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 104303
Title Zwavelzure-ammoniak-proeven in de Java-suikerindustrie en een methode tot bepaling van het optimum in deze proeven
show extra info.
door C.B. van Straaten van Nes
Author(s) Straaten van Nes, C.B. van
Publisher Amsterdam : Scheltema & Holkema
Publication year 1947
Description 86 p tab
Notes Proefschrift Wageningen
Tutors Uven, Prof. Dr. M.J. van ; Stok, Prof. J.E. van der
Graduation date 1947-04-18
Dissertation no. 140
Author abstract show abstract
Orthogonal polynomials were applied for the estimation of optimal dosage instead of, as formerly, considering only significant differences in yield of pure sugar. Polynomials of second degree fitted the observed cane yields satisfactorily. Very large observed values of the regression coefficients indicated serious disturbance; if so, the yield/rate relation was not well represented by a polynomial.

No simple mathematical function was found to represent the regression of sugar content on fertilizer rate. The correlation between cane yield and sugar percentage was a good measure for judging sugar percentage for a given rate, at least for correlation coefficients within the region -0.8 and 0. Other values pointed to serious aberrations. Large negative values of the regression coefficient of the term of the second degree and small values of that of the third degree corresponded to low correlation. If so, correlation coefficients calculated from the data, ignoring those from the lowest rate, were more useful.

If more than 30% of the cane lodged, the mathematical function was not satisfactory.

Online full textINTERNET
On paper FORUM ; STACKS ; 288B10
FORUM ; STACKS ; NN08202,140
Keyword(s) (cab) plant nutrition / fertilizers / manures / ammonium sulfate / saccharum officinarum / sugarcane / java / reports / indonesia / netherlands east indies
Categories Sugarcane
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.