PhD theses

All Wageningen University PhD theses

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    Wageningen PhD theses


    This database contains bibliographic descriptions of all Wageningen University PhD theses from 1920 onwards. It is updated on a daily basis by WUR Library.

    Author abstracts and/or summaries are added to all descriptions. A link to the full text dissertation is added to the bibliographic description. In a few cases, no electronic version is available, mostly because of copyright issues.

    Hard copies of all theses are available for loan at WUR Library. To request them, click the link Request this publication in the full record presentation. This is a fee based service.

    mail icon WUR Library, 9 july 2012

     

Record number 104458
Title De bloembollenstreek : resultaten van een veldbodemkundig onderzoek in het bloembollengebied tussen Leiden en het Noordzeekanaal
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door K. van der Meer
Author(s) Meer, K. van der
Publisher 's-Gravenhage : Staatsdrukkerij
Publication year 1952
Description VIII, 156 p + 3 losse krt.
Notes Proefschrift Wageningen
Ook verschenen als handelsuitgave
Tutors Edelman, Prof. Dr. Ir. C.H.
Graduation date 1952-09-30
Dissertation no. 177
Author abstract show abstract
The Dutch Bulb Fields are situated on the Beach-ridge landscape between the Rhine Estuary and the Y-Polders in the mid-western part of North Holland and South Holland. Culture of some horticultural crops (tulips, daffodils) is important in this area because of the special requirements of these crops: rather coarse, calcareous, deep sandy and highly porous soils easy to penetrate by roots, without organic matter, without impermeable layers and a stable watertable. Continuous deep digging is inevitable. Soil formation (mainly decalcification) in the beach ridges over some 3000 years has caused non-calcareous topsoils and a slight podsolization; the soils have been improved by digging off sand. The area has been influenced by peat growth, marine and estuarine sediments and shifting sand. The soil survey resulted in a soil map, indicating soil quality. From the results ensued the recommendation of improving soil by suction dredging. This had to be planned and carried out very carefully, because the formation of humous and clayey layers in the new profile would make the soil completely unsuitable for valuable horticultural crops. Geological studies on Middle and Late Holocene geology and stratigraphy showed that the beach ridges were formed during and after the deposition of the Atlantic Old Marine Clay (4000-2000 B.C.).

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Keyword(s) soil formation / soil surveys / maps / bollenstreek / zuid-holland / noord-holland
Categories Soil Classification
Publication type PhD thesis
Language Dutch; Flemish
About (Dutch) Gebiedsinformatie Bollenstreek
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