Article
There is a recognized need for mineralizing aquaculture-derived sludge in aquaponics systems in order to reduce waste production. Many recent studies of aquacultural waste treatment have focused only the production of biogas as opposed to the potential for mineralization of nutrient-rich sludge. Upflow anaerobic sludge blanket (UASB) reactors provi...
Article
Chlorophyll fluorescence serves as a proxy photosynthesis measure under different climatic conditions. The objective of the study was to predict PSII quantum yield using greenhouse microclimate data to monitor plant conditions under various climates. Multilayer leaf model was applied to model fluorescence emission from actinic light-adapted (F') le...
Article
High relative air humidity (RH ≥ 85%) impairs stomatal functionality, attenuating plant capacity to cope with abiotic stress. Previous studies were limited to C3 species, so the RH effect on stomatal physiology of CAM plants remains unexplored. We addressed the topic through comparisons of C3 and CAM states in a facultative CAM species. These state...
Article
Full-text available
Greenhouse and crop models are largely developed within scientific or semi-scientific working groups, with only little commercial interest. The usage of many different modelling tools and the creation of personal models for research and analyses, as well as the protective state of mind of many developers, have led to a large number of simulation mo...
Article
While dynamic greenhouse climatic regimes are often applied to achieve energy efficiency, dynamic mechanistic models can assist in climate control decisions, and to elucidate plant stress under extreme microclimatic conditions. The present study developed a couple model with three integrated sub-models to predict net leaf photosynthesis (Pnl), stom...
Article
Under a dynamic greenhouse climate control regime, temperature is adjusted to optimise plant physiological responses to prevailing irradiance levels; thus, both temperature and irradiance are used by the plant to maximise the rate of photosynthesis, assuming other factors are not limiting. The control regime may be optimised by monitoring plant res...
Article
Full-text available
CAM active short day plants as e.g., Kalanchoë, induce flowers after a specific short day period, usually controlled with light and black-out screens. Day length is commonly controlled with a long day treatment as start up cultivation, followed by a prolonged short day period for flower induction. Kalanchoë changes from young plants with C3 to olde...
Article
Full-text available
Grey mould (Botrytis cinerea) is one of the most severe diseases in greenhouse crops. For its control, humidity is kept low and chemical and biological control agents are used. An early warning system for disease outbreak likelihood would help to improve B. cinerea management. In greenhouses with model-based climate control there is scope for autom...
Article
Full-text available
Modern highly insulated greenhouses are more energy efficient than conventional types. Furthermore applying dynamic greenhouse climate control regimes will increase energy efficiency relatively more in modern structures. However, this combination may result in higher air and crop temperatures. Too high temperature affects the plant photosynthetic r...
Article
Full-text available
Modern greenhouse climate control requires use of advanced climate-control models; however, adoption of advanced climate-control models in today's industrial greenhouse production is hindered by the shortcoming of existing climate-control systems to support non-invasive composition of independently-developed climate-control models. Despite the fact...
Article
Full-text available
Air temperature with modern greenhouse climate control often allows more freedom for dynamic behaviour than standard rigid greenhouse climate regimes. These types of climate control strategies potentially result in severe microclimate conditions such as high crop temperature, which affects photosynthesis and the major sensitive sites in the photosy...
Article
Full-text available
New greenhouse technology develops fast and there are many new possibilities to reduce greenhouse energy consumption. The most energy savings can usually be achieved when investing in new construction with the newest technology of energy harvesting, storage and re-usage. In existing greenhouses, however, a high energy reduction is also possible. So...
Article
Full-text available
Crop specific models for plant growth and -development and their sub-models as e.g. microclimate or photosynthesis are needed for decision support systems (DSS) and model based climate control. As most cultivated greenhouse horticultural production crops metabolise using the C3 pathway, most attention in model was put on model development of those...
Article
Full-text available
Mit dem Aufkommen komplexer Klimasteuerungsanforderungen wie der Mitteltemperatursteuerung zur Energieeinsparung oder der so genannten DIF-Steuerung wurden auch Anpassungen bei der Klimasteuerungssoftware notwendig. Die gemeinsame Anwendung von Klimasteuerungscomputern und Entscheidungshilfesystemen erwiesen sich dabei als eine gute Option, um Klim...
Technical Report
Full-text available
The aim of this study was to create a cradle to gate comparative screening of the global warming potential (GWP) of pork produced 1. Conventionally, 2. According to biological means, and 3. At the planned PigCity Farm. The co-produce tomato was included in the study. The screening LCA for the impact group GWP is build up as a full LCA, where howeve...
Article
Door op twaalf bedrijven in drie meetronden van zes weken wekelijks te oogsten en de gerealiseerde klimaatdata te analyseren bleek dat het microklimaat rond de plant van grote invloed was op het ontstaan van pokken in de naoogstfase. Hoe vochtiger het is, hoe groter de snelheid van Botrytisontwikkeling. Overdag moeten de omstandigheden rond de bloe...
Article
Schade aan kasgewassen door Botrytisaantasting (smet) is één van de belangrijkste knelpunten in de kasteelt. Te hoge luchtvochtigheid en lokale koude plekken met condensvorming zijn de belangrijkste oorzaken van smet. Het instellen van een droog kasklimaat kost veel energie, maar door het gebruik van een waarschuwings- of sturingsmodel is het mogel...
