Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Feasibility study thin glasses for greenhouse roof designs
Hemming, Silke ; Mohammadkhani, Vida ; Kempkes, Frank ; Peters, Anton ; Lieffrig, Vincent ; Harada, Keitaro ; Spronsen, Michiel van; Werff, Tjibbe van der; Louter, Christian - \ 2018
Bleiswijk : Wageningen University & Research, BU Greenhouse Horticulture (Wageningen University & Research, BU Greenhouse Horticulture report WPR-732) - 50
In this study, the feasibility of the application of flexible thin glass in greenhouses was investigated. With the development of thin but very strong glass plates like for mobile phones, new possibilities are being created for new greenhouse roof designs, the usage in multi-layered glass roof give possibilities for high-insulation greenhouse coverings. Flexible thin glass is a tempered glass. While standard tempered glass goes through a thermal process, this is a chemical process, which makes the glass five times stronger, creating the possibility of thickness reduction and bending. By adding nanocoatings the reflection can be reduced and the light transmission can be increased. Multi-layered greenhouse roofs can be created, resulting in a higher light transmission than currently available multilayer polycarbonate (PC) sheets, but also a higher transmission than today’s insulating double glass. The study shows that such glass combinations lead to an additional 20% energy savings based on heat demand for Phalaenopsis. Thin glasses are particularly strong and can also be used in curved form. This makes new greenhouse roof designs with these glasses possible. Especially the low weight offers advantages here. Important mechanical aspects and bottlenecks for the use in greenhouses have been mapped out. Due to limitations in today’s available dimensions and high prices, the use of thin glass in greenhouses will be further away in the future
De Uitstralingsmonitor
Zwart, Feije de; Baeza, Esteban ; Breugel, Bram van; Mohammadkhani, Vida ; Janssen, Hans - \ 2017
Bleiswijk : Wageningen University & Research, BU Glastuinbouw (Rapport GTB 1449) - 50
Intensive use of screens is an important part of what’s called the ‘Next Generation Greenhouse Cultivation’. It offers great potential for energy saving and gives a much more homogeneous temperature distribution in the crop. Especially the temperature at the top of the crop will be closer to the air temperature, and therefore the risk of condensation will decrease. To illustrate these effects, a calculation model has been developed that shows the effect of screens on the temperature distribution in the crop. The work on this model has been funded by the horticultural supply industry, united in the ‘Club van 100’, and through the research program ‘Kas Als Energiebron’. This research program is a cooperation between the Ministry of Economic Affairs and LTO-Glaskracht Nederland. The vertical temperature distribution in the crop is strongly influenced by the longwave radiation and therefore model has been named the ‘Radiation Monitor’. Comparison of the calculated values with measurements in a greenhouse shows that the model accurately calculates the net radiation from the crop and nicely predicts the vertical temperature distribution. Especially the effect of the screen application is convincingly simulated.
Energy saving screen materials : measurement method of radiation exchange, air permeability and humidity transport and a calculation method for energy saving
Hemming, Silke ; Baeza Romero, Esteban ; Mohammadkhani, Vida ; Breugel, Bram van - \ 2017
Bleiswijk : Wageningen University & Research, BU Greenhouse Horticulture (Report GTB 1431) - 92
The objectives of the project were the quantifi cation of the greenhouse screen properties (emissivity and transmissivity for thermal infrared radiation, air permeability and humidity transport) and the determination of the total energy saving under defi ned conditions in order to be able to compare the performance of different screens (and suppliers) with each other. This helps growers to understand more about screen properties and allows them to make an informed choice of investment. The results show that impermeable screens and screens with low emissivity and low transmissivity for thermal infrared radiation give highest energy saving. Permeable screens give highest transport for humidity and lowest air humidity during screen usage without the need for additional mechanical dehumidifi cation.
