Variety traits
The bulb is a storage organ of the plant that determines the commercial value of a cultivar through a combination of morphological and biological characteristics. It is evaluated by mass, number of bulbs per cluster, number of growing points, shape, and qualitative indicators of keeping quality and…
Mentioned in descriptions 7 519 varieties reference book.
The bulb is a storage organ of the plant, the parameters of which are key varietal traits when assessing crop marketability. The main morphological characteristics include bulb mass, its shape, defined as the ratio of height to diameter, as well as the color of dry and succulent scales and neck thickness. Important biological indicators are the number of bulbs per cluster, which characterizes the ability to form several bulbs from a single basal plate, and the number of growing points, which reflects the number of buds.
Evaluation of these traits during variety testing is carried out through biometric analysis, laboratory determination of sugar and dry matter content, and the study of keeping quality and taste. Bulb mass and shape depend directly on agronomic conditions: planting density, cultivation method, and availability of mineral nutrients. Bulb uniformity in size is an important advantage, as it facilitates the mechanization of harvesting and pre-sale preparation processes.
Cultivar resistance and productivity are predetermined by genetically fixed features of the number of growing points and the number of bulbs per cluster. For bulb onion varieties, a low number of bulbs per cluster is preferred, which allows for obtaining large marketable produce, whereas a high number of bulbs per cluster is characteristic of certain species, for example, shallots. Bulb quality also includes its ability to retain commercial appearance during storage, which is assessed during special tests for resistance to rot and general keeping quality.
Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.
Allium cepa L. · Onion
WIJNKER THAAM
Allium cepa L. · Onion
Her Bimsdeboer
Allium cepa L. var. cepa · Onion
Bejo Zaden BV (NL)
Allium cepa L. · Onion
VILMORIN
Allium porrum L. · Leek
Bejo Zaden B.V.
Allium cepa L. · Onion
Syngenta Seeds BV (NL)
Lilium L. · Lily
Vletter & Den Haan Beheer B.V
Allium cepa L. var. cepa · Onion
Nickerson Zwaan B.V. (NL)
Lilium L. · Lily
VLETTER FLORIS| Floris Vletter
Allium fistulosum L. · Welsh onion
Jock Rudi
Allium cepa L. · Onion
Bejo Zaden, NL
Allium cepa L. · Onion
Nunhems, NL
Foeniculum vulgare Mill. · Fennel
Henk Driessen
Allium cepa L. · Onion
Martin Slot, John Pieter Schipper,
Allium cepa L. · Onion
Superior, Velika Plana
Allium cepa L. · Onion
MAURIZIO BACCHI
Allium cepa L. · Onion
PETOSEED, NL
Allium cepa L. · Onion
Paul Degreef
Allium cepa L. · Onion
SEMINIS VEGETABLE SEEDS, NL
Lilium L. · Lily
Vletter en den Haan Beheer B.V.
Allium cepa L. · Onion
Wim van Ham
Lachenalia Jacq. f. ex Murr. · Cape Cowslip
ricultural Research Council
Allium cepa L. · Onion
Quedlinburg
Allium cepa L. var. cepa · Onion
Bejo Zaden BV (NL)