Library Catalogue

Library Catalogue

  • external user (warningwarning)
  • Log in as
  • About the Catalogue

    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 104390
Title Fijnheid en verdeeling van een als meststof toegediend natuurlijk fosfaat
show extra info.
door G.H.A. Leijenaar
Author(s) Leijenaar, G.H.A.
Publisher Wageningen : Veenman
Publication year 1932
Description 113 p
Notes Proefschrift Wageningen
Tutors Hudig, Prof. Ir. J.
Graduation date 1932-07-01
Dissertation no. 67
Author abstract show abstract
This study was to examine whether grinding of an insoluble fertilizer to different degrees of fineness produced a limit below which further grinding did not accelerate solution of the particles. Such a limit was indeed found. Below 30 mmu* the distribution of the particles became very uneven because individual particles tended increasingly to stick together. Mixing fine particles with coarser ones could improve the situation, but the percentage of coarse particles should not be too high.

Grinding natural phosphates to colloidal fineness was useless, since the colloidal state was lost during drying of the product. The smaller particles tended to aggregate thus preventing uniform distribution throughout the soil.

The availability of P in natural phosphates improved with the physiologically acid reaction of N fertilizers such as NH 4 HCO 3 and NH 4 NO 3 . A first requirement for rapid absorption of P from natural phosphates was a low concentration of Ca 2+ .

Online full textINTERNET
On paper FORUM ; SPEC.COLL. ; B1294
FORUM ; SPEC.COLL. ; A2096,1932,7
FORUM ; STACKS ; NN08202,67
Keyword(s) (cab) rock phosphate / phosphorus / soil / fertilizers / composition / research / trials
Categories Soil Fertility / Fertilizers, Fertilizer Application
Publication type PhD thesis
Language Dutch; Flemish
There are no comments yet. You can post the first one!
Post a comment

To support researchers to publish their research Open Access, deals have been negotiated with various publishers. Depending on the deal, a discount is provided for the author on the Article Processing Charges that need to be paid by the author to publish an article Open Access. A discount of 100% means that (after approval) the author does not have to pay Article Processing Charges.

For the approval of an Open Access deal for an article, the corresponding author of this article must be affiliated with Wageningen University & Research.

Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.