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Record nummer 104438
Titel The exchangeable cations in soils flooded with sea water
toon extra info.
Wiebe Henderikus van der Molen
Auteur(s) Molen, W.H. van der
Uitgever 's-Gravenhage : Staatsdrukkerij en Uitgeverijbedrijf
Jaar van uitgave 1958
Pagina's X, 167 p ill
Titel van reeks Verslagen Landbouwkundige Onderzoekingen (63-17)
Annotatie(s) Proefschrift Wageningen
Tutor(s) Zuur, Prof. Dr. Ir. A.J. ; Schuffelen, Prof. Dr. A.C.
Promotiedatum 1958-07-04
Proefschrift nr. 246
Samenvatting door auteur toon abstract
The changes in the exchangeable cations of soils flooded with sea-water were extensively studied in the Netherlands after the inundations of 1940, 1945 and 1953. A synopsis of the results was given, both from a theoretical and a practical viewpoint.

Current formulae for ion-exchange tested in the laboratory gave fair descriptions for the competition between two species of cations, but were inadequate if more ionic species were involved. The behaviour of Na in flooded soils in competition with K, Mg, and Ca was therefore described by an empirical Naadsorption isotherm.

Flooded soils were considerably enriched in Na, K and Mg. Of these, only Na changed noticeably during the first years after renewed drainage. Na was slowly replaced by Ca derived from CaCO 3 . The changes proceed from top to bottom through the soil profile, the limiting factor being the removal of liberated Na-ions by leaching. The theory of column operation gave a qualitative explanation of the phenomena observed.

The regeneration of flooded soils could be promoted by application of gypsum, calcium chloride or sulphur, of which gypsum was extensively used in practice. Of the gypsum applied, about 50 % was effective in removing exchangeable Na from the upper 20 cms. On this basis, an estimation of gypsum requirements could be made.

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Trefwoorden (cab) bodemchemie / verzilting / bodem / uitwisselbare kationen / overstromingen
Rubrieken Bodemchemie
Publicatie type Proefschrift
Taal Engels
Toelichting In de periode 1939-1953 werden grote gebieden in het zuidwesten van Nederland met zout of brak water overstroomd, ten dele door militaire inundaties gedurende de Tweede Wereldoorlog, ten dele door natuurlijke oorzaken (dijkvallen, stormvloed van 1 februari 1953). Bij deze onderzoekingen werd vooral aandacht besteed aan het gehalte aan uitwisselbaar natrium, omdat het natrium beschouwd mag worden als de voornaamste factor bij het ontstaan van de slechte structuur van overstroomde gronden.
Betrokken instanties Rijkswaterstaat, Directie IJsselmeergebied (RDIJ)
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