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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    Groundwater-based agriculture in arid land : the case of Azraq Basin, Jordan
    Naber, Majd Al - \ 2018
    Wageningen University. Promotor(en): J. van Wallinga; F. Molle, co-promotor(en): J.J. Stoorvogel. - Wageningen : Wageningen University - ISBN 9789463437394 - 208

    With limitations in the availability and accessibility of surface water, attention is increasingly directed towards groundwater resources as the most reliable source of fresh water for different sectors. Accordingly, groundwater is over abstracted in many countries of the world. The overexploitation of groundwater renewable and non-renewable aquifers for both urban use and irrigation results in a drop of the water table and, frequently, in a reduction in groundwater quality. This study focuses on the use of groundwater for irrigation purposes in desert areas of the MENA region. The thesis contributes to conserving and sustaining the use of limited groundwater resources in desert agriculture, by analyzing the current unsustainable use of groundwater, focusing on groundwater policy on the one hand, and on the specificities of desert agriculture on the other, with a focus on Azraq basin in Jordan.

    Water and sand: Is groundwater-based farming in Jordan's desert sustainable?
    Naber, Majd Al; Molle, Francois - \ 2017
    Groundwater for Sustainable Development 5 (2017). - ISSN 2352-801X - p. 28 - 37.
    Azraq - Desert agriculture - Farming systems - Groundwater overexploitation - Irrigation - Jordan

    Irrigated agriculture in Jordan's highlands relies on overexploited groundwater. Drops in water tables and water quality, but also tougher policy measures by the government, threaten the sustainability of this activity which has long thrived on lax law enforcement and cheap desert land. This paper is based on field work in two locations of Azraq groundwater basin [around the Azraq oasis and in the northern part (Mafraq)], and first presents farm typologies which show the variability of farm gross margins and the contrast between the two zones. While Mafraq stands for capital-intensive fruit-tree cultivation on legal land/wells, Azraq's agriculture is largely based on olive cultivation and wells that are either illegal or granted permits with higher block tariffs, and has a return that is only one tenth of Mafraq's. The paper reviews the constraints and changes in land, energy, water, labor and input costs and reflects on their bearing on current dynamics and future prospects. While Mafraq is found to be largely immune to policy changes and resilient to foreseeable changes in factor prices or markets, Azraq's future is threatened by various vulnerabilities, including salinization of groundwater, rising energy and labor costs that, in the long run, are likely to be overcome only by farmers emulating the Mafraq intensification model, or accepting temporary losses in the hope of a future legalization of land and wells. Solar energy now emerges as a trump card, in particular for illegal farms which, on the other hand, are challenged by recent tough water pricing regulations that are shown to make them unprofitable. The government's resolve in enforcing these regulation is put to test and will largely decide the future of Azraq's agriculture.

    Controlling groundwater over abstraction : State policies vs local practices in the Jordan highlands
    Naber, Majd Al; Molle, Francois - \ 2017
    Water Policy 19 (2017)4. - ISSN 1366-7017 - p. 692 - 708.
    Azraq - Groundwater management - Jordan - Over abstraction - Water governance - Water policy
    The control of groundwater over abstraction is a vexing problem worldwide. Jordan is one of the countries facing severe water scarcity which has implemented a wide range of measures and policies over the past 20 years. While the gap between formal legal and policy frameworks and local practices on the ground is widely acknowledged, few studies investigate how local users react to state regulations and document their tactics to circumvent them. This paper examines the major tools implemented by the Jordanian government to control well expansion and water abstraction and how farmers in the Azraq basin have responded to these measures. It then documents how, in response, the Ministry of Water and Irrigation has recently enacted a series of creative counter-measures, both direct and indirect, in an attempt to toughen law enforcement and raise pressure over groundwater users. The lessons learned are highly relevant for countries with similar situations, both in the region and elsewhere.
