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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 104213
Title De invloed der bemesting op het carotine- en vitamine C-gehalte van de plant
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door J.B.H. IJdo
Author(s) IJdo, J.B.H.
Publisher Utrecht : Schotanus & Jens
Publication year 1936
Description VIII, 122 p
Notes Proefschrift Wageningen
Tutors Grijns, Prof. Dr. G.
Graduation date 1936-06-05
Dissertation no. 96
Author abstract show abstract
For practical reasons Spinacia oleracea was chosen for these pot experiments in a greenhouse. For the quantitative estimation of carotene, a short method was developed. The vitamin C content of leaves decreased rapidly at room temperature and even at ice-box temperature, so analysis had to be rapid (titration with 2,6- dichlorophenolindophenol in acid medium).

The pots contained pure washed quartz sand or an exactly analysed sandy soil, and were supplied with Krnger's nutrient solution.

Increasing the N supply increased the carotene and vitamin C content. Increasing K supply decreased carotene content, but increased vitamin C content. But decrease in carotene content was only obvious in plants grown with little N. The increase of vitamin C content was usually most distinct in plants grown with much N, although it was fairly clear in the whole combined experiment. The influence of P, Ca and Mg salts was small.

A final section attempts to interpret the data to demonstrate a relation between chlorophyll and carotene. Ascorbic acid was considered to be a product of photo- synthesis. This could explain the peculiar course of carotene and vitamin C contents with K fertilizers. K deficiency acted as a N excess, while K excess acted as N deficiency.

Online full textINTERNET
On paper FORUM ; SPEC.COLL. ; A2096,1936,7
FORUM ; STACKS ; NN08202,96
Keyword(s) (cab) plant nutrition / fertilizers / manures / carotenes / provitamins / carotenoids / chemical composition / plants / chemical analysis / exposure / environmental degradation / kinetics / metabolism / ecotoxicology
Categories Fertilizers, Fertilizer Application
Publication type PhD thesis
Language Dutch; Flemish
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