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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 104655
Title Die Nichtaustauschbare Festlegung des Kalis im Boden
show extra info.
door G.F. Hauser
Author(s) Hauser, G.F.
Publisher Wageningen : Veenman
Publication year 1941
Description 172 p
Notes Proefschrift Wageningen
Tutors Hudig, Prof. Ir. J.
Graduation date 1941-10-23
Dissertation no. 117
Author abstract show abstract
Types of bonds between K and soil constituents were summarized with published data; Volk's remineralization model and a model of Gorbunov were rejected. Experimental results suggested that an equilibrium existed between exchangeable and unexchangeable K. Only soils with an inorganic colloid fraction could fix K in an unexchangeable form.

Fixation capacity was correlated with clay percentage.

Differences between river clay and marine clay were clarified by content of minerals low in K and by the influence of naturally occurring humic substances. Micaceous earth was especially K fixing while humic substances did not fix potassium but increased the capacity of minerals to fix K.

Distortion of the humic film by oxidation or a pH shift lowered the fixation capacity of soils. Adding artificial humic substances to soil did not restore fixation capacity but lowered it by blocking access to the grid.

Field trials showed that prolonged K consumption without replenishment enlarged the K-fixing capacity. On K-fixing soils, heavy K dressings had a transient effect, so a K dressing in autumn was purposeless. Fixation of K was so strong that even under heavy K dressings, there was no leaching of K.

Online full textINTERNET
On paper FORUM ; STACKS ; NN08202,117
Keyword(s) (cab) soil / potassium / absorption / adsorption
Categories Soil Fertility / Fertilizers, Fertilizer Application
Publication type PhD thesis
Language German
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