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Die effek van plantgroeireguleerders op vrugontwikkeling van buite-seisoen kweekhuistamaties
Tesis (M. Sc. Agric.) -- Universiteit van Stellenbosch, 1997.
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| Format: | Thesis |
| Language: | af_ZA |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613949657088000 |
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| access_status_str | Open Access |
| author | Van Tonder, Catherina Susara Magdelena |
| author2 | Stellenbosch University. Faculty of AgriSciences. Dept. of Agricultural Economics. |
| author_browse | Stellenbosch University. Faculty of AgriSciences. Dept. of Agricultural Economics. Van Tonder, Catherina Susara Magdelena |
| author_facet | Stellenbosch University. Faculty of AgriSciences. Dept. of Agricultural Economics. Van Tonder, Catherina Susara Magdelena |
| author_sort | Van Tonder, Catherina Susara Magdelena |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Tesis (M. Sc. Agric.) -- Universiteit van Stellenbosch, 1997. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/55465 |
| institution | Stellenbosch University (South Africa) |
| language | af_ZA |
| last_indexed | 2026-06-10T12:44:16.501Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/55465 Die effek van plantgroeireguleerders op vrugontwikkeling van buite-seisoen kweekhuistamaties Van Tonder, Catherina Susara Magdelena Stellenbosch University. Faculty of AgriSciences. Dept. of Agricultural Economics. Tomatoes -- Development Fruit -- Development -- Regulation Plant regulators -- Physiological effect Greenhouse plants Tomatoes -- Yields Dissertations -- Agriculture Tesis (M. Sc. Agric.) -- Universiteit van Stellenbosch, 1997. ENGLISH ABSTRACT: The yield of greenhouse tomatoes produced out-of-season or during unfavourable environmental conditions is usually poor. Short photoperiod, low light intensities and low temperatures limit photosynthesis and therefore the production of carbohydrates, essential for the production of viable pollen. High temperatures contribute to deviations in flower morphology like splitting of the anther cone and style exsertion which therefore results in poor pollen transfer and low fruit set. Inadequate pollination results in seedless (Partenocarpic) fruit development with non-marketable sizes and shapes. Truss-vibration with an electric truss-vibrator is successfully used in greenhouses to enhance pollen transfer and pollination. However, truss-vibration is labour intensive and may increase the chance of damage to flowers. Therefore chemical manipulation of fruit development with plant growth regulators (PGR) offers an useful alternative. AFRIKAANSE OPSOMMING: Die verbouing van kweekhuistamaties buite-seisoen of tydens ongunstige omgewingstoestande bring lae opbrengste teweeg. Kort fotoperiodes, lae stralingsintensiteit en temperatuur gedurende die winter en vroeë lente is beperkend vir fotosintese wat sodoende die produksie van koolhidrate benadeel. Gevolglik word bestuiwing ook benadeel weens lae lewensvatbaarheid van die stuifmeel. Met hoë temperatuut blootstelling is afwykings in blommorfologie soos byvoorbeeld, 'n gesplete meedraadbuis en verlengde stylposisies grootliks verantwoordelik vir onsuksesvolle stuifmeeloordrag en lae vrugset. Beperkte bestuiwing bring saadlose (partenokarpiese) vrugontwikkeling mee asook vrugte met nie-bemarkbare groottes en vorms. Trosvibrasie, met behulp van 'n elektriese trosvibreerder, word in kweekhuise toegepas om stuifmeeloordrag en sodoende bestuiwing aan te help. Bogenoemde metodes is arbeidsintensief en verhoog ook die kanse vir skade aan blomme. Chemiese manupilasie van vrugontwikkeling met behulp van plantgroeireguleerders (PGR) bied dus 'n bruikbare alternatief. Masters 2012-08-27T11:37:04Z 2012-08-27T11:37:04Z 1997 Thesis http://hdl.handle.net/10019.1/55465 af_ZA Stellenbosch University 65 pages : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Tomatoes -- Development Fruit -- Development -- Regulation Plant regulators -- Physiological effect Greenhouse plants Tomatoes -- Yields Dissertations -- Agriculture Van Tonder, Catherina Susara Magdelena Die effek van plantgroeireguleerders op vrugontwikkeling van buite-seisoen kweekhuistamaties |
| title | Die effek van plantgroeireguleerders op vrugontwikkeling van buite-seisoen kweekhuistamaties |
| title_full | Die effek van plantgroeireguleerders op vrugontwikkeling van buite-seisoen kweekhuistamaties |
| title_fullStr | Die effek van plantgroeireguleerders op vrugontwikkeling van buite-seisoen kweekhuistamaties |
| title_full_unstemmed | Die effek van plantgroeireguleerders op vrugontwikkeling van buite-seisoen kweekhuistamaties |
| title_short | Die effek van plantgroeireguleerders op vrugontwikkeling van buite-seisoen kweekhuistamaties |
| title_sort | die effek van plantgroeireguleerders op vrugontwikkeling van buite seisoen kweekhuistamaties |
| topic | Tomatoes -- Development Fruit -- Development -- Regulation Plant regulators -- Physiological effect Greenhouse plants Tomatoes -- Yields Dissertations -- Agriculture |
| url | http://hdl.handle.net/10019.1/55465 |
| work_keys_str_mv | AT vantondercatherinasusaramagdelena dieeffekvanplantgroeireguleerdersopvrugontwikkelingvanbuiteseisoenkweekhuistamaties |