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.
Light of various spectral regions (at low or high intensities) supplemented a short day (SD) in white light, or was used alone at high intensity. Two types of relation of wave length to photoperiodic reaction were found: Crucifers were sensitive to blue and infrared (even SD exposure promoted elongation and flowering) and did not respond to 520-700 mμ(so this region inhibited flowering in white light despite its blue component); other plants, e.g. Cosmos bipinnatus and Spinacia oleracea were sensitive to 520-700 mμand showed little or no response to blue and infrared. Flowering of day-neutral plants was not affected by wave length of supplementary light.All species showed strong response to supplementary blue and infrared radiation, by excessive elongation of a part such as internodes, leaves or petioles. The rate depended on light intensity and the process was inhibited by red or green. Light of restricted spectral regions also induced strong formative and biochemical effects. Infrared counteracted red light. 'Monochromatic' light of high intensity perhaps regulated auxin level, whereas the supplementary light might effect its activity or sensitivity to auxin.
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