Semi-closed greenhouses have been developed in which window ventilation is minimized due to active cooling, enabling enhanced CO2 concentrations at high irradiance. Cooled and dehumidified air is blown into the greenhouse from below or above the canopy. Cooling below the canopy may induce vertical temperature gradients along the length of the plants. Our first aim was to analyze the effect of the positioning of the inlet of cooled and dehumidified air on the magnitudes of vertical temperature and VPD gradients in the semi-closed greenhouses. The second aim was to investigate the effects of vertical temperature gradients on assimilate production, partitioning, and fruit growth. Tomato crops were grown year-round in four semiclosed greenhouses with cooled and dehumidified air blown into the greenhouses from below or above the crop. Cooling below the canopy induced vertical temperature and VPD gradients. The temperature at the top of the canopy was over 5°C higher than at the bottom, when outside solar radiation was high (solar radiation >250 J cm-2 h-1). Total dry matter production was not affected by the location of the cooling (4.64 and 4.80 kg m-2 with cooling from above and from below, respectively). Percentage dry matter partitioning to the fruits was 74% in both treatments. Average over the whole growing season the fresh fruit weight of the harvested fruits was not affected by the location of cooling (118 vs 112 g fruit-1). However, during summer period the average fresh fruit weight of the harvested fruits in the greenhouse with cooling from below was higher than in the greenhouse with cooling from above (124 vs 115 g fruit-1).
DOCUMENT
A (semi-)closed greenhouse is a novel greenhouse with an active cooling system and temporary heat storage in an aquifer. Air is cooled, heated and dehumidified by air treatment units. Climate in (semi-)closed greenhouses differs from that of conventional open greenhouses. The aims of our research were first, to analyze the effect of active cooling on greenhouse climate, in terms of stability, gradient and average levels; second, to determine crop growth and production in closed and semi-closed greenhouses. An experiment with tomato crop was conducted from December 2007 until November 2008 in a closed greenhouse with 700 W m-2 cooling capacity, two semi-closed greenhouses with 350 and 150 W m-2 cooling capacity, respectively, and an open greenhouse. The higher the cooling capacity, the more independent the greenhouse climate was of the outside climate. As the cooling ducts were placed underneath the plants, cooling led to a remarkable vertical temperature gradient. Under sunny conditions temperature could be 5°C higher at the top than at the bottom of the canopy in the closed greenhouse. Cumulative production in the semi-closed greenhouses with 350 and 150 W m-2 cooling capacity were 10% (61 kg m-2) and 6% (59 kg m-2) higher than that in the open greenhouse (55 kg m-2), respectively. Cumulative production in the closed greenhouse was 14% higher than in the open greenhouse in week 29 after planting but at the end of the experiment the cumulative increase was only 4% due to botrytis. Model calculations showed that the production increase in the closed and semi-closed greenhouses was explained by higher CO2 concentration.
LINK
Bitter gourd is also called sopropo, balsam-pear, karela or bitter melon and is a member of the cucumber family (Cucurbitaceae). It is a monoecious, annual, fast-growing and herbaceous creeping plant. The wrinkled fruit of the bitter gourd is consumed as a vegetable and medicine in Asia, East Africa, South America and India. The aim of this bitter gourd cultivation manual is to make this cultivation accessible to Dutch growers and in this way be able to meet market demand. In addition, this cultivation manual aims to provide insight into the standardized production of the medicinal ingredients in the fruit.
DOCUMENT
The two-year education programme HiPerGreen initiated by Inholland University of Applied Sciences came to a closure on Friday 27th September 2019 at the World Horti Center in Naaldwijk. The Final symposium gave consortium partners and other guests the opportunity to learn about the HiPerGreen’s team achievements and the various outputs the programme delivered. After the welcome word of lector Robotica Cock Heemskerk, Tom KerneyMitchell, biology researcher, summarized the efforts that the team made in plant monitoring (ranging from growth monitoring and prediction, chamber testing research to delivering fusarium maps to growers). Next Lucien Fesselet, project manager at HiPerGreen and CTO of Applied Drone Innovations) took the public through the team’s technology fails, trials and successes over the two-year programme. Sheelagh Bouvier, market researcher for HiPerGreen, shortly explained that she conducted desk research, field visits in greenhouses, interviews with growers and IP research. Then partner Roy van Rosmalen from Ter Laak Orchids, explained how crucial data was in order to run large orchid greenhouses. He saw HiPerGreen’s monitoring solutions such as the drone and the rail system as the answers to current data gaps. Mauro Gallo, lector Biomimicry at InHolland, announced HiPerGreens follow up project Flapping Wings. The symposium’s final speaker was William Simmonds, CEO of Applied Drone Innovations , a spinoff startup born from the HiPerGreen programme. The symposium was concluded with a drink.
