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.
Photoperiodism was studied in 417 rice varieties of which 28, selected by differences in photoperiodic response, were studied in more detail. The plants were usually grown under 16 different photoperiods ranging from 5 to 24 h. In detailed experiments the types of response to short and long days were studied and each developmental stage of the plant from germination until grain maturation was examined separately. Particular attention was given to the juvenile phase, photoperiodic induction, reproductive development, varietal classification, and the construction of response curves. Response was plotted as time from sowing to floral initiation on the ordinate against photoperiod used on the abscissa. These curves gave much information on photoperiodic response of the varieties used.Much detailed work was devoted to specific light effects such as: the perception of the photoperiod, the effects of alternating, increasing and decreasing photoperiods, light intensities, wave-length dependence, interrupted light and dark periods. The experimental data were used to interpret the photoperiodic response of rice plants grown in natural daylengths. Seasonal changes in cloudiness (monsoons) shortened twilight and daylength, thereby markedly affecting the time of flowering in very sensitive varieties.
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