Abstract
The influence of seed chilling on the flower and seed formation of some vegetable and related crops was studied. The seed was germinated and then cooled almost to 0°C so that it was still suited to mechanical sowing, a prerequisite if the technique were to be used in practice. This treatment was here called jarovization as introduced by Lysenko for wheat. The object was to bring certain spring-sown crops to flowering and sufficient seed production in the same year.
Jarovization was only partly successful. Most of the crops under investigation still required a period of plant vernalization to behave as an annual. With beet (Beta vulgaris L.), black radish (Raphanus sativus L. var. niger), swede turnip (Brassica napus L. napobrassica), Belgian endive (Cichorium intybus L. var. foliosum) and some other species the jarovized crop ran completely to seed when an untreated crop of the same cv. sown on the same date yielded at least 15 to 20 % early bolters.
The best sowing time for a full-grown seedcrop from jarovized seed was two, or, at most, three weeks later than from untreated seed.
Many species could not be vernalized sufficiently until the young plants reached a certain age (juvenile phase), if they were to form flowers in ensuing favourable conditions.
Jarovization was only partly successful. Most of the crops under investigation still required a period of plant vernalization to behave as an annual. With beet (Beta vulgaris L.), black radish (Raphanus sativus L. var. niger), swede turnip (Brassica napus L. napobrassica), Belgian endive (Cichorium intybus L. var. foliosum) and some other species the jarovized crop ran completely to seed when an untreated crop of the same cv. sown on the same date yielded at least 15 to 20 % early bolters.
The best sowing time for a full-grown seedcrop from jarovized seed was two, or, at most, three weeks later than from untreated seed.
Many species could not be vernalized sufficiently until the young plants reached a certain age (juvenile phase), if they were to form flowers in ensuing favourable conditions.
Original language | Dutch |
---|---|
Qualification | Doctor of Philosophy |
Awarding Institution | |
Supervisors/Advisors |
|
Award date | 26 Mar 1965 |
Place of Publication | Alkmaar |
Publisher | |
DOIs | |
Publication status | Published - 26 Mar 1965 |
Keywords
- cultural methods
- vegetables
- vegetable growing