Selectieve teelt van tulpen gebaseerd op produktie-analyse

G. Hekstra

    Research output: Thesisinternal PhD, WU

    Abstract

    In tulip cultivation many stocks of good producing varieties in course of time showed a decrease in production of large marketable bulbs. Meanwhile the number of small bulbs in these stocks increased. This phenomenon was investigated. It was attributable to three causes: contamination of the stock by either foreign material ('thieves') or mutants originating from the variety itself ('wild'); a wrong temperature treatment of the planting material; differences in production between the several bulb types growing at different places in the mother bulb.

    The newly produced bulbs were named, after the scale of the mother bulb in whose axil they were formed, as A, B, C, and D for the fleshy scales (from inside to exterior) and H for the dry tunic. The production pattern of all types and grades was studied during three years. Especially the A and H bulbs were superior to the others in productivity. Second were B bulbs, followed by C and D. This productivity was not concerned with weight increase but to growth of the main bulb and offset number, which should not be too high.

    Based on these results a selection scheme was proposed to eliminate all bulbs inferior in productivity. This scheme was the basis for tulip cultivation with selection in the meantime, so that productivity of the stock stayed maximum.

    Original languageDutch
    QualificationDoctor of Philosophy
    Awarding Institution
    • Wageningen University
    Supervisors/Advisors
    • Doorenbos, J., Promotor
    Award date2 Feb 1968
    Place of PublicationWageningen
    Publisher
    Print ISBNs9789022001639
    Publication statusPublished - 1968

    Keywords

    • tulips
    • liliaceae
    • ornamental bulbs
    • cultivation
    • selection

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