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Experiments to modify grape juice potassium content and wine quality on granite derived soils near Paardenberg
Thesis (MScAgric (Soil Science))--University of Stellenbosch, 2006.
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| Format: | Thesis |
| Language: | English |
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Stellenbosch : University of Stellenbosch
2008
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| _version_ | 1867614108193390592 |
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| access_status_str | Open Access |
| author | Agenbach, G. |
| author2 | Saayman, D. |
| author_browse | Agenbach, G. Saayman, D. |
| author_facet | Saayman, D. Agenbach, G. |
| author_sort | Agenbach, G. |
| collection | Thesis |
| dc_rights_str_mv | University of Stellenbosch |
| description | Thesis (MScAgric (Soil Science))--University of Stellenbosch, 2006. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/3035 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:46:47.817Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2008 |
| publishDateRange | 2008 |
| publishDateSort | 2008 |
| publisher | Stellenbosch : University of Stellenbosch |
| publisherStr | Stellenbosch : University of Stellenbosch |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/3035 Experiments to modify grape juice potassium content and wine quality on granite derived soils near Paardenberg Agenbach, G. Saayman, D. Fey, M. V. University of Stellenbosch. Faculty of Agrisciences. Dept. of Soil Science. Grapevine Vitis viniferal Berry potassium Potassium uptake K transport Dissertations -- Soil science Theses -- Soil science Thesis (MScAgric (Soil Science))--University of Stellenbosch, 2006. High potassium content in grape juice and wine are associated with low quality red wine in warm wine producing countries. In an attempt to reduce the potassium content of juice, must and wine, a field experiment was laid out on the farms Meerlus and Kersfontein in the Paardeberg area near Wellington in 1998 on granite derived soils to investigate the effect of canopy management and fertiliser applications on berry K accumulation and wine quality. Four fertiliser applications, three canopy treatments and a MgSO4 foliar spray were studied. The three fertiliser treatments being: none (control), CaSO4, Ca(OH)2, and MgSO4 applications. The canopy treatments were: thin to two shoots per bearer, tip, vertical shoot positioning (VSP) and the removal of yellow leaves and lateral shoots (canopy 1), thin to three shoots per bearer, top after véraison and VSP (canopy 2) and VSP with top after véraison (canopy 3/control). Magnesium sulfate sprays were applied at véraison for two seasons (1999/00 and 2000/01). Seasonal effects produced the most significant differences in this experiment. Canopy treatments did not affect juice K concentration at harvest. Canopy 1 and 2 produced significantly lower wine pH values at Kersfontein. Fertiliser treatments had no effect on juice K concentration nor did it affect wine quality. Magnesium sulphate foliar sprays did not affect juice K concentration at harvest but significantly lowered juice and wine pH, improved wine colour density and total phenolic content. It appears for this experiment that soil K content before véraison, shoot growth at and after véraison and water stress after véraison were the main factors determining juice K concentration at harvest. Masters 2008-01-21T10:19:58Z 2010-06-01T09:04:28Z 2008-01-21T10:19:58Z 2010-06-01T09:04:28Z 2006-12 Thesis http://hdl.handle.net/10019.1/3035 en University of Stellenbosch 695326 bytes application/pdf application/pdf Stellenbosch : University of Stellenbosch |
| spellingShingle | Grapevine Vitis viniferal Berry potassium Potassium uptake K transport Dissertations -- Soil science Theses -- Soil science Agenbach, G. Experiments to modify grape juice potassium content and wine quality on granite derived soils near Paardenberg |
| title | Experiments to modify grape juice potassium content and wine quality on granite derived soils near Paardenberg |
| title_full | Experiments to modify grape juice potassium content and wine quality on granite derived soils near Paardenberg |
| title_fullStr | Experiments to modify grape juice potassium content and wine quality on granite derived soils near Paardenberg |
| title_full_unstemmed | Experiments to modify grape juice potassium content and wine quality on granite derived soils near Paardenberg |
| title_short | Experiments to modify grape juice potassium content and wine quality on granite derived soils near Paardenberg |
| title_sort | experiments to modify grape juice potassium content and wine quality on granite derived soils near paardenberg |
| topic | Grapevine Vitis viniferal Berry potassium Potassium uptake K transport Dissertations -- Soil science Theses -- Soil science |
| url | http://hdl.handle.net/10019.1/3035 |
| work_keys_str_mv | AT agenbachg experimentstomodifygrapejuicepotassiumcontentandwinequalityongranitederivedsoilsnearpaardenberg |