    The politics of accessing desert land in Jordan
    Naber, Majd Al; Molle, Francois - \ 2016
    Land Use Policy 59 (2016). - ISSN 0264-8377 - p. 492 - 503.
    Azraq - Desert reclamation - Jordan - Land tenure - Legal pluralism - Tribal politics

    With the dramatic increase of the population in Jordan, the value of land has rocketed up. Urban sprawl into semi-desert or desert areas, initially not surveyed or settled by the British and considered as state land, has brought to the surface the problematic status of those lands. Likewise, the profitability of irrigated agriculture based on groundwater has generated a demand for land in the Mafraq, Zarqa and Amman governorates. These trends have spurred tensions between local tribes and the state. This study focuses on land tenure and conflicts in the semi-desert and desert areas of Jordan, with a focus on the expansion of irrigated agriculture within the Azraq basin. It is based on field work and interviews with different stakeholders at various levels. We first provide a summary of the main historical developments regarding land tenure in Jordan, with a focus on the status of semi-desert and desert land. We move on to examining the different ways by which state land can be privatized and then review instances of conflicts around rights to desert land in the past 30 years, further taking the Azraq water basin as a case study to shed light on the particular case of groundwater-based agricultural expansion. We then articulate our discussion through the lens of legal pluralism, look at the interplay between state and tribal power, and analyze the twin strategies of accessing land and water in desert areas. We conclude by showing the historical continuity of the land tenure relationships, while singling out Jordan's state land management regime.

    Food matrix effects on bioaccessibility of B-Carotene can be measured in a vitro gastrointestinal model
    Loo-Bouwman, C.A. van; Naber, T.H.J. ; Minekus, M. ; Hulshof, P.J.M. ; Schaafsma, G. - \ 2014
    Journal of Agricultural and Food Chemistry 62 (2014)4. - ISSN 0021-8561 - p. 950 - 955.
    green leafy vegetables - digestion method - pro-vitamin - folic-acid - accessibility - serum - bioavailability - absorption - retinol - cassava
    Since the food matrix determines ß-carotene availability for intestinal absorption, food matrix effects on the bioaccessibility of ß-carotene from two diets were investigated in vitro and compared with in vivo data. The “mixed diet” consisted of ß-carotene-rich vegetables, and the “oil diet” contained ß-carotene-low vegetables with supplemental ß-carotene. The application of extrinsically labeled ß-carotene was also investigated. The bioaccessibility of ß-carotene was 28 µg/100 µg ß-carotene from the mixed diet and 53 µg/100 µg ß-carotene from the oil diet. This ratio of 1.9:1 was consistent with in vivo data, where the apparent absorption was 1.9-fold higher in the oil diet than in the mixed diet. The labeled ß-carotene was not equally distributed over time. In conclusion, the food matrix effects on bioaccessibility of ß-carotene could be measured using an in vitro model and were consistent with in vivo data. The application of extrinsically labeled ß-carotene was not confirmed.
    Kennisinventarisatie Sclerotinia problematiek : inventarisatie bestaande kennis m.b.t. Sclerotinia in het bouwplan
    Wander, J.G.N. ; Russchen, H.J. ; Schepers, H.T.A.M. ; Lamers, J.G. ; Eldering, P. ; Hamont, J. van; Naber, R. ; Remijn, J. ; Rongen, J. ; Velde, A. van der - \ 2011
    Lelystad : PPO AGV - 62
    aardappelen - akkerbouw - gewasbescherming - schimmelziekten - sclerotinia - bodemschimmels - nederland - belgië - literatuuroverzichten - potatoes - arable farming - plant protection - fungal diseases - sclerotinia - soil fungi - netherlands - belgium - literature reviews
    In veel gewassen is het voorkomen of bestrijden van een aantasting door de bodemgebonden schimmelziekte Sclerotinia een toenemend probleem. Door DLV Plant en PPO AGV Lelystad is een deskstudie uitgevoerd in opdracht van de Productschappen Tuinbouw en Akkerbouw om de problematiek verder in beeld te brengen en kennis omtrent oplossingsrichtingen te inventariseren. De jaarlijkse schadepost voor telers wordt geschat op ongeveer 10 miljoen euro. Er zijn in potentie veel maatregelen die de ziekte beheersbaar kunnen maken, zoals bijvoorbeeld het mechanisch bestrijden van de Sclerotinia. Bij het kiezen van de juiste aanpak is het voor een teler van belang om te weten of besmetting vooral uit het eigen perceel komt of dat sporen die aan komen waaien een grote infectiedruk leveren.
