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Modelling the soil water balance of canola Brassica napus L (Hyola 60)
Dissertation (MSc (Agric))--University of Pretoria, 2005.
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University of Pretoria
2013
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| _version_ | 1867613490638749696 |
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| access_status_str | Open Access |
| author2 | Steyn, Joachim Marthinus |
| author_browse | Steyn, Joachim Marthinus |
| author_facet | Steyn, Joachim Marthinus |
| collection | Thesis |
| dc_rights_str_mv | © 2004, 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 (Agric))--University of Pretoria, 2005. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/28069 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:36:58.812Z |
| 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:2263/28069 Modelling the soil water balance of canola Brassica napus L (Hyola 60) Steyn, Joachim Marthinus Annandale, John George eyob1971@yahoo.co.uk Tesfamariam, Eyob Habte Canola Soil water balance Modelling Deficite UCTD Dissertation (MSc (Agric))--University of Pretoria, 2005. Soil Water Balance (SWB) is a generic crop growth and irrigation-scheduling model. It improves on traditional methods of irrigation scheduling using evaporative demand by mechanistically and dynamically, quantitatively considering the soil–plant-atmosphere continuum. However, it needs specific crop growth parameters, which are not readily available for canola. The objective of this study was to determine crop growth parameters specific to canola and to identify the effect of water stress at different stages of growth on seed and oil yield. The study was conducted on the experimental farm of the University of Pretoria, South Africa, under a rain shelter during 2002 and in an open field during 2003. Weather data were recorded with an automatic weather station, phenological stages monitored frequently and growth analyses carried out every two weeks. Soil water content was measured with a neutron water meter weekly during 2002 and once every five days during 2003. Fractional interception of PAR was also measured with a sunfleck ceptometer. Specific crop parameters including specific leaf area, the leaf stem partitioning parameter, maximum rooting depth and thermal time requirements for crop development were generated from field measurements. These data form the backbone for accurate mechanistic simulations of the soil-water balance. The model was successfully calibrated and evaluated, proving its potential to be used as a generic crop irrigation-scheduling tool. Highest seed and oil yield was harvested from the unstressed treatment and lowest from the treatment stressed during the flowering stage. Plant Production and Soil Science unrestricted 2013-09-07T12:49:15Z 2004-09-30 2013-09-07T12:49:15Z 2004-09-02 2005-09-30 2004-09-21 Dissertation Tesfamariam, E 2004, Modelling the soil water balance of canola Brassica napus L (Hyola 60), MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/28069 > http://hdl.handle.net/2263/28069 http://upetd.up.ac.za/thesis/available/etd-09212004-082030/ © 2004, 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 University of Pretoria |
| spellingShingle | Canola Soil water balance Modelling Deficite UCTD Modelling the soil water balance of canola Brassica napus L (Hyola 60) |
| title | Modelling the soil water balance of canola Brassica napus L (Hyola 60) |
| title_full | Modelling the soil water balance of canola Brassica napus L (Hyola 60) |
| title_fullStr | Modelling the soil water balance of canola Brassica napus L (Hyola 60) |
| title_full_unstemmed | Modelling the soil water balance of canola Brassica napus L (Hyola 60) |
| title_short | Modelling the soil water balance of canola Brassica napus L (Hyola 60) |
| title_sort | modelling the soil water balance of canola brassica napus l hyola 60 |
| topic | Canola Soil water balance Modelling Deficite UCTD |
| url | http://hdl.handle.net/2263/28069 http://upetd.up.ac.za/thesis/available/etd-09212004-082030/ |