Zero liquid discharge in soilless greenhouse horticulture : Solutions to save water and the environment while ensuring an optimal production
Os, E.A. Van; Beerling, E.A.M. ; Blok, C. ; Leyh, R. ; Ruijven, J.P.M. Van; Staaij, M. Van Der; Janse, J. ; Kaarsemaker, R. ; Roosen, W. - \ 2020
Acta Horticulturae 1273 (2020). - ISSN 0567-7572 - p. 129 - 135.
Circular economy - Cucumber - Emission - Nitrate - Nitrogen - Pesticides - Plant protection product - Sweet pepper
Zero liquid discharge (ZLD) should be the future for soilless production. In The Netherlands emission of nutrients and plant protection products to surface water is the main reason to investigate the potentials of cultivation methods without any discharge. In a few other countries water pollution issues is the main motive, but for a majority water shortage and the increasing competition for water of an acceptable quality is reason for the growing need for water efficient cultivation methods. During four years ZLD was investigated for cucumber (2014, 2017) and sweet pepper (2015, 2016). The primary goal was to reuse all drain water, while maintaining a similar yield and quality as in the traditional growing method with regular discharges. To achieve ZLD all practical reasons for growers to discharge the nutrient solution had to be anticipated before. In the ZLD trials technical and strategic solutions were jointly tested and further developed into an adapted growing strategy without any discharge. A number of factors could be mentioned as main reasons for discharge: sodium in the supply water, discharge of filter rinsing water, unbalances in the nutrient solution, no recirculation of the drainwater in the beginning of the cultivation, no disinfection equipment, too low drain storage capacity, appearance of calamities (technical failures) and the amount of remnant nutrient solution left in slabs and tanks at the end of the cultivation. The next step was demonstrating the technical and strategic solutions in a cultivation. In 2014 and 2015 we showed that ZLD-cultivation in stone wool substrate was possible without loss of yield and quality. In 2016 and 2017 the more challenging coir substrate was used to investigate the influence of buffering and sodium accumulation. It appeared that ZLD was possible without loss of production or quality. Appearing problems were more in the field of management of water flows than lack of technical equipment. Special care should come for technical failures of equipment, mostly not enough storage capacity is available.
Explaining attention and choice for origin labeled cheese by means of consumer ethnocentrism
Loo, Ellen J. Van; Grebitus, Carola ; Roosen, Jutta - \ 2019
Food Quality and Preference 78 (2019). - ISSN 0950-3293
Biodegradable packaging - Complex decision-making - Eye-tracking - Growth hormone labeling - rBST - Visual attention
This study examines the relationship between consumer ethnocentrism, visual attention and choice for origin labeled cheese. It evaluates the impact of consumer ethnocentrism on preferences for domestic products, as well as, on the visual attention paid to the origin labeling during the decision-making. Using a choice experiment, this study investigates US respondents’ preferences for product attributes of cheddar cheese including country of origin (US, Mexico, Ireland), region of origin, hormone use, biodegradable packaging, and price. It provides empirical evidence that the level of consumer ethnocentrism among US consumers influences the preference for US labelled cheese and the visual attention to origin labeling. Specifically, higher consumer ethnocentrism leads to a higher preference for US cheese as compared to Irish cheese. Further, the study reveals that the level of consumer ethnocentrism affects visual attention paid to origin labeling. However, this is only the case in less complex decision situations, when there is little information on other product attributes.
On the Measurement of Consumer Preferences and Food Choice Behavior: The Relation Between Visual Attention and Choices
Loo, Ellen J. Van; Grebitus, Carola ; Nayga, Rodolfo M. ; Verbeke, Wim ; Roosen, Jutta - \ 2018
Applied Economic Perspectives and Policy 40 (2018)4. - ISSN 2040-5790 - p. 538 - 562.
Choice - cues - eye tracking - information - labeling - visual attention
When buying a product, consumers are confronted with a host of information presented to them. However, this information can only affect shoppers’ choices if they pay attention to it. Eye tracking can measure visual attention to information. Most recently, agricultural and food economics research has combined eye tracking and valuation methods to give insight into the relation between visual attention, preferences, and choices. We present an overview of the eye-tracking literature, and discuss theory and applications. Also, insights on how to measure visual attention and choice are provided. While eye tracking has its challenges, there are interesting future research avenues that can be explored by agricultural and food economists using eye tracking.
Water efficiënte emissieloze kas : resultaten paprika (steenwol - kokos) 2016
Os, E.A. van; Ruijven, J.P.M. van; Staaij, M. van der; Janse, J. ; Blok, C. ; Leyh, Romain ; Beerling, E.A.M. ; Faasse, Rinus ; Haan, Cees de; Kaarsemaker, Ruud ; Hempenius, Eelke ; Roosen, Wim ; Jong, Gerben de; Lugt, Bert van der; Bustamante Garcia, Marco - \ 2016
Eating behavior, personality traits and body mass in women
Strien, T. van; Frijters, J.E.R. ; Roosen, R.G.M.F. ; Knuiman-Hijl, W.J.H. ; Defares, P.B. - \ 1985
Addictive behaviors 10 (1985). - ISSN 0306-4603 - p. 333 - 343.
|Obesity in young adults: A mixed longitudinal study
Baecke, J.A.H. ; Burema, J. ; Deurenberg, P. ; Frijters, J.E.R. ; Hautvast, J.G.A.J. ; Rookus, M.A. ; Roosen, R.G.M.F. ; Staveren, W.A. van; Strien, T. van - \ 1983
In: Abstracts Communication 4th European Nutrition Conference, Amsterdam, 1983, 166
|Eetgedrag en (over)gewicht
Frijters, J.E.R. ; Roosen, R.G.M.F. - \ 1981
In: Afwijkend eetgedrag / Menges, L.J., - p. 24 - 56.
|Obesitas in psychologisch perspectief
Frijters, J.E.R. ; Roosen, R.G.M.F. - \ 1980
Hart Bulletin 11 (1980). - ISSN 0301-8202 - p. 42 - 48.