    Vitamin A equivalency and apparent absorption of ß-carotene in ileostomy subjects using a dual-isotope dilution technique
    Bouwman, C.A. ; Naber, T.H.J. ; Breemen, R.B. van; Zhu, D. ; Dicke, H. ; Siebelink, E. ; Hulshof, P.J.M. ; Russel, F.G.M. ; Schaafsma, G. ; West, C.E. - \ 2010
    The British journal of nutrition 103 (2010)12. - ISSN 0007-1145 - p. 1836 - 1843.
    mass-spectrometry - bioavailability - retinol - humans - volunteers - adults - bioefficacy - spinach - carrots - meals
    The objective was to quantify the vitamin A equivalency of ß-carotene in two diets using a dual-isotope dilution technique and the apparent ß-carotene absorption as measured by the oral–faecal balance technique. Seventeen healthy adults with an ileostomy completed the 4-week diet-controlled, cross-over intervention study. Each subject followed both diets for 2 weeks: a diet containing vegetables low in ß-carotene content with supplemental ß-carotene in salad dressing oil (‘oil diet’; mean ß-carotene intake 3·1 mg/d) and a diet containing vegetables and fruits high in ß-carotene content (‘mixed diet’; mean ß-carotene intake 7·6 mg/d). Daily each subject consumed a mean of 190 µg [13C10]ß-carotene and 195 µg [13C10]retinyl palmitate in oil capsules. The vitamin A equivalency of ß-carotene was calculated as the dose-corrected ratio of [13C5]retinol to [13C10]retinol in serum. Apparent absorption of ß-carotene was determined with oral–faecal balance. Isotopic data quantified a vitamin A equivalency of [13C10]ß-carotene in oil of 3·6:1 (95 % CI 2·8, 4·6) regardless of dietary matrices differences. The apparent absorption of (labelled and dietary) ß-carotene from the ‘oil diet’ (30 %) was 1·9-fold higher than from the ‘mixed diet’ (16 %). This extrinsic labelling technique can measure precisely the vitamin A equivalency of ß-carotene in oil capsules, but it does not represent the effect of different dietary matrices
    Vitamin A equivalency of ß-carotene in healthy adults: limitation of the extrinsic dual-isotope dilution technique to measure matrix effect
    Bouwman, C.A. ; West, C.E. ; Breemen, R.B. van; Zhu, D. ; Siebelink, E. ; Versloot, P. ; Hulshof, P.J.M. ; Lieshout, M. van; Russel, F.G.M. ; Schaafsma, G. ; Naber, T.H.J. - \ 2009
    The British journal of nutrition 101 (2009)12. - ISSN 0007-1145 - p. 1837 - 1845.