Article
Samenvatting Dit rapport beschrijft de methoden en resultaten van deelproject 6 van het Parapluplan “Botrytis in relatie tot energie bij gerbera”. Dit deelproject behelsde het integreren van kennis over botrytis en gerberagroei uit de overige deelprojecten in een voorspellend computermodel. Het Parapluplan was een 3-jarig onderzoeksprogramma waarin...
Article
Botrytis heeft een grote invloed op de kwaliteit van de geoogste gerbera. Veelal worden partijen bloemen afgekeurd op de veiling met flinke nadelige gevolgen voor de aanleverende tuinder. In het vervolg van het handelskanaal is de schade eveneens groot. Gerbera vormt vaak onderdeel van een boeket en de marktwaarde van het gehele product daalt wanne...
Article
Full-text available
Botrytis cinerea is one of the main postharvest problems in gerbera cut flowers. There are clear differences among growers in the percentage of flowers showing symptoms of Botrytis infection after harvest. Because the factors causing these differences are uncertain, cultivation parameters of twelve different growers were followed and a nursery comp...
Technical Report
Full-text available
2.1 Goal and Scope The current analysis and report follows the ISO 14044:2006 guidelines (ISO, 2006). The aim of this study was to identify products/processes with a major contribution to the global warming potential of one package of 125 g smoked trout, cultivated in Danish aquaculture, fed with industrial fish food (Biomar), and processed at DanF...
Article
Full-text available
Detailed measurements of crop photosynthesis at supra-optimal temperatures and high CO2 levels, to validate models for use in model-based greenhouse climate control, are still lacking. We performed CO2 gas exchange measurements to estimate gross crop photosynthesis (Pgc) from measured net crop gas exchange in the daytime, and at night, with tempera...
Article
Full-text available
Development of future greenhouse climate control Next to production of high quality plants, the greenhouses of the future wil'l have to produce energy too. In order to ensure optimal output, there should be improved automation of the climate control system S uch automation requires climate con­ trol software based on models that can predict the act...
Article
greenhouses are the only feasible option for developing agriculture in many areas of the world. They are needed in cold countries in order to have produce during the winter and it is also extremely urgent in many marginal lands in Mediterranean and hot countries in the world where maximizing the use of resources and obtaining more crop per drop or...
Technical Report
Full-text available
The Energy Auditing Tool (EAT) was first tested using version 1.06 with greenhouse profiles representative of actual configurations (provided by the SME and IAG partners) as part of Deliverable 10 (main responsible partner WU). The actual energy consumption data of these configurations was compared with that simulated by the EAT version 1.06. The s...
Article
Full-text available
paper describes the effects of EOD supplemental lighting with different red/far-red ratios on plant development of potted chrysanthemums (Chrysanthemum morifolium Ramat. 'Coral Charm') grown under different photoperiods. The effects of three different EOD treatments were tested with red/far-red light ratios (R/FR; 600-700 nm/700-800 nm) of 0.4, 0.7...
Technical Report
Full-text available
The following document gives an overview of the Energy Auditing Tool (EAT). A detailed description of the underlying calculus and the user interface is contained within the document D6/D7/D8: Reference Greenhouse Specifications, Core Calculation module and Graphical User Interface module for the Energy Auditing Tool. A detailed user manual for the...
Article
Full-text available
Earlier, different dynamic greenhouse climate regimes were designed with various aims as energy saving, biocide reduction or reduction of chemical growth retardants that are used for quality improvement. The aim of this research was to create a decision support tool in order to decide at which week of the year to use which climate control regime fo...
Article
Full-text available
Controlling light quality at the end of day (EOD) by elimination of twilight can decrease elongation of some potted plants, but may depend on the duration of the photoperiod. This paper describes the effects of EOD supplemental lighting with different red/far-red ratios on plant development of potted chrysanthemums (Chrysanthemum morifolium Ramat....
Article
Deense onderzoekers hebben een project afgerond dat de naoogstkwaliteit van potplanten voorspelt. Met modellen worden de gewasmonitoring en de kwaliteit aan elkaar gekoppeld. Daarmee is te bepalen hoe lang de plant in een gemiddelde huiskamer meegaat. Door deze manier van werken zijn meer potplanten te verkopen. Op een label zou de minimale houdbaa...
Article
Full-text available
At low light levels measured and in a dynamic greenhouse climate, crop photosynthesis does not match prediction by photosynthesis models. In order to address this problem, a greenhouse scale crop photosynthesis measuring system was designed to generate data that can be used to validate crop photosynthesis models. The system is based on net CO2 exch...
Article
Full-text available
Abstract. Greenhouse energy-saving and biocide reduction can be achieved through dynamic greenhouse climate control with computerized model-based regimes. This can be optimized when next to greenhouse macroclimate (i.e., the aerial environment) also, the crop microclimate is predicted. The aim of this article was to design and apply a simple determ...
Article
Full-text available
In EU gefinancierd onderzoek van onder andere Wageningen Universiteit is een op modellen gebaseerd adviessysteem voor energiegebruik in kassen ontwikkeld. Hiermee kunnen voorlichters en telers energieverbruik en productie berekenen wanneer in bestaande kassen energiebesparingsmaatregelen genomen worden. Maatregelen zoals dek- en gevelisolatie, sche...
Article
Full-text available
Supplementary lighting is mainly used with a fixed schedule and switched on when outside radiation falls below a certain threshold. A more dynamic control could increase the crop growth / energy consumption ratio. A daily light integral (DLI) or an average DLI over several days (ADLI) can be used as control. Crop growth could be increased when supp...