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 525418
Title Het proefveldonderzoek bij de rijstcultuur op Java
Author(s) Ossewaarde, J.G.
Source University. Promotor(en): J.E. van der Stok; M.J. van Uven. - Wageningen : Veenman - 180
Publication type Dissertation, internally prepared
Publication year 1931
Keyword(s) rijst - oryza sativa - proefvelden - indonesië - java - voorzieningen - nederlands indië - rice - experimental plots - indonesia - facilities - netherlands east indies
Categories Rice
Abstract A historical review was given of the development of rice cultivation in Java, of the influence of the Netherlands colonial government on the agricultural methods by advice before and after local research, and of the development of field trial techniques and the organization of systematic research. The principle of randomization was not applied at that time. Tests of significance were made by comparing a given difference with three times its estimated standard deviation. To reduce standard deviation the elimination of a linear trend in fertility for different places was discussed in detail. From the results of field experiments between 1911 and 1926 the relation between expected yield and the standard deviation was studied for different soil types and only the data were used of trials, where fertility of the area was even enough to be chosen as the place for a trial. This relation seemed to be reasonably linear. Attention was paid to the power of a test in relation to standard deviation. In the period considered investigators were more concerned with lack of bias in estimators than their efficiency. In this thesis the importance of efficiency is stressed and more insight is given into the possibilities offered by field experiments.
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