Género y toma de decisiones en el hogar en pueblos rurales de Laos : implicancias para los medios de vida en desarrollo hidroeléctrico
Weeratunge, Nireka ; Joffre, Olivier ; Senaratna Sellamuttu, Sonali ; Bouahom, Bounthanom ; Keophoxay, Anousith - \ 2016
Gender, Place & Culture : a Journal of Feminist Geography 23 (2016)11. - ISSN 0966-369X - p. 1599 - 1614.
decision-making - Gender - households - hydropower development - Lao PDR - livelihoods

Hydropower development with concomitant changes in water and land regimes often results in livelihood transformation of affected people, entailing changes in intra-household decision-making upon which livelihood strategies are based. Economic factors underlying gender dimensions of household decision-making have been studied rigorously since the 1970s. However, empirical data on gender and decision-making within households, needed for evidence-based action, remain scarce. This is more so in hydropower contexts. This article explores gender and livelihood-related decision-making within rural households in the context of hydropower development in Lao PDR. Based on a social well-being conceptual approach with data from a household survey and qualitative interviews, it focuses on household decisions in an ethnic minority resettlement site soon after displacement, from an interpretive perspective. The article, first, aims to assess the extent to which household decision-making is gendered and secondly, to understand the complex reasoning behind household decisions, especially the relevance of material, relational, and subjective factors. It argues that while most household decisions are ostensibly considered as ‘joint’ in the study site, the nuanced nature of gendered values, norms, practices, relations, attitudes, and feelings underlying these decisions are important to assessing why households might or might not adopt livelihood interventions proposed by hydropower developers.

Comparison of phenotyping methods for resistance to stem rot and aggregated sheath spot in rice
Rosas, Juan E. ; Martínez, Sebastián ; Bonnecarrère, Victoria ; Pérez de Vida, Fernando ; Blanco, Pedro ; Malosetti Zunin, Marcos ; Jannink, Jean Luc ; Gutiérrez, Lucía - \ 2016
Crop Science 56 (2016)4. - ISSN 0011-183X - p. 1619 - 1627.

Stem and sheath diseases caused by Sclerotium oryzae Cattaneo (SCL) and Rhizoctonia oryzae-sativae Sawada Mordue (ROS) can severely reduce rice (Oryza sativa L.) yield and grain quality. Genetic resistance is the best strategy to control them. Phenotypic selection for resistance is hampered due to a heterogeneous distribution of the inoculum in the soil that generates high environmental variability and decreases genetic gain. To have higher selection accuracy it is necessary to develop phenotyping methods with high repeatability and discriminative power. Comparison of greenhouse methods have been reported for Rhizoctonia solani Kühn, a more invasive pathogen than SCL and ROS, and for SCL, but no such comparisons are reported for ROS. Our study compares five inoculation methods for SCL and ROS to identify the more discriminant and repeatable method and to apply it for high-throughput phenotyping of hundreds of rice lines. A method that uses an agar disc with growing mycelium attached to the base of stems was found to have the best balance between discrimination among genotypes and variability among replicates of the same genotype for both pathogens. This method was used in five greenhouse experiments for phenotyping resistance to SCL and ROS in a population of 641 rice advanced breeding lines. Heritabilities of resistance ranged from 0.36 to 0.71 in these experiments. These findings have a direct application in screening for resistance of rice to SCL and ROS, and in high-throughput phenotyping for mapping loci associated to disease resistance.

Vegetation of a Polylepis incarum forest (Rosaceae) in Lampa district, Puno, Peru : Vegetación de un bosque de Polylepis incarum (Rosaceae) en el distrito de Lampa, Puno, Perú
Montesinos, D.B. ; Pinto, A. ; Farfán, D.F.B. ; Galiano, Y.W. - \ 2015
Revista Peruana de Biología 22 (2015)1. - ISSN 1561-0837 - p. 87 - 96.
