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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    Burg, W.J. van der - \ 2015
    In: Flore du Gabon / Sosef, M.S.M., Florence, J., Ngok Banak, L., Bourobou Bourobou, H.P., Weikersheim (D), Leiden : Margraf Publishers GmbH, Weikersheim; Backhuys Publishers, Leiden (Vol. 46 ) - ISBN 9783823616979 - p. 53 - 89.
    Seed germination methods for native Caribbean trees and shrubs : with emphasis on species relevant for Bonaire
    Burg, W.J. van der; Freitas, J. ; Debrot, A.O. - \ 2014
    Wageningen : Plant Research International, Business Unit Agrosystems Research (Report / Plant Research International 551) - 60
    zaadkieming - bomen - struiken - zaden - opslag van zaden - zaad verzamelen - kiemrust - bonaire - caribisch gebied - seed germination - trees - shrubs - seeds - seed storage - seed collection - seed dormancy - bonaire - caribbean
    This paper is intended as a basis for nature restoration activities using seeds of trees and (larger) shrubs native to Bonaire with the aim of reforestation. It describes the main seed biology issues relevant for species from this region, to facilitate decisions on time and stage of harvesting, safe storage, breaking dormancy and germinating seeds and planting the young trees in the field. The paper also emphasises that natural process of seedling establishment and succession must be observed in order to be successful. The choice of species and method of protection once planted in nature will prove essential. The paper ends with stressing that such a reforestation activity needs to be planned far ahead: seeds must be collected from tree species taking care of genetic diversity and their storage potential. Recalcitrant seeds (see paper) must be treated carefully and in a different way.
    Key elements towards a Joint Invasive Alien Species Strategy for the Dutch Caribbean
    Smith, S.R. ; Burg, W.J. van der; Debrot, A.O. ; Buurt, G. van; Freitas, J.A. de - \ 2014
    Den Helder, Wageningen : IMARES / PRI (Report / IMARES Wageningen UR C020/14) - 102
    invasieve exoten - zoetwaterecologie - terrestrische ecologie - parasitaire onkruiden - inventarisaties - bonaire - caribisch gebied - invasive alien species - freshwater ecology - terrestrial ecology - parasitic weeds - inventories - bonaire - caribbean
    Recent inventories have documented no less than 211 exotic alien species in the wild for the Dutch Caribbean. These amount to no less than 27 introduced marine species, 65 introduced terrestrial plants, 72 introduced terrestrial and freshwater animals and 47 introduced agricultural pests and diseases. A list of these species, pests and diseases are found in resp. Debrot et al. (2011), Van der Burg et al. 2012, and Van Buurt and Debrot (2012, 2011). The rate of introductions and establishment of invasive alien species (IAS) worldwide has grown rapidly as a result of increasing globalisation. Invasive species cause major ecological effects (decimating native flora or fauna populations) as well as economic losses to these islands, across sectors such as agriculture (diseases, weeds and vectors), fisheries (fish diseases and the lionfish), industry (rodents and termites), tourism (roadside weedy species) and public health (mosquitos). Recently in Curaçao the kissing bug Triatoma infestans was found; this is a vector for Chagas disease. It almost certainly came in with palm leaves imported from South America to be used as roof covering for recreational beach “palapa’s”.
    Mission to Indonesia and Training of Trainers(ToT) workshop on potatoes, Lembang - 5-12 October 2013
    Schepers, H.T.A.M. ; Lotz, L.A.P. ; Burg, W.J. van der - \ 2013
    Wageningen : PPO-PRI - 6 p.
    Burg, W.J. van der - \ 2013
    In: Flore du Gabon / Sosef, M.S.M., Florence, J., Ngok Banak, L., Bourobou Bourobou, H.P., Leiden : Marcgraf Publishers GmbH (Flore du Gabon 45) - ISBN 9783823616467 - p. 45 - 88.
    Performance testing of potato varieties: Performance of several potato varieties in the tropical highlands of West Java: executive summary
    Gunadi, N. ; Wustman, R. ; Burg, W.J. van der; Karjadi, A.K. ; Been, T.H. ; Haverkort, A.J. - \ 2012
    Wageningen UR - 42 p.
