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Interactive effects of a calcium and magnesium sulphate enriched waste water on crop growth and nutrition
Dissertation (MSc (Plant Production and Soil Science))--University of Pretoria, 2007.
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University of Pretoria
2013
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| _version_ | 1867613472709148672 |
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| access_status_str | Open Access |
| author2 | Claassens, Andries Stephanus |
| author_browse | Claassens, Andries Stephanus |
| author_facet | Claassens, Andries Stephanus |
| collection | Thesis |
| dc_rights_str_mv | © 2001 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 (Plant Production and Soil Science))--University of Pretoria, 2007. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/23599 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:36:41.872Z |
| 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:2263/23599 Interactive effects of a calcium and magnesium sulphate enriched waste water on crop growth and nutrition Claassens, Andries Stephanus upetd@up.ac.za Annandale, John George Strohmenger, Petronella Hermina Elizabeth Calcium fertilizers Saline waters crops effects on Crops effects of minerals on Magnesium fertilizers. UCTD Dissertation (MSc (Plant Production and Soil Science))--University of Pretoria, 2007. The coal industry of Mpumalanga Province is faced with the problem of developing cost effective ways of using large volumes of calcium and magnesium sulphate enriched waste waters. Use of the waste waters for agricultural production may contribute as a stabilising factor with regard to yields in this high potential agricultural area. The objectives of this study were to determine the effect of such waste waters on yield and to compare crop response to calcium and magnesium sulphate salinity at different nutrient levels. Two separate glasshouse experiments were conducted. Wheat (Triticum aestivum L. cv. SST 825) was grown in calcium and magnesium sulphate salinised nutrient solutions (Ca:Mg 2: 1) with differential levels of NO3, NH4, P and K. A soil pot experiment was subsequently conducted with maize (Zea mays, cv. PAN 6256), three gypsum and magnesium sulphate salinity levels and a 6 x 2 x 3 factorial combination of N, P and K. Calcium and magnesium sulphate salinity decreased the biomass production of both crops. This was mainly due to interactions of Mg with the uptake of essential nutrients in wheat and a Mg toxicity andlor Ca deficiency induced by high levels of Mg andlor SO4 in maize. The application of NO3, NH4, and K at rates different from the level considered beneficial for non-saline conditions improved wheat growth under sulphate saline conditions. Strongly inhibitory salinity levels controlled the maize yield of the highest salinity treatment regardless of the level of fertiliser application. A beneficial effect of higher NH4 supply was observed in both experiments. This can be ascribed to the antagonistic effect that NH4 exerted on Mg concentrations in plants (both experiments) and SO4 (soil pot experiment) and/or to a higher N-utilization efficiency where N was supplied as NH4 compared to NO3. Differential application levels of P had no effect on the yield of wheat. Phosphorus concentrations in maize were marginal to low, even at extremely high soil Bray I-P levels. This was probably caused by the precipitation of P as insoluble calcium phosphate complexes in the soil andlor between the free space of the cortex cells of plant roots. These results could also indicate that the Bray I extraction method does not give a true reflection of plant available P in sulphate saline soil. Further experimentation is needed to verify these results under field conditions and determine the optimal rate, method and timing of especially NH4 and PO4 fertilisers when irrigating crops with these calcium and magnesium sulphate enriched waste waters. Plant Production and Soil Science unrestricted 2013-09-06T15:40:19Z 2006-04-07 2013-09-06T15:40:19Z 2001-02-17 2007-04-07 2006-03-30 Dissertation Strohmenger, PHE 2001, Interactive effects of a calcium and magnesium sulphate enriched waste water on crop growth and nutrition, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/23599 > H912/ag http://hdl.handle.net/2263/23599 http://upetd.up.ac.za/thesis/available/etd-03302006-123800/ © 2001 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 | Calcium fertilizers Saline waters crops effects on Crops effects of minerals on Magnesium fertilizers. UCTD Interactive effects of a calcium and magnesium sulphate enriched waste water on crop growth and nutrition |
| title | Interactive effects of a calcium and magnesium sulphate enriched waste water on crop growth and nutrition |
| title_full | Interactive effects of a calcium and magnesium sulphate enriched waste water on crop growth and nutrition |
| title_fullStr | Interactive effects of a calcium and magnesium sulphate enriched waste water on crop growth and nutrition |
| title_full_unstemmed | Interactive effects of a calcium and magnesium sulphate enriched waste water on crop growth and nutrition |
| title_short | Interactive effects of a calcium and magnesium sulphate enriched waste water on crop growth and nutrition |
| title_sort | interactive effects of a calcium and magnesium sulphate enriched waste water on crop growth and nutrition |
| topic | Calcium fertilizers Saline waters crops effects on Crops effects of minerals on Magnesium fertilizers. UCTD |
| url | http://hdl.handle.net/2263/23599 http://upetd.up.ac.za/thesis/available/etd-03302006-123800/ |