    mass-spectrometry - leafy vegetables - dark-green - bioavailability - retinol - humans - bioconversion - serum - consumption - spinach
    Data on the vitamin A equivalency of ß-carotene in food are inconsistent. We quantified the vitamin A equivalency (¿g) of ß-carotene in two diets using the dual-isotope dilution technique and the oral¿faecal balance technique. A diet-controlled, cross-over intervention study was conducted in twenty-four healthy adults. Each subject followed two diets for 3 weeks each: a diet containing vegetables low in ß-carotene with supplemental ß-carotene in salad dressing oil ('oil diet') and a diet containing vegetables and fruits high in ß-carotene ('mixed diet'). During all 6 weeks, each subject daily consumed a mean of 55 (sd 0·5) ¿g [13C10]ß-carotene and 55 (sd 0·5) ¿g [13C10]retinyl palmitate in oil capsules. The vitamin A equivalency of ß-carotene was calculated as the dose-corrected ratio of [13C5]retinol to [13C10]retinol in serum and from apparent absorption by oral-faecal balance. Isotopic data quantified a vitamin A equivalency of [13C10]ß-carotene in oil of 3·4 ¿g (95 % CI 2·8, 3·9), thus the bio-efficacy of the ß-carotene in oil was 28 % in the presence of both diets. However, data from oral-faecal balance estimated vitamin A equivalency as 6:1 ¿g (95 % CI 4, 7) for ß-carotene in the 'oil diet'. ß-Carotene in the 'oil diet' had 2·9-fold higher vitamin A equivalency than ß-carotene in the 'mixed diet'. In conclusion, this extrinsic labelling technique cannot measure effects of mixed vegetables and fruits matrices, but can measure precisely the vitamin A equivalency of the ß-carotene in oil capsules
    Uneven feet limit performance of a warmblood horse population
    Gorissen, B.M.C. ; Ducro, B.J. ; Tartwijk, H. van; Naber, G. ; Eldik, P. van; Back, W. - \ 2006
    European Journal of Epidemiology 21 (2006)suppl. 13. - ISSN 0393-2990 - p. 40 - 40.
    Warmblood horses scored by the jury as having uneven feet will never pass yearly selection sales of the Royal Dutch Warmblood Studbook (KWPN).To evaluate whether the undesired trait ‘uneven feet’ influences performance, databases of KWPN (n = 62234 horses) and KNHS (n = 16015 show jumpers, n = 24269 dressage horses) were linked through the unique number of each registered horse. Using a Proc GLM model of SAS was investigated whether uneven feet had effects on age at first start and highest performance level. Elite show jumpers with uneven feet start at 7.2 years and dressage horses 9.4 years of age, which is a significant difference (p
    Wij willen smaaklessen : voorstel voor de implementatie van het programma Smaaklessen in het basisonderwijs
    Vrijhof, C.T. ; Meester, H.J. ; Naber, P.M. - \ 2005
    Utrecht : InnovatieNetwerk Groene Ruimte en Agrocluster (Rapport / InnovatieNetwerk Groene Ruimte en Agrocluster : Serie achtergrondrapporten ) - ISBN 9789050592857 - 57
    smaak - voedselvoorkeuren - voedingseducatie - scholen - primair onderwijs - lesmaterialen - innovaties - smaaklessen - taste - food preferences - nutrition education - schools - primary education - teaching materials - innovations - tasting lessons
    Smaaklessen© is zinnenprikkelend, speels en praktisch onderwijs over voeding en voedsel voor jongeren. Door het proeven, ruiken, voelen, zien en horen – ofwel het ervaren van eten –leren jongeren dat eten leuk en interessant is.
    Vitamin A equivalency of beta-carotene in oil in healthy Dutch adults measured using specifically 13C-labeled beta-carotene and retinol
    Bouwman, C.A. ; West, C.E. ; Breemen, R.B. van; Zhu, D. ; Lieshout, M. van; Siebelink, E. ; Versloot, P. ; Naber, A.H.J. - \ 2004
    - 1 p.
    Bioavailability and bioefficacy in healthy Dutch adults of Beta-carotene in mixed diet and in oil measured using specifically 13C-labelled beta-carotene and retinol.
    Bouwman, C.A. ; West, C.E. ; Breemen, R.B. van; Zhu, D. ; Lieshout, M. van; Siebelink, E. ; Versloot, P. ; Naber, A.H.J. - \ 2004
    Verspreiding van akkerdistel vanuit Krammer-Volkerak. Deskundigenbericht - in opdracht van de Arrondissementsrechtbank te Amsterdam derde enkelvoudige kamer bij vonnis d.d. 14 november 2001
    Struik, P.C. ; Wenum, J.H. ; Naber, H. - \ 2003
    Wageningen : S.n. - 39 p.
