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.
Lengthening of daylight with fluorescent light (intensity 6000 erg/sec/cm 2) from 6 to 24 h for 15 days increased stem length, internode length, number of leaves and leaf size in 16 varieties of cowpea. Four varietal types of growth habit could be distinguished. Experiments on vegetative growth were mainly with varieties whose growth was inhibited in short days (SD) before the onset of flowering (not reversed by subsequent long days (LD)), whereas in LD growth continued for at least 6 to 7 months. The SD stimulus was perceived by the leaves and its effect increased with number of leaves. Preceding LD treatment decreased or nullified sensitivity to SD. The inhibitive effect of SD on stem elongation could partly be overcome by gibberellic acid or dimmer light. In SD a diurnal change of temperature from 30°C during day to 20° at night (less at 15°) favoured stem elongation. It was suggested that in SD growth inhibitors and in LD growth promotors were produced.The cowpea flowered only in SD, except the variety Early Red which showed an ambi-photoperiodic reaction. Photoperiods from 8 to 11 h proved to be optimum to initiate inflorescence. Photoperiodic influences on development and flowering of the inflorescences were also investigated, as well as those of position and removal of leaves. The practical value of the results for growing cowpeas was assessed.
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