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Die invloed van mangaan op vrugrypwording by Vitis Vinifera L. cv. Pinotage
Thesis (MSc)--Stellenbosch University, 1964.
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| Format: | Thesis |
| Language: | af_ZA |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867614099139985408 |
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| access_status_str | Open Access |
| author | Barker, Wilma (Wilma Henriette) |
| author2 | De Bruyn, J. A. |
| author_browse | Barker, Wilma (Wilma Henriette) De Bruyn, J. A. |
| author_facet | De Bruyn, J. A. Barker, Wilma (Wilma Henriette) |
| author_sort | Barker, Wilma (Wilma Henriette) |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MSc)--Stellenbosch University, 1964. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/67657 |
| institution | Stellenbosch University (South Africa) |
| language | af_ZA |
| last_indexed | 2026-06-10T12:46:39.009Z |
| 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:10019.1/67657 Die invloed van mangaan op vrugrypwording by Vitis Vinifera L. cv. Pinotage Barker, Wilma (Wilma Henriette) De Bruyn, J. A. Stellenbosch University. Faculty of AgriSciences. Dept. of Viticulture and Oenology and Institute for Wine Biotechnology . Grapes -- Effect of minerals on Trace elements in plant nutrition Manganese Fruit -- Ripening Grapes -- Ripening Dissertations -- Wine biotechnology Theses -- Wine biotechnology Thesis (MSc)--Stellenbosch University, 1964. ENGLISH ABSTRACT: The influence of manganese sulphate sprays on the yield and ripening of fruit of manganese-deficient Vitis vinifera L. (cv. Pinotage) plants was investigated. Ripening was determined in terms of changes in concentration of the indivi= dual and total sugars and organic acids. Increasing concentrations of manganese sulphate resulted in significant increases in the manganese content of the leaves. The higher levels of manganese were associated with an increase in yield. Ripening, however, was retarded, in that the percentage sugar of the fruit was decreased and titrable acid content increased. The principal sugars present in the fruit were sucrose, glucose, fructose and xylose. Malic and tartaric acids were the main organic acid constituents. Glucose and fructose increased sharply, and sucrose and xylose slightly during ripening of the fruit, whereas malic and tartaric acid de= creased. Glucose, fructose, tartaric and malic acid tended to increase with increasing manganese content. Sucrose and xylose were not appreciably affected. An application of 1% manganese sulphate can be recommend- · ed for manganese deficient vineyards, as it results in an increased yield, in addition to delaying ripening until a more favourable time for handling. Furthermore, the lowered sugar content of the fruit may be advantageous for the pro= duction of dry wines from Pinotage grapes . AFRIKAANSE OPSOMMING: Die invloed van mangaansulfaatbespuiting op die opbrengs en vrugrypwording van Vitis vinifera L. cv. Pinotage, wat aan ernstige mangaantekorte gely het, is ondersoek. Rypwording is met betrekking tot veranderings in die konsentrasies van totale en indiwiduele suikers en sure bepaal. 2. Toenemende konsentrasies Mnso4 (van O.2% tot l.O%) het n betekenisvolle toename in die mangaangehalte van die blare (van 3 tot 80 d.p.m.) tot gevolg gehad. Die ver= hoogde mangaangehalte het gepaard gegaan met n toe= name in opbrengs, terwyl rypwording vertraag is, deurdat die suikerpersentasie en die titreerbare suurgehalte ver= meerder is in vergelyking met die kontroleplante. 3. Die vernaamste suikers in die vrugte was sukrose, glukose, fruktose en xilose. Glukose en fruktose het vinnig en sukrose en xilose geleidelik toegeneem met die verloop van rypwording. In die ryp vrugte was glukose en fruk= tose oorheersend. Glukose en fruktose was geneig om toe te neem met toenemende mangaangehalte, terwyl sukrose en xilose nie beinvloed is nie. 4. Appelsuur en Wynsteensuur was die oorwegende sure in die vrugte. Beide hierdie sure het gedurende rypwording verminder. Hulle konsentrasies het oor die algemeen toegeneem namate die mangaankonsentrasie verhoog is. 5. Dit is afgelei dat bespuiting met 1.0% MnS04 aanbeveel kan word vir wingerde met mangaantekorte, daar dit n toename in opbrengs, gepaard met 'n vertraging in rypwording tot gevolg gehad het. So 'n vertraging mag moontlik in parstyd voordelig wees. Die verlaagde suikerpersentasie van die vrugte is moontlik gunstig vir die bereiding van droe wyne, waarvoor Pinotage hoofsaaklik gebruik word. Masters 2012-08-27T12:26:12Z 2012-08-27T12:26:12Z 1964-12 Thesis http://hdl.handle.net/10019.1/67657 af_ZA Stellenbosch University [iv], 55 p. : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Grapes -- Effect of minerals on Trace elements in plant nutrition Manganese Fruit -- Ripening Grapes -- Ripening Dissertations -- Wine biotechnology Theses -- Wine biotechnology Barker, Wilma (Wilma Henriette) Die invloed van mangaan op vrugrypwording by Vitis Vinifera L. cv. Pinotage |
| title | Die invloed van mangaan op vrugrypwording by Vitis Vinifera L. cv. Pinotage |
| title_full | Die invloed van mangaan op vrugrypwording by Vitis Vinifera L. cv. Pinotage |
| title_fullStr | Die invloed van mangaan op vrugrypwording by Vitis Vinifera L. cv. Pinotage |
| title_full_unstemmed | Die invloed van mangaan op vrugrypwording by Vitis Vinifera L. cv. Pinotage |
| title_short | Die invloed van mangaan op vrugrypwording by Vitis Vinifera L. cv. Pinotage |
| title_sort | die invloed van mangaan op vrugrypwording by vitis vinifera l cv pinotage |
| topic | Grapes -- Effect of minerals on Trace elements in plant nutrition Manganese Fruit -- Ripening Grapes -- Ripening Dissertations -- Wine biotechnology Theses -- Wine biotechnology |
| url | http://hdl.handle.net/10019.1/67657 |
| work_keys_str_mv | AT barkerwilmawilmahenriette dieinvloedvanmangaanopvrugrypwordingbyvitisviniferalcvpinotage |