Library Catalogue

Library Catalogue

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    Union Catalogue of Agricultural Libraries in the Netherlands

    The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.

    Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.

    The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.

    As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".

    All titles are entered in their original language. Keywords are added to facilitate subject searching.

    The database is updated every day and now contains over 830.000 records.

Record number 104289
Title Wiskundige beschouwingen bij eenige hoofdstukken uit de philosophie der landbouwwetenschap
show extra info.
door J.P. Sijpkens
Author(s) Sijpkens, J.P.
Publisher Wageningen : [s.n.]
Publication year 1945
Description 137 p.
Notes Proefschrift Wageningen
Tutors Uven, Prof. Dr. M.J. van ; Stok, Prof. J.E. van der
Graduation date 1945-12-10
Dissertation no. 130
Author abstract show abstract
Because of the many factors involved in agricultural problems experimental methods could not be based on ceteris paribus, as in other natural sciences, but required factorial trials with simultaneous variation of many factors. A complete factorial experiment was unworkable in practice because of the large area required but trial size could be reduced by ignoring interactions of higher order.

Interactions of higher order sometimes cancelled out main effects and interactions of lower order. To avoid this undesirable effect, analogous functions called 'main action' and 'interplay' were introduced. The trial could be reduced to a smaller size by splitting the complete factorial experiment into partexperiments of factorial form for a small number of factors. Various possibilities were studied, including the replication of some treatments in different experiments to adjust results. Replicates were needed also to estimate variances and to compare these with interactions. Thus the estimation of variance from interaction terms could be avoided.

Online full textINTERNET
On paper FORUM ; STACKS ; 524E08
Keyword(s) (cab) agriculture / philosophy / mathematics
Categories Agriculture (General)
Publication type PhD thesis
Language Dutch; Flemish
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