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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 104663
Title Een statistisch onderzoek naar den invloed van het weer op de opbrengst en het gehalte van suikerbieten in Nederland
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door Hindrik Jacobus Frankena
Author(s) Frankena, H.J.
Publisher Groningen : Noordhoff
Publication year 1932
Description 173 p
Notes Proefschrift Wageningen
Tutors Gulik, Prof. Dr. D. van
Graduation date 1932-06-15
Dissertation no. 64
Author abstract show abstract
Correlation coefficients were calculated to examine the relation over the period 1899-1926 between beet yield and sugar content, and rainfall, sunshine and temperature. For every decade and combinations of two or more decades of the period March-October, the correlation coefficient was calculated. The interrelations between the three elements were also considered. The main purpose was to find critical periods as a basis for forecasting yield.

There were two critical periods for yield. The sowing period (20 April-20 May) had to be dry. The correlation coefficient with the rainfall was -0.66 ± 0. 11. The month of July had to be warm and bright. (Correlation coefficient for temperature + 0.60 ± 0,12 and for hours of sunshine + 0.66 ± 0.11.)

Sugar content was stimulated by a bright dry autumn. Correlation coefficients were for hours of sunshine +0.61±0.12 and for rainfall -0.72 ± 0.09.

The main cropping districts Zeeland and Groningen differed strikingly in the correlation coefficient for temperature in August: for Zeeland (south of the Netherlands) +0.27 ± 0.17 and for Groningen (north of the Netherlands) +0.62 ± 0.12.

The main regression equation for beet yield was X = M + 761x 2 - 75x 3 . M average yield (kg/ha), x 2 = departure from average temperature (°C) during the last 20 days of July and x 3 = departure from average rainfall (mm) during the period 20 April to 20 May.

Online full textINTERNET
On paper FORUM ; SPEC.COLL. ; C2231
FORUM ; STACKS ; NN08202,64
Keyword(s) (cab) yield increases / yield losses / yields / beta vulgaris / sugarbeet / meteorological factors / wind / statistical analysis / statistical data / netherlands
Categories Sugarbeet
Publication type PhD thesis
Language Dutch; Flemish
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