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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    Flexibiliteit als oplossing voor rioleringsvraagstukken
    Leutscher, T. ; Zandvoort, M. ; Vlist, M.J. van der - \ 2017
    Vakblad Riolering 23 (2017)3. - ISSN 1380-8613 - p. 14 - 16.
    Modelling operational adaptations of tactical production plans on pot plant nurseries: a simulation approach
    Leutscher, K.J. ; Renkema, J.A. ; Challa, H. - \ 1999
    Agricultural Systems 59 (1999). - ISSN 0308-521X - p. 67 - 78.
    Endoscoopdesinfectie met glutaaraldehyde: vergelijking van blootstelling bij oude en moderne desinfectie-apparatuur.
    Leutscher, M. ; Amersfoort, C. van; Kromhout, H. ; Heederik, D. - \ 1998
    Tijdschrift voor Hygiene en Infectiepreventie 17 (1998). - p. 176 - 179.
    Vergelijking van blootstelling bij oude en moderne desinfectie-apparatuur.
    Leutscher, M. ; Amersfoort, C. van; Kromhout, H. ; Heederik, D. - \ 1997
    Tijdschr Toegepaste Arbowetenschappen 10 (1997). - p. 46 - 50.
    The family-firm life cycle as a tool in assessing regional development of horticulture
    Niejenhuis, J.H. van; Verstappen, C.D.G. ; Leutscher, K.J. - \ 1996
    In: Proceedings Vill International Symposium On Horticulture Economics, USA, July - p. 393 - 400.
    Options for greenhouse production system management; analysis and simulation.
    Leutscher, K.J. ; Renkema, J.A. ; Challa, H. - \ 1996
    In: Farmers in a small-scale and large-scale farming in a new perspective: objectives, decision making and information requirements / Beers, G., - p. 305 - 315.
    Aids in Afrika: rampspoed en aanzet tot sociale veranderingen. (Aids in Africa: disastrous and generating social change)
    Bos, F. ; Leutscher, M. ; Niehof, A. - \ 1996
    Medische Antropologie 8 (1996). - ISSN 0925-4374 - p. 169 - 184.
    Evaluation of tomato cultivation strategies: uncertainty analysis using simulation.
    Leutscher, K.J. ; Heuvelink, E. ; Merwe, R.A. van de; Bosch, P.C. van den - \ 1996
    In: Proc. 6th Int. Congr. for Computer Technology in Agriculture (ICCTA). Wageningen, The Netherlands - p. 492 - 497.
    The family-firm life cycle as a tool in assessing regional development of horticulture.
    Niejenhuis, J.H. van; Verstappen, C.D.G. ; Leutscher, K.J. - \ 1996
    Acta Horticulturae 429 (1996). - ISSN 0567-7572 - p. 393 - 400.
    The last two years' average financial results in Dutch horticulture have been rather negative. In many regions authorities are concerned about the future of horticulture in their region and wonder how they could have a positive effect on the development of horticulture firms. Therefore, they need good insight into the actual position of the horticultural holdings and the perception of the entrepreneurs of their own situation. The possibilities to use the family-firm life cycle as a tool to develop this insight are analyzed. An inquiry was carried out among 52 horticultural family firms in a small region in the eastern part of the Netherlands. The stage of the firm in the cycle was chosen by the pollster based on her expertise from visiting all the firms and the results of the inquiry as to the age of the youngest entrepreneur, past investments, and investments plans. The distribution of holdings in different stages of the life cycle provided good insight into the position of different branches of horticulture in the investigated region and in the goals of the entrepreneurs. The use of the family firm life cycle was a suitable way to obtain quick insight into the situation and expected developments in the short run in a small region. Points for further research are the assessment of a stage to a firm and a distinction between family and firm life cycle.
    Operational management in pot plant production
    Leutscher, K.J. - \ 1995
    Agricultural University. Promotor(en): H. Challa; J.A. Renkema. - S.l. : Leutscher - ISBN 9789054854470 - 285
    potplanten - monitoring - productie - planning - agrarische bedrijfsvoering - agrarische bedrijfsplanning - computersimulatie - simulatie - simulatiemodellen - schefflera arboricola - binnen kweken (van planten) - pot plants - monitoring - production - planning - farm management - farm planning - computer simulation - simulation - simulation models - schefflera arboricola - indoor culture

    Operational management in pot plant production was investigated by means of system analysis and simulation. A theoretical framework for operational decision-making consisted of elaboration decisions, progress decisions, and adoption decisions. This framework was incorporated in a pot plant nursery model, which simulated the implementation of a given tactical production plan under uncertainty. In this model, crop growth as well as price formation (of the foliage plant Schefflera arboricola 'Compacta') were affected by randomly simulated exogenous conditions, which resulted in plant sizes and plant prices deviating from planning premises. Operational decision-making related to the adaptation of cultivation-schedules (and delivery patterns) in order to restore compatibility between plan and reality.