DOCUMENT
On April 12th 2019, researchers, students and consortia gathered at the World Horti Centre for an update on the overall status of the HiPerGreen project. The day consisted of presentations from a variety of the HiPerGreen students, staff and guest speakers. There were a variety of exciting updates from the technological and biological realms of the project, as well as an insightful presentation from Deliflor’s Geert Van Geest on Deliflor and their interests in imaging of chrysanthemums. Several new pieces of technology have arisen from the HiPerGreen project. The first being a rail-based imaging system capable of traversing the greenhouse using the heating pipes commonly found in Dutch greenhouses. The drone landing dock has also taken great steps forward and finally, HiPerGreen has partnered with drone manufacture Avular, a company working on the world’s first ‘ultra-wide band’ localized indoor drone. From a biological standpoint significant progress has been made regarding long-term plant monitoring with a focus on reducing fusarium occurrence in the crop. Students are working in climate chambers to model the symptoms of fusarium infection in orchids. Students are also working at Deliflor using the railsystem to measure uniformity in chrysanthemum test crops. Research with the multispectral camera continued and the team hopes to integrate the imaging into mass plant monitoring. The sympoium was concluded with a drink.
DOCUMENT
Agriculture and horticulture are essential for ensuring safe food to the growing global population, but they also contribute significantly to climate change and biodiversity loss due to the extensive use of chemicals. Integrated pest management is currently employed to monitor and control pest populations, but it relies on labor-intensive methods with low accuracy. Automating crop monitoring using aerial robotics, such as flapping-wing drones, presents a viable solution. This study explores the application of deep learning algorithms, You Only Look Once (YOLO) and Faster region-based convolutional neural network regions with convolutional neural networks (R-CNN), for pest and disease detection in greenhouse environments. The research involved collecting and annotating a diverse dataset of images and videos of common pests and diseases affecting tomatoes, bell peppers, and cucumbers cultivated in Dutch greenhouses. Data augmentation and image resizing techniques were applied to enhance the dataset. The study compared the performance of YOLO and Faster R-CNN, with YOLO demonstrating superior performance. Testing on data acquired by flapping-wing drones showed that YOLO could detect powdery mildew with accuracy ranging from 0.29 to 0.61 despite the shaking movement induced by the actuation system of the drone’s flapping wings.
DOCUMENT
In November 2019, the High Performance Greenhouse project (HiPerGreen) was nominated for the RAAK Award 2019, as one of the best applied research projects in the Netherlands. This paper discusses the challenges faced, lessons learned and critical factors in making the project into a success.
DOCUMENT
Greenhouses are in need of new monitoring tools, as they size grow bigger and bigger but still using old labour intensive methods ways of caring for the crop. HiPerGreen is set out to create a new tool, which can drive onto the pre-existing heating pipes to provide a birds eye perspective for image analysis purposes. However, clear images are necessary for consistent usable data. This presentation resumes the steps taken during the reporting: the optimisation of a rail based system towards clear images. This is done through analysis of resulting images, understanding vibrations and oscillations, and finally presents results based on prototyping. Moreover, a re-design of the electronics and hardware was also introduce to facilitate prototyping. The results are promising, laying within the requirements.
DOCUMENT
Dit document is één van de twee eindproducten voor de module Green Protorype Platform. In dit deel is te lezen hoe ons proces verlopen is en ook hoe we doelstellingen behaald hebben die vooraf gesteld zijn. Tot slot is een bondige beschrijving te lezen over urban farming. Dit is een samenvatting van het onderzoek dat het eerste blok heeft plaatsgevonden. Aangezien de tijd in het eerste blok voornamelijk gestoken is in research doen, lijkt de productie op het eerste gezicht wat weinig. Het is echter goed om te weten dat het onderzoek uit blok 1 ons ontzettend geholpen heeft om in blok 2 het schetsontwerp te maken. Dit schetsontwerp is ook meteen het tweede eindproduct. Het is een opzichzelfstaand boekje, zodat daar alleen inhoudelijk op eigenschappen van het schetsontwerp ingegaan kan worden. Als bijlage bij dit procesdocument is het artikel toegevoegd dat we samen hebben geschreven voor het vak Lezingencarrousel. Dit artikel gaat nog dieper in op de kenmerken van urban farming, en kan dan ook gelezen worden als een toevoeging aan dit document. Het is niet geschreven voor het GPP, maar kan wel van waarde zijn voor het platform. Het onderzoek dat we gedaan hebben in blok 1 voor het GPP, heeft deels bijgedragen aan het tot stand komen van het artikel.
DOCUMENT
Uit het vooronderzoekvan het project Duurzamelearning communities: Oogstenin de Greenportblijkt dat12 factorenhierbijvan belangrijk zijn. Deze succesfactoren staan centraal in de interactieve tool Seeds of Innovation. Ook komen uit het vooronderzoek, aangevuld met inzichten uit de literatuur en tips om de samenwerking door te ontwikkelen en meer gebruik te maken van de opbrengsten 12 succesfactoren met toelichting, belangrijkste bevindingen en tips voor ‘hoe nu verder’, Poster, Walk through, De app die learning communities helptde samenwerkingnaareenhogerplan te tillenen innovatieveopbrengstenoptimaalte benutten.
MULTIFILE
