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Die invloed van grondverdigting op die fosfaat opname deur tabak (Afrikaans)
Dissertation (MSc)--University of Pretoria, 2005.
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University of Pretoria
2013
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| _version_ | 1867613673451683840 |
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| access_status_str | Open Access |
| author2 | Claassens, A.S. (Andries Stephanus), 1943- |
| author_browse | Claassens, A.S. (Andries Stephanus), 1943- |
| author_facet | Claassens, A.S. (Andries Stephanus), 1943- |
| collection | Thesis |
| dc_rights_str_mv | © 2003 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means,without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc)--University of Pretoria, 2005. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/24179 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:39:53.208Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/24179 Die invloed van grondverdigting op die fosfaat opname deur tabak (Afrikaans) Claassens, A.S. (Andries Stephanus), 1943- upetd@up.ac.za Dreyer, Jasper Gestaphus Grondverdigting en plantreaksie Plants effect of soil compensation on Fosfor in landbou Phophorus in agriculture Tobacco Calcium fertilizers Tabak Fosforinhoud van tabakblare UCTD Dissertation (MSc)--University of Pretoria, 2005. In the tobacco production area of Nelspruit, a problem is experienced in increasing the phosphorus content of tobacco leaves to above0.25% despite of the high phosphorus content of the soil (higher than 30 mg/kg Bray 1). The aim of this study was to investigate the reasons for the low P content in tobacco leaves and how P and Ca content in the soil and soil compaction influence it. During the 1998/99 season, field tests were conducted at 3 different localities in the Nelspruit area to investigate the influence of soil compaction, phosphorus and calcium supply on P uptake. Treatment consisted of 2 calcium treatments, 2 soil treatment actions and 5 phosphorus levels. Leaf samples were taken for chemical analysis, 115 to 120 days after planting and the different treatments were harvested as they ripened physiologically and cured in a tobacco drying oven. This was used to calculate the yield, quality and income per hectare. A pot experiment were done under controlled conditions at the experimental farm of the University of Pretoria with soil from one of the field plots. With the pot experiment different bulk densities were simulated with 3 phosphorus and 2 calcium levels, to evaluate the effect thereof on P uptake. As the leaves ripened physiologically they were picked and dried for chemical analysis. On all the data an analysis of variance was performed. A final conclusion can be made that, high levels of P fertilization are unnecessary and attention must be paid to soil compaction, and that gypsum must be applied with care. Although not investigated in this study the low P content of leaves can be due to the genetic characteristics of the tobacco cultivars used in the Nelspruit area and the high levels of zinc in the soil which can cause P precipitation in roots that could restrict the P transport to the leaves. With the pot experiment it is proved that high P applications lead to a decline of the percentage zinc in the leaves. The conclusion is made in this study that when soil compaction were overcome, high and low dosages of phosphorus and the increase of calcium levels in the soil did not show a constant increase in P values above 0.25%. Plant Production and Soil Science unrestricted 2013-09-06T16:51:22Z 2005-05-06 2013-09-06T16:51:22Z 2004-04-20 2005-05-06 2005-04-28 Dissertation Dreyer JG, 2003, Die invloed van grondverdigting op die fosfaat opname deur tabak , MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/24179 > H893/th http://hdl.handle.net/2263/24179 http://upetd.up.ac.za/thesis/available/etd-04282005-112943/ © 2003 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means,without the prior written permission of the University of Pretoria. application/pdf application/pdf application/pdf application/pdf University of Pretoria |
| spellingShingle | Grondverdigting en plantreaksie Plants effect of soil compensation on Fosfor in landbou Phophorus in agriculture Tobacco Calcium fertilizers Tabak Fosforinhoud van tabakblare UCTD Die invloed van grondverdigting op die fosfaat opname deur tabak (Afrikaans) |
| title | Die invloed van grondverdigting op die fosfaat opname deur tabak (Afrikaans) |
| title_full | Die invloed van grondverdigting op die fosfaat opname deur tabak (Afrikaans) |
| title_fullStr | Die invloed van grondverdigting op die fosfaat opname deur tabak (Afrikaans) |
| title_full_unstemmed | Die invloed van grondverdigting op die fosfaat opname deur tabak (Afrikaans) |
| title_short | Die invloed van grondverdigting op die fosfaat opname deur tabak (Afrikaans) |
| title_sort | die invloed van grondverdigting op die fosfaat opname deur tabak afrikaans |
| topic | Grondverdigting en plantreaksie Plants effect of soil compensation on Fosfor in landbou Phophorus in agriculture Tobacco Calcium fertilizers Tabak Fosforinhoud van tabakblare UCTD |
| url | http://hdl.handle.net/2263/24179 http://upetd.up.ac.za/thesis/available/etd-04282005-112943/ |