Veredeling van witlof voor het trekken zonder dekgrond

J.A. Huyskes

    Research output: Thesisinternal PhD, WU


    Forcing of Belgian endive without covering soil could improve work efficiency. Existing varieties gave loose instead of well closed heads. To improve this, a study was made of factors determining head formation, with covering soil. Roots should be exposed to a certain amount of cold, if they were to form a good head. The later the variety, the more cold was required. Roots to be forced without covering soil needed extra cold. Varieties must be bred for this purpose.

    The breeder could use the need for cold as a criterion in selection for earliness and to improve the uniformity of his varieties. The length of the core was negatively correlated with the need for cold. This character was also of use in testing of varieties. The result of early forcing could be improved by previously cooling the roots.

    Practical trials on forcing without covering soil and selection for core length confirmed the results of the research.

    Original languageDutch
    QualificationDoctor of Philosophy
    Awarding Institution
    • Wageningen University
    • Doorenbos, J., Promotor
    Award date22 Nov 1963
    Place of PublicationBennekom
    Publication statusPublished - 1963


    • cichorium intybus
    • chicory
    • cultivation
    • cultural methods

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