Se estudió la vegetación de los bosques de Polylepis incarum (Bitter) M. Kessler & Schmidt-Lebuhn en el anexo de Lamparaquen, en la provincia de Lampa, departamento de Puno en los años 2009 y 2014. Se determinaron 83 especies vasculares pertenecientes a 35 familias. En cuanto a las formas de vida, dominan las herbáceas, gramíneas, arbustos y árboles, siendo en su mayoría, nativas e endémicas, algunas introducidas. Se identificó el ecosistema queñoal representado por la nueva unidad fitosociológica Lupino chlorolepis-Polylepidetum incari con cuatro subasociaciones respectivamente. La composición florística demuestra una riqueza moderada-alta de especies, siendo las familias con mayor representatividad, Asteraceae, Poaceae, Caryophyllaceae, Fabaceae y Pteridaceae. Se aplicó el método fitosociológico de Braun-Blanquet para el análisis de unidades vegetativas. Se presenta la clasificación de comunidades mediante el software TWINSPAN, el análisis de ordinación DCA con el software CANOCO 4.5 y un dendrograma basado en correlación de especies para cada cuadrante efectuado con el software PC-ORD. Mayores estudios son aún necesarios para tener una visión más amplia de las comunidades de plantas en otras zonas geográficas, y evaluar como la vegetación puede verse afectadas con el cambio climático y acciones antrópicas.
Modernidad, exclusión y resistencia: el agua y las luchas indígenas en el valle del Colca, Perú
Zwarteveen, M.Z. ; Vera Delgado, J.R. - \ 2013
In: Agua e inequidad: Discursos, políticas y medios de vída en la región andina / Hoogesteger van Dijk, J.D., Urteaga, P., Lima : IEP/Justicia Hídrica (Agua y Sociedad 18) - ISBN 9789972514159 - p. 165 - 180.
Organización supracomunal, derechos de agua y acción colectiva en luchas por la seguridad hídrica: el caso de Cangahua en los Andes Ecuatorianos
Hoogesteger van Dijk, J.D. - \ 2013
In: Agua e inequidad: Discursos, políticas y medios de vída en la región andina / Hoogesteger van Dijk, J.D., Urteaga, P., Lima : IEP/Justicia Hídrica (Agua y Sociedad 18) - ISBN 9789972514159 - p. 95 - 115.
Reformas hídricas y la dominación de la pluralidad legal
Boelens, R.A. - \ 2013
In: Agua e inequidad: Discursos, políticas y medios de vída en la región andina / Hoogesteger van Dijk, J.D., Urteaga, P., Lima : IEP (Agua y Sociedad 18) - ISBN 9789972514159 - p. 53 - 66.
Nuevas escalas de acción: Organizaciones y seguridad hídrica en los Andes
Hoogesteger van Dijk, J.D. ; Manosalvas, R. ; Sosa Landeo, M. ; Verzijl, A. - \ 2013
In: Agua e inequidad: Discursos, políticas y medios de vída en la región andina / Hoogesteger van Dijk, J.D., Urteaga, P., Lima : IEP/Justicia Hídrica (Agua y Sociedad 18) - ISBN 9789972514159 - p. 21 - 43.
Introducción: disputas por agua en los países andinos
Hoogesteger van Dijk, J.D. ; Urteaga, P. - \ 2013
In: Agua e inequidad: Discursos, políticas y medios de vída en la región andina / Hoogesteger van Dijk, J.D., Urteaga, P., Lima : IEP/Justicia Hídrica (Agua y Sociedad 18) - ISBN 9789972514159 - p. 11 - 20.
Conclusiones: Hacia una gestión sustentable y democrática del agua
Urteaga, P. ; Hoogesteger van Dijk, J.D. - \ 2013
In: Agua e inequidad: Discursos, políticas y medios de vída en la región andina / Hoogesteger van Dijk, J.D., Urteaga, P., Lima, Peru : IEP/Justicia Hídrica (Agua y Sociedad 18) - ISBN 9789972514159 - p. 181 - 193.
El cambio climático desde la perspectiva de la justicia social
Zwarteveen, M.Z. - \ 2013
In: Agua e inequidad: Discursos, políticas y medios de vida en la región andina / Hoogesteger van Dijk, J.D., Urteaga, P., Lima : IEP/Justicia Hídrica (Agua y Sociedad 18) - ISBN 9789972514159 - p. 45 - 51.
