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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 104300
Title Over de afbraak van Ca-cyaanamide in den grond
show extra info.
door J. Temme
Author(s) Temme, J.
Publisher Wageningen : Veenman
Publication year 1946
Description 100 p
Notes Proefschrift Wageningen
Tutors Smit, Prof. Dr. J.
Graduation date 1946-02-07
Dissertation no. 134
Author abstract show abstract
The weed killer calcium cyanamide was also a slowly acting N fertilizer. It released N as urea, which was subsequently converted to ammonium carbonate and nitrate. The first phase was mainly physico-chemical involving hydrolysis to calcium hydroxide and cyanamide, which was then hydrolysed to urea. It was promoted by free H +in the soil and exceeded any possible microbiological action, as application initially caused a decrease in the soil microflora.

The second phase was microbiological; first urea was released. The herbicidal effect was due to the formation of dicyanodiamide and its decomposition products, which were toxic also to most micro-organisms. It formed at high pH (8-10) if the topdressing became moist. Nitrification was depressed in concentrations higher than 10% of total N. But the initial effect perhaps limited the proliferation of pathogens.

Apart from killing weeds, it might injure both crop and microflora, if not incorporated into the soil.

A method was developed of estimating the rate of ammonification and nitrification of calcium cyanamide for different soil samples and, thus, the amount of fertilizer needed for optimum effect.

Online full textINTERNET
On paper FORUM ; STACKS ; 530E14
FORUM ; STACKS ; NN08202,134
Keyword(s) (cab) soil / calcium / nitrification / organic compounds / soil chemistry / derivatives / cyanogens
Categories Soil Chemistry
Publication type PhD thesis
Language Dutch; Flemish
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