    Expertisecentrum voor arbeidsomstandigheden in de agrarische sector
    Oude Vrielink, H.H.E. - \ 2001
    In: Agro-praktica agenda 2001 / van Dongen, E., Schulpen, N.,
    Teelttechnologie en Ketens: uw partner voor technologische vooruitgang in de aardappelketen
    Lokhorst, C. - \ 2001
    In: Agro-praktica agenda 2001 / van Dongen, E., Schulpen, N.,
    Parenteral structured triglyceride emulsion improves nitrogen balance and is cleared faster from the blood in moderately catabolic patients
    Kruimel, J. ; Naber, A.H.J. ; Vliet, J.A. van der; Carneheim, C. ; Katan, M.B. ; Jansen, J.B.M.J. - \ 2001
    Journal of Parenteral and Enteral Nutrition 25 (2001). - ISSN 0148-6071 - p. 237 - 244.
    The effects of nonylphenol and estradiol on larval development of Rana temporaria tadpoles
    Poorte, J. de; Naber, A.B. ; Stumpel, A.H.P. ; Bosveld, A.T.C. - \ 2000
    In: RIKZ/NIOB/M&T symposium endocrine disrupting compounds: wildlife and human health effects, 27 October, The Hague, 1998 - p. 10 - 10.
    The effects of nonylphenol on Rana temporaria tadpole survival, development and longitudinal growth
    Poorte, J. de; Naber, A.B. ; Stumpel, A.H.P. ; Bosveld, A.T.C. - \ 2000
    In: Endocrine-disrupting compounds: wildlife and human health risks : proceedings of a symposium 27 October 1998, The Hague / Vethaak, A.D., Rijksinstituut voor Kust en Zee - ISBN 9789036934046 - p. 137 - 141.
    amphibia - rana temporaria - oestrogenen - fenolen - overleving - amfibieën - ecotoxicologie - endocrinologie - fauna - herpetologie - kikkers - milieuverontreiniging - oestrogens - phenols - survival
    Morphological, phenological and water-use dynamics of sorghum varieties (Sorghum bicolor) under Striga hermonthica infestation
    Gebremedhim, W. ; Goudriaan, J. ; Naber, H. - \ 2000
    Crop Protection 19 (2000). - ISSN 0261-2194 - p. 61 - 68.
    De unieke collectie kaarten van Alterra beschikbaar op Internet
    Naber, G. ; Slijkhuis, H. - \ 2000
    Kartografisch tijdschrift 26 (2000)4. - ISSN 0167-5788 - p. 21 - 23.
    bodem - landschap - hydrologie - cartografie - databanken - nederland - vegetatie - ecologie - internet - soil - landscape - hydrology - vegetation - ecology - mapping - databases - netherlands
    Alterra, Research Instituut voor Groene Ruimte, beschikt over een grote collectie analoge kaarten van bodem, grondwater, geomorfologie, historische geografie, landschap, vegetatie en ecologie van delen van Nederland. Alterra en Bibliotheek Wageningen UR hebben de kaartbeschrijvingen op Internet beschikbaar gemaakt en voorzien van een gebruiksvriendelijke zoekstructuur. De originele kaarten kunnen na het zoekproces on-line worden opgevraagd bij bibliotheek ‘De Haaff’. Een volgende wens is om de originele kaarten on-line op Internet te kunnen bekijken. Een marktverkenning heeft aangetoond dat er veel belangstelling is voor kaartenbestanden, vooral als deze voorzien zijn van on-line oproepbare kaartbeelden. Er wordt contact gezocht met andere bezitters van kaartcollecties om na te gaan of er samengewerkt kan worden.
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