    In the framework of the BOCI-project ‘Sustainable potato production in Indonesia’ (BO-10-001-230) trails were performed in West Java. The purpose was to evaluate the agricultural performance and processing quality of 10 varieties, half of which were introduced from the Netherlands by a Dutch seed potato company. The trails were performed by the Indonesian Vegetable Research Institute (IVEGRI) at two locations: the experimental farm of IVEGRI in Lembang (1250 m a.s.l.) and at a farmer’s field in Pangalengan (1300 m a.s.l.). Each trial consisted of three replications in a randomised design and each individual plot contained 50 plants. Agronomic observations were made throughout the growing season; yield was measured using various parameters and the suitability for chips (crisps) and French fries production was established directly after harvest and after two months of storage. The Dutch varieties were of different market types: specific chips varieties, dual purpose varieties (French fry and table) and a French fry variety. The local varieties included local standard Atlantic, a chips variety, Granola which is a table potato and the dominant variety of Indonesia covering an estimated 90 % of the potato growing area. The other varieties were released by IVEGRI or are breeding selections
    Invasieve exoten in Vlaanderen en Nederland : resultaten uit het Invexo-project en aanbevelingen voor verbetering van de exotenaanpak
    Burg, W.J. van der; Lotz, L.A.P. - \ 2012
    Wageningen : Plant Research International - 128
    flora - fauna - schadelijke waterplanten - invasieve soorten - inventarisaties - natuurbeleid - samenwerking - zuid-nederland - vlaanderen - aquatic weeds - invasive species - inventories - nature conservation policy - cooperation - south netherlands - flanders
    De casus-overkoepelende werkgroep „Voorstel Beleid en Samenwerking‟ inventariseerde de mogelijkheden om beleid in de verschillende regio‟s op elkaar af te stemmen en samenwerking te stimuleren. De resultaten van deze werkgroep staan in dit rapport. Invasieve exoten kennen geen grenzen. Daarom is het nodig dat gemeenten, provincies, regio‟s en landen samenwerken om probleemsoorten te bestrijden en te voorkomen. De Europese Unie stimuleert die grensoverschrijdende aanpak van invasieve exoten. 24 partners uit Vlaanderen en Zuid-Nederland deden mee aan het Invexo-project (Europees Interreg-project IV A, 2009-2012). In dit project werden vier probleemsoorten of soortengroepen in Vlaanderen en/of Zuid-Nederland aangepakt: grote waternavel (en ook waterteunisbloem en parelvederkruid), Amerikaanse vogelkers, stierkikker en zomerganzen.
    Naturalised and invasive alien plant species in the Caribbean Netherlands: status, distribution, threats, priorities and recommendations : report of a joint Imares/Carmabi/PRI project financed by the Dutch Ministry of Economic Affairs, Agriculture & Innovation
    Burg, W.J. van der; Freitas, J. de; Debrot, A.O. ; Lotz, L.A.P. - \ 2012
    Wageningen : Plant Research International, Business Unit Agrosystems Research (Report / IMARES Wageningen UR C185/11) - 82
    invasive species - biodiversity - nature conservation - caribbean - invasieve soorten - biodiversiteit - natuurbescherming - caribisch gebied
    Potato Seed Quality Evaluation Trials 2011 - Effect of seed generation derived from different seed sources on the growth and yield of potato in West Java-Indonesia
    Gunadi, N. ; Wustman, R. ; Burg, W.J. van der; Been, T.H. ; Karyadi, A.K. ; Adiyoga, W. ; Sulastrini, I. - \ 2011
    Wageningen : Wageningen UR (PPO/PRI ) - 34
    SUPRO Report 3. Options for rice in vegetable systems in Indonesia. Poverty Alleviation through Sustainable Production (SUPRO)
    Burg, W.J. van der - \ 2011
    Lelystad : PPO AGV - 11 p.
    SUPRO Report 1. Synthesis 2011; Poverty Alleviation through Sustainable Production (SUPRO)
    Adiyoga, W. ; Burg, W.J. van der; Everaarts, A.P. ; Koesveld, M.J. van; Putter, H. de - \ 2011
    Lelystad : PPO AGV - 5 p.
    Farm seed opportunities : conservation, breeding and production
    Kik, C. ; Louwaars, N.P. ; Burg, W.J. van der; Almekinders, C.J.M. - \ 2011
    Wageningen : Wageningen UR, Centre for Genetic Resources - 25
    genetische bronnen van plantensoorten - zaadproductie - vermeerderingsmateriaal - plantenveredeling - genetische diversiteit - conservering - in-situ conservering - plant genetic resources - seed production - propagation materials - plant breeding - genetic diversity - conservation - in situ conservation
    Farm Seed Opportunities (FSO), a research project in the FP6 European Research Framework (2007-2009), was targeted to support the implementation of seed regulations on conservation varieties (directive 98/95/EC and new directives 2008/62/EC and 2009/145/CE) and to propose complementary seed regulation scenarios taking into account the diversity of the European seed systems. The FSO project is a collaborative effort of farmers and scientists from France, Italy, the Netherlands, Spain, Switzerland and the United Kingdom. This publication highlights the main FSO conclusions and presents FSO policy recommendations.
    A three-step teaching experience in Indonesia, or how to transfer your message when you do not speak the students' language
    Burg, W.J. van der; Daryono, D. ; Ettinger, K. van; Yusuf, S.W. - \ 2011
    Seed Testing International 414 (2011)april. - p. 4 - 6.
