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 104222
Title Een onderzoek naar fijnheid en verdeeling van het phosphorzuur en zijn opneembaarheid in de mergelgronden van Java
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door John Thomas White
Author(s) White, J.T.
Publisher Wageningen : Veenman
Publication year 1926
Description 143 p. + 1 losse krt.
Series title Mededeelingen van het Algemeen Proefstation voor de Landbouw (23)
Notes Proefschrift Wageningen
Tutors Aberson, Prof. Dr. J.H.
Graduation date 1926-12-16
Dissertation no. 26
Author abstract show abstract
In 1907 it had been established by Marr and Geerts, that margalitic soils with a content of less than 0.03 % P205 soluble in cold 25 % HC1 or 0.01 % soluble in 2 % citric acid were P deficient. An attempt was therefore made to explain why some soils with P well above this limit responded to superphosphate.

Assuming that the availability of Ca3(PO4)2 depended on its specific surface area, fractions by size were isolated from the soils by Mohr's method of mechanical analysis, and P was estimated in the fractions. P content of the sand fraction was high and decreased with decreasing particle size to a value below the established limits. This contrasted with the rule for soils in temperate climates. Neubauer tests showed that P in the clay fractions was 100 % available, but that of the silt and sand fractions only for 30 %. The distribution of P over the size fractions was especially unfavourable for the margalites rich in P and explained their favourable reaction to P fertilizer.

Online full textINTERNET
On paper FORUM ; SPEC.COLL. ; A2096,1926,5
FORUM ; STACKS ; NN36893,23
FORUM ; STACKS ; NN08202,26
Keyword(s) (cab) soil / phosphoric acid / calcareous soils / clay soils / marl soils / java / indonesia / netherlands east indies
Categories Soil Chemistry
Publication type PhD thesis
Language Dutch; Flemish
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