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Nitrogen requirements for cabbage (brassica olerecea capitata) transplants and crop response to spacing and nitrogen top-dressing
Dissertation (M Inst Agrar (Horticulture))--University of Pretoria, 2005.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2013
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| _version_ | 1867613660151545856 |
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| access_status_str | Open Access |
| author2 | Soundy, Puffy |
| author_browse | Soundy, Puffy |
| author_facet | Soundy, Puffy |
| collection | Thesis |
| dc_rights_str_mv | © 2005, 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 (M Inst Agrar (Horticulture))--University of Pretoria, 2005. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/27918 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:40.578Z |
| 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:2263/27918 Nitrogen requirements for cabbage (brassica olerecea capitata) transplants and crop response to spacing and nitrogen top-dressing Soundy, Puffy Botha, Christelle Charle Semuli, Khabo Lemohang Harold Brassica oleracea var. capitata Top-dressing Nitrogen Spacing Transplant UCTD Dissertation (M Inst Agrar (Horticulture))--University of Pretoria, 2005. To determine the optimum nitrogen application level required for the production of good quality ‘Drumhead’ cabbage (Brassica oleracea var. capitata) transplants, a glