Library Catalogue

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 104444
Title De bladrandchlorose van Rhododendron catawbiense "Grandiflorum"
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door W.A. Nieuwdorp
Author(s) Nieuwdorp, W.A.
Publisher Wageningen : Veenman
Publication year 1945
Description 180 p., 19 p. pl
Notes Proefschrift Wageningen
Tutors Hudig, Prof. Ir. J.
Graduation date 1945-10-24
Dissertation no. 128
Author abstract show abstract
Rhododendron catawbiense Grandiflorum, an economically important decorative shrub, suffered from chlorotic leaf symtoms in parts of the Boskoop area.

Two types of symptoms occurred: 1. Yellowish-reddy-green discoloration along the margins and between the primary veins to about-half way along the midrib about July (in transmitted light there were many translucent spots), changing to cadmium-yellow in autumn; 2. Yellow (tissue)-green(veins) marbling of the leaf. Chlorotic leaves had, on average, 44% less chlorophyll than healthy leaves.

Soil acidity was 8 x less for affected than for healthy plants, both soils consisting of clayey peat. The adsorptive complex of bad soils was richer in bases than that of good soils. The higher pH of bad soils resulted from a higher Ca saturation. Above pH 5.1 leaf symptoms arose, abnormal root-hairs formed already at lower pH values. More lime in the soils resulted in higher Ca contents for the plant and lower contents of N, P0 4 , K and Mg. The disease was shown to arise through shortage of N. Despite sufficient acidity too dry a soil also induced the disease. Application of dredgings proved unfavourable (pH about 5.7); a sulphur dressing was favourable (not Al-, Fe-, or Mn-sulphate) for soils with pH>5.1.

Online full textINTERNET
On paper FORUM ; STACKS ; NN08202,128
Keyword(s) (cab) rhododendron / ornamental plants / plant diseases / plant pests / plant protection / plant pathology / plant disorders
Categories Ericales / Ornamental Woody Plants
Publication type PhD thesis
Language Dutch; Flemish
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