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.
Since trace elements are generally involved in enzymic reactions taking place within the plant an imbalance in the trace nutrient supply could be expected also to affect the uptake of major elements by roots and their translocation through the plant.Pot experiments with ascending doses of trace nutrients were carried out with oats, tomatoes and lucerne as test crops. Yields and the chemical composition of the crops were estimated. A significant effect of Zn was found on the yield of oats, while the yield of tomatoes was affected by B and Fe.Consequently also varying amounts of major nutrients were removed by test plants from the culture medium. Uptake of N by oats and lucerne increased with B supply. But high levels of iron reduced the uptake of P in all three test crops. The total uptake of K, Mg and Na was also affected by interactions of various trace elements but no uniformity was found in reactions of the crops tested.This absence of uniformity suggested that the observed effects were not caused by changes in the uptake mechanism but were due to differences in the general physiological condition of the plant.
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