    Regression metamodelling was applied to analyze simulations results with respect to differences in annual net farm income due to operational decision-making, tactical planning, price variability, and the grower's attitude to operational price risk. All differences could be explained by individual decision events triggered by the strategy of operational management applied in the particular simulation.

    In conclusion, the applied methodology was successful in exploring the opportunities for operational management in pot plant production based on a rather normative approach and integrating theory from various scientific disciplines. Furthermore, simulation experimentation showed significant impact of operational management on the nursery's performance. Hence, the present study indicates several opportunities for beneficial support of operational management on pot plant nurseries.

    An architecture and modelling framework for intelligent planning systems.
    Beulens, A.J.M. ; Dongen, R.S. van; Leutscher, K.J. ; Hartog, R.J.M. - \ 1995
    In: Proc. 17th IFIP TC7 Conf. on System modeling and optimization, J. Dolezal, J. Fidler (eds.). UTIA, Prague - p. 410 - 413.
    Modeling with objects and constraints: production planning in horticulture.
    Hartog, R.J.M. ; Dongen, R.S. van; Leutscher, K.J. ; Beulens, A.J.M. - \ 1995
    In: Proc. 2nd IFAC/IFIP/EurAgEng Workshop on Artificial intelligence in agriculture, A.J. Udink ten Cate et al. (eds.). Wageningen. Elsevier Sci. Ltd., Oxford - p. 173 - 178.
    Operational decision-making under uncertainty in pot plant production: analysis and simulation.
    Leutscher, K.J. - \ 1995
    In: Mathematical modelling and simulation in agriculture and bio-industries, ULB, Belgium (1995) III.B1 - p. 1 - 6.
    Branding of horticultural products: an application to pot plants.
    Koelemeijer, K. ; Leutscher, K.J. ; Stroeken, J.J.G. - \ 1994
    Acta Horticulturae 340 (1994). - ISSN 0567-7572 - p. 325 - 332.
    Modelling in the search for balance between inputs and outputs in greenhouse cultivation.
    Challa, H. ; Heuvelink, E. ; Leutscher, K.J. - \ 1994
    In: Plant production on the threshold of a new century, P.C. Struik et al. (eds.). Kluwer Acad. Publ., Dordrecht - p. 187 - 195.
    Effect of type of cutting on heterogenity and growth of Rosa hybrida cv 'Motrea' and Schefflera arboricola cv. 'Compacta'.
    Marcelis-van Acker, C.A.M. ; Leutscher, K.J. - \ 1993
    Scientia Horticulturae 54 (1993)1. - ISSN 0304-4238 - p. 59 - 67.
    cut flowers - cuttings - growth - pot plants - propagation - indoor culture
    TOMIS: Tactical operational management information system.
    Leutscher, K.J. - \ 1992
    In: Abstract 12th. Int. Symp. Horticultural economics (1992)
    The economic effect of aversion to risk during tactical planning in pot plant production.
    Leutscher, K.J. - \ 1991
    Acta Horticulturae 295 (1991). - ISSN 0567-7572 - p. 203 - 207.
    Two risk avers strategies are applied during tactical planning in pot plant production. Production risk should be reduced by an extra optional week added to the cultivation-schedule and price risk should be reduced by a staggered selling-schedule. However, the effect of these risk avers strategies after a simulated implementation of tactical plans is limited. The first strategy results in a lower financial result. And with respect to the second strategy no significant difference can be proved. Therefore other approaches should be developed and attention should be directed to operational management. Futhermore, the present study shows the relation between the financial result and the efficiency of space utilization.
    Tuinbouw en voedselvoorziening.
    Challa, H. ; Leutscher, K.J. - \ 1991
    In: Risico's in de Sovjetunie; Nederlandse betrokkenheid bij de economische hervorming
    A crop growth simulation model for operational management support in pot plant production.
    Leutscher, K.J. ; Vogelezang, J.V.M. - \ 1990
    Agricultural Systems 33 (1990)2. - ISSN 0308-521X - p. 101 - 114.
    The elaboration of a crop growth model for pot plant production which takes account of the physiological processes controlling growth and yet is suitable for management purposes is described. The parameters of the model are specified for Schefflera arboricola cv. Compacta using previously published data. An example is given to demonstrate the application of the model and the value and potential of the model are discussed.
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