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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    Is there life after hype for Jatropha? Exploring growth and yield in Indonesia
    Tjeuw, Juliana - \ 2017
    Wageningen University. Promotor(en): K.E. Giller; M. van Noordwijk, co-promotor(en): M.A. Slingerland. - Wageningen : Wageningen University - ISBN 9789463431927 - 223
    fuel crops - jatropha curcas - crop yield - new crops - feasibility studies - indonesia - cultural methods - cultivation - disincentives - biobased economy - cropping systems - intercropping - brandstofgewassen - jatropha curcas - gewasopbrengst - nieuwe cultuurgewassen - haalbaarheidsstudies - indonesië - cultuurmethoden - teelt - belemmeringen - biobased economy - teeltsystemen - tussenteelt

    Jatropha curcas L. is a biofuel crop that has not lived up to expectations due to a combination of hype and disappointment and biophysical factors. This PhD thesis is based on the plant production component of the JARAK programme which aimed to bridge the gap between truth and fiction. This study reviewed the jatropha hype and disappointment and further investigated the hypothesis that jatropha growth and yield are limited by biophysical factors of plant characteristics, cropping systems, and management. My review of the hype and disappointment shows that despite the high expectations fuelled by market pull and technology push, and numerous actors, the commercial potential for jatropha is limited by policy and governance, economics, social, technology, logistical, and environmental. A study of the biophysical components confirms that no current varieties suited to different cropping systems and locations are available. Jatropha aboveground biomass is partitioned predominantly into a structure of stem, branches, and twigs. The below to aboveground biomass ratio was 0.5 and fruit which was found only on productive twigs accounted for the smallest portion of biomass measured. Seed yields were disappointingly small (109 kg ha-1) and were largest in monoculture, followed by intercropping and hedgerows in that order, although yields were influenced by age and management of pruning and fertiliser. Seed yield across the three cropping systems can be predicted using plant height and the number of productive twig/branch, although the number of inflorescence clusters per productive twig may be important. Intercropping between jatropha and maize (Zea mays L.) resulted in competition for resources both belowground and aboveground that reduced maize yields. Shoot pruning was effective in managing aboveground competition, while root pruning and root barriers effectively managed competition belowground. Leaf prunings provided a limited, but positive fertility effect on maize yield comparable to 21 kg N ha-1. Jatropha - maize intercropping has potential for long-term productivity provided management practices such as fertiliser, pruning, and planting density can be developed to minimise competition and enhance complementarity. Based on my review of the jatropha hype and disappointment and my biophysical research results, the planting of jatropha by smallholders, or as a plantation crop cannot be recommended. Once the issues I highlight have been resolved and market confidence restored, jatropha may finally become a commercial source of biodiesel able to provide improved socio-economic and environmental benefits.

    Certificering binnen de biobased economy: van belemmering naar kans voor innovatief MKB
    Bos, H.L. ; Butter, J. - \ 2014
    Wageningen : Wageningen UR - Food & Biobased Research (FBR report 1491) - ISBN 9789462570573 - 22
    certificering - biobased economy - economische ontwikkeling - belemmeringen - duurzaamheid (sustainability) - nederland - overheidsbeleid - certification - biobased economy - economic development - disincentives - sustainability - netherlands - government policy
    De ontwikkeling van de biobased economy (BbE) in Nederland begint steeds meer op gang te komen. Grote en kleine bedrijven brengen innovatieve biobased producten op de markt. In het kader van het programma Botsende Belangen BbE is in 2011 door Sira Consulting een studie uitgevoerd naar belemmeringen die BbE ondernemers ondervinden bij het op de markt brengen van hun producten.1,2 Het hieruit resulterende rapport brengt certificering in relatie tot duurzaamheid naar voren als een fundamentele belemmering, dat wil zeggen een belemmering waarvoor geldt dat het wegnemen ervan meer complexe aanpassingen vraagt. In het voorliggende onderzoek is daarom dieper ingegaan op de aard van deze belemmering en is gezamenlijk met verschillende stakeholders gezocht naar manieren om de belemmering te verminderen.
    Succes en falen van regionale projecten in de Biobased Economy. Deel A: Advies, Deel B: Achtergrondrapport
    Hees, E. van; Elbersen, H.W. ; Quist-Wessel, P.M.F. ; Vlaar, L. - \ 2013
    Wageningen : Wageningen UR Food & Biobased Products
    regionale economie - regionale ontwikkeling - biobased economy - economische ontwikkeling - agrarische economie - belemmeringen - consultancy - overheidsbeleid - regional economics - regional development - economic development - agricultural economics - disincentives - government policy
    Voor u ligt een rapport over regionale initiatieven in Nederland in de Biobased Economy, over hun betekenis en over hun succes- en faalfactoren. De vraag was met name wat in de praktijk de knelpunten blijken te zijn voor de realisering van deze initiatieven. Dit rapport bestaat uit twee delen. Deel A is een advies van het Platform aan het Ministerie van Economische Zaken. Dit advies is grotendeels gebaseerd op de in het onderzoek verworven inzichten, en verder op gesprekken die sindsdien door leden van het platform zijn gevoerd. Deel B is het achtergrondrapport van Wageningen UR en CLM Onderzoek en Advies.
    Implementation of access and benefit sharing policies in Sub-Sahara Africa: inventory, analysis and proposals
    Brink, M. - \ 2013
    Ministerie van EL&I - 47
    genetische bronnen van plantensoorten - wetgeving - regelingen - belemmeringen - germplasm uitwisseling - afrika ten zuiden van de sahara - Nederland - plant genetic resources - legislation - regulations - disincentives - germplasm exchange - africa south of sahara - Netherlands
    Today, individuals, companies and institutes seeking access to genetic resources have to comply with rules and regulations set by national governments, based to a varying extent on the international agreements mentioned above. As each country is following its own interpretations and procedures, this has led to a complex situation, and sometimes even a feeling that in some countries it is not worth the effort anymore to seek access to genetic resources. Therefore, a project was initiated in 2012 to make an inventory of Access and Benefit-Sharing regulations and their implementation in selected countries in Sub-Sahara Africa, to analyse shortcomings and identify options for improvement, while at the same time establishing a discussion platform between and with policy makers in Sub-Sahara Africa and contributing to trust building between African countries and the Netherlands as the basis for substantial improvements in the exchange of germplasm and the fair and equitable benefit-sharing between the parties involved.
    Bijvangsten van salmoniden en overige trekvissen vanuit een populatieperspectief
    Jansen, H.M. ; Winter, H.V. ; Tulp, I.Y.M. ; Bult, T.P. ; Hal, R. van; Bosveld, J. ; Vonk, R. - \ 2008
    IJmuiden : IMARES (Rapport / Wageningen IMARES C039/08) - 175
    zalm - salmonidae - visserij - populatie-aanwas - herstel - belemmeringen - bijvangst - salmon - salmonidae - fisheries - recruitment - rehabilitation - disincentives - bycatch
    De huidige studie gaat in op de vraag of de huidige visserijinspanning door bijvangsten het herstel van de zalmpopulatie in de weg staat. De voorliggende rapportage geeft een overzicht van een inventarisatie van bijvangsten van salmoniden en overige trekvissen in zowel de commerciële als de recreatieve visserij in de Nederlandse wateren. Visserijsterfte en overige sterftefactoren worden vervolgens afgezet tegen een populatieschatting waardoor de relatieve impact van visserij in perspectief geplaatst kan worden.
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