    Communicating complexity: Integrated assessment of trade-offs concerning soil fertility management within African farming systems to support innovation and development
    Giller, K.E. ; Tittonell, P.A. ; Rufino, M.C. ; Wijk, M.T. van; Zingore, S. ; Mapfumo, P. ; Adjei-Nsiah, S. ; Herrero, M. ; Chikowo, R. ; Corbeels, M. ; Rowe, E.C. ; Baijukya, F.P. ; Mwijage, A. ; Smith, J. ; Yeboah, E. ; Burg, W.J. van der; Sanogo, O. ; Misiko, M. ; Ridder, N. de; Karanja, S. ; Kaizzi, C.K. ; K'ungu, J. ; Mwale, M. ; Nwaga, D. ; Pacini, C. ; Vanlauwe, B. - \ 2011
    Agricultural Systems 104 (2011)2. - ISSN 0308-521X - p. 191 - 203.
    nutrient use efficiencies - crop-livestock systems - western kenya - smallholder farms - land-use - southern mali - cycling efficiencies - exploring diversity - resource-allocation - dynamics
    African farming systems are highly heterogeneous: between agroecological and socioeconomic environments, in the wide variability in farmers’ resource endowments and in farm management. This means that single solutions (or ‘silver bullets’) for improving farm productivity do not exist. Yet to date few approaches to understand constraints and explore options for change have tackled the bewildering complexity of African farming systems. In this paper we describe the Nutrient Use in Animal and Cropping systems – Efficiencies and Scales (NUANCES) framework. NUANCES offers a structured approach to unravel and understand the complexity of African farming to identify what we term ‘best-fit’ technologies – technologies targeted to specific types of farmers and to specific niches within their farms. The NUANCES framework is not ‘just another computer model’! We combine the tools of systems analysis and experimentation, detailed field observations and surveys, incorporate expert knowledge (local knowledge and results of research), generate databases, and apply simulation models to analyse performance of farms, and the impacts of introducing new technologies. We have analysed and described complexity of farming systems, their external drivers and some of the mechanisms that result in (in)efficient use of scarce resources. Studying sites across sub-Saharan Africa has provided insights in the trajectories of change in farming systems in response to population growth, economic conditions and climate variability (cycles of drier and wetter years) and climate change. In regions where human population is dense and land scarce, farm typologies have proven useful to target technologies between farmers of different production objectives and resource endowment (notably in terms of land, labour and capacity for investment). In such regions we could categorise types of fields on the basis of their responsiveness to soil improving technologies along soil fertility gradients, relying on local indicators to differentiate those that may be managed through ‘maintenance fertilization’ from fields that are highly-responsive to fertilizers and fields that require rehabilitation before yields can improved. Where human population pressure on the land is less intense, farm and field types are harder to discern, without clear patterns. Nutrient cycling through livestock is in principle not efficient for increasing food production due to increased nutrient losses, but is attractive for farmers due to the multiple functions of livestock. We identified trade-offs between income generation, soil conservation and community agreements through optimising concurrent objectives at farm and village levels. These examples show that future analyses must focus at farm and farming system level and not at the level of individual fields to achieve appropriate targeting of technologies – both between locations and between farms at any given location. The approach for integrated assessment described here can be used ex ante to explore the potential of best-fit technologies and the ways they can be best combined at farm level. The dynamic and integrated nature of the framework allows the impact of changes in external drivers such as climate change or development policy to be analysed. Fundamental questions for integrated analysis relate to the site-specific knowledge and the simplification of processes required to integrate and move from one level to the next. Keywords: Crop–livestock systems; Soil fertility; Smallholders; Farm types; Simulation modelling
    Effect of hydrogen peroxide spraying on Hydrocotyle ranunculoides L.f. survival. An initial experiment
    Burg, W.J. van der; Michielsen, J.G.P. - \ 2010
    Wageningen : Plant Research International (INVEXO-project ) - 6 p.
    Effect of flaming on Hydrocotyle ranunculoides L.f. survival. An initial experiment
    Burg, W.J. van der; Michielsen, J.G.P. - \ 2010
    Wageningen : Plant Research International (INVEXO-project ) - 8
    onkruidbestrijding - hydrocotyle - invasieve exoten - waterstofperoxide - potproeven - gewasbescherming - weed control - hydrocotyle - invasive alien species - hydrogen peroxide - pot experimentation - plant protection
    The background of this pilot experiment was to find out if treatment in nature with hydrogen peroxide would be feasible as control measure. The experiment was designed to 1. try to raise plants in containers, and 2. to observe the effect of hydrogen spraying on the plants. This would allow to determine the optimal plant growing conditions and to determine a range of doses that could be used in a possible larger experiment. In conclusion it may be say that only the highest concentration of 30% had a marked and direct effect, but still was not enough to kill the plant. The 10% had a clear effect as well but did not kill most of the leaves. The higher concentrations are hazardous to people who will do the spraying, and are therefore not practical. The lower concentrations have little or no effect.
    Short report of the final meeting
    Burg, W.J. van der; Yusuf, S.W. - \ 2010
    Wageningen : Plant Research International (HORTSYS project ) - 11 p.
    The future of the Indonesian vegetable seed sector - Policy recommendations for improved seed availability
    Burg, W.J. van der; Yusuf, S.W. - \ 2010
    Wageningen : Plant Research International (HORTSYS project ) - 26 p.
    Final report
    Burg, W.J. van der; Yusuf, S.W. - \ 2010
    Wageningen : Plant Research International (HORTSYS project ) - 11 p.
    Short evaluation report
    Burg, W.J. van der; Yusuf, S.W. - \ 2010
    Wageningen : Plant Research International (HORTSYS project ) - 3 p.
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