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.
The negative value of capillary pressure (D) was defined and its practical significance considered. The results of former research on rate and final value for capillary uptake were discussed.The author constructed various meters for the measurement of capillary uptake. They were described and their dimensions and properties were compared with those used by other workers. The minimum and maximum values for D due to the heterogeneity of the soil material were tabulated for a series of sandy soils or soil fractions. These results were compared with those obtained in model experiments with perforated disks.A series of new concepts was defined, concerning the forms and properties of isolated water in the soil profile. The terms 'sejunction' and 'funicular' and 'pendular' water were discussed. Their importance was demonstrated by a series of model experiments with sand fractions of different size grades. The distribution functions for the pores of these sands were calculated and compared with the experimental results. A few calculated examples were discussed on the importance of the isolated water for aeration of soil. Conclusions were derived for the presence of cracks in the soil profile and the influence of the distribution of rainfall on the amount of available water to plants.
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