Library Catalogue

Library Catalogue

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    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.

Record number 104103
Title Aspects of assimilation and accumulation of nitrate in some cultivated plants
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A. Darwinkel
Author(s) Darwinkel, A.
Publisher Wageningen : Centre for Agricultural Publishing and Documentation
Publication year 1975
Description 64 p
Notes Proefschrift Wageningen  show all notes
Met een samenvatting in het Nederlands
Ook verschenen als handelsuitgave
ISBN 9022005860
Tutors Hart, Prof. Ir. M.L. 't
Graduation date 1975-10-24
Dissertation no. 640
Author abstract show abstract
In a study on the accumulation of nitrate nitrogen in plants, turnip, rape, oats, Italian ryegrass, Westerwolths ryegrass, carrot and spinach were used. During growth the production and distribution of dry matter and the contents of total N and NO 3 -N were measured. NO 3 accumulation occurs when the N uptake exceeds assimilation. The uptake was largely dependent on N supply and plant species, whereas the conversion was closely associated with production and distribution of dry matter. Leaf blades contain high organic N and low NO 3 concentrations. The activity of the nitrate reductase was mainly located in leaf blades. This activity was highest in a young immature leaf and was lower the older the leaf. Production of leaves affected the NO 3 conversion considerably. During the growth period a gradual decrease of the conversion took place per unit dry matter produced, because of a smaller demand for proteins. The total N content in the dry matter, above which NO 3 accumulation takes place, was high in a young plant, but decreased during growth, whereas an increasing part of the extra NO 3 absorbed accumulated simultaneously. Turnips accumulated most NO 3 , because of their high N uptake. Other plant species could also reach NO 3 levels that are toxic for cattle. In rape and Italian ryegrass this is caused by a high N uptake, in oats and carrot by a poor conversion.
Online full textINTERNET
On paper FORUM ; STACKS ; NN08200,640
Keyword(s) (cab) nitrogen / assimilation
Categories Fertilizers, Fertilizer Application / Soil Fertility / Plant Physiology
Publication type PhD thesis
Language English
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