Agua e inequidad: Discursos, políticas y medios de vída en la región andina
Hoogesteger van Dijk, J.D. ; Urteaga, P. - \ 2013
Lima : IEP (Justicia Hídrica 3) - ISBN 9789972514159 - 200
waterbeheer - governance - andes - water management
Diversidad Florística de la cuenca alta del rio Tambo-Ichuña, Moquegua, Perú
Montesinos, D.B. - \ 2011
Revista Peruana de Biología 18 (2011)1. - ISSN 1561-0837 - p. 119 - 132.
La diversidad florística de plantas vasculares es estudiada en la cuenca del río Tambo-Ichuña, la puna y bofedales altoandinos en los distritos de Ichuña, Ubinas y Yunga (3400 – 4700 m de altitud), provincia General Sánchez Cerro, departamento de Moquegua, Perú. La flora vascular de esta región está integrada por 70 familias, 238 géneros y 404 especies. Las Magnoliopsida representan el 78% de las especies, las Liliopsida 16%, Pteridófitos 6% y Gimnospermas 0,5%. Se han identificado diez formas (biológicas) de vida, siendo los hemicriptófitos las más numerosas; y tres formaciones vegetales, constituyendo el matorral subhúmedo el más diverso. Entre especies endémicas, 42 taxones son exclusivos para Perú. Son adicionados 272 especies a la flora del departamento de Moquegua.
Emisiones de gases de efecto invernadero de la carne de cordero en España a lo largo de su ciclo de vida: Una comparación de tres sistemas productivos
Boer, Imke de - \ 2011
Emisiones de gases de efecto invernadero de la carne de cordero en España a lo largo de su ciclo de vida: Una comparación de tres sistemas productivos.
Ripoll-Bosch, R. ; Boer, I.J.M. de; Bernues, A. ; Vellinga, Th.V. - \ 2011
In: Proceedings of the AIDA, XIV Jornadas sobre producción animal, 17-18 mayo 2011, Zaragoza, Spain. - - p. 121 - 123.
Desarrollo de diferentes estrategias para aumentar la seguridad y la vida util en productos de carne de cordero a lo largo de la cadena alimentaria
Gomez, S.M.O. - \ 2010
Universidad de Burgos. Promotor(en): Pieternel Luning, co-promotor(en): J. Rovira Carballido. -
Nieuwe materialen stellen hogere eisen aan meting lichtdoorlatendheid (interview met Vida Mohammadkhani en Gert-Jan Swinkels)
Kierkels, T. ; Mohammadkhani, V. ; Swinkels, G.L.A.M. - \ 2010
Onder Glas 7 (2010)5. - p. 40 - 41.
kassen - bekleding, bouw - materialen - kunststoffen - glas - lichtdoorlating - meting - instrumenten (meters) - landbouwkundig onderzoek - glastuinbouw - greenhouses - cladding - materials - plastics - glass - light transmission - measurement - instruments - agricultural research - greenhouse horticulture
Er worden steeds nieuwe kasdekmaterialen ontwikkeld. De lichtdoorlatendheid daarvan is niet zomaar met oude apparatuur te meten, vooral omdat diffuus invallend licht en lichtverstrooiing door het materiaal tegenwoordig ook belangrijk zijn. Wageningen UR Glastuinbouw heeft daarom nieuwe meetapparatuur ontwikkeld, die loodrecht én diffuus invallend licht en haze van vrijwel elk kasdekmateriaal kan meten. DLV Glas & Energie dringt erop aan de nieuwe meetmogelijkheden in de NEN-normering op te nemen.
Experiencias y alternativas en la estrucuración del riego campesino en los Andes ecuatorianos. El riego: 'de o para campesinos'?
Hoogesteger van Dijk, J.D. ; Solís Carrión, H.E. - \ 2008
In: Derecho que no se defiende, derecho que se pierde: Seis estudios sobre el trabajo en medios de vida sostenibles / Palau, X., Intermón Oxfam - ISBN 9788484525288 - p. 119 - 164.
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