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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Record number 428084
Title Optimal design of experiments on nematode dynamics and crop yield
Author(s) Berg, W. van den; Grasman, J.; Rossing, W.A.H.
Source Nematology 14 (2012)7. - ISSN 1388-5545 - p. 773 - 786.
Department(s) Team Schimmels, Onkruiden en Plagen
Biometris (WU MAT)
Biological Farming Systems
PE&RC
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) potato cyst nematodes - population - rotations
Abstract Experimental design theory provides tools to estimate parameters of nematode dynamics and yield loss functions with the highest accuracy given the available budget for the experiment. Variables in models, which take the role of predictors, are given values and a weight so that the best result is obtained. As a side result the prediction of the response will have a minimal variance. We introduce the concept of D-optimum design and consider in our models two response variables: the nematode density at the end of the season and the crop yield. Both variables depend on the same predictor, the initial nematode density. D-optimum design applies to linear regression models. For models that are nonlinear in the parameters, as is the case in this study, a linearisation at a given point in a parameter plane is used. When the initial nematode density at the experimental units is known prior to experimentation, one may optimally allocate the treatments to the units by selecting the combination that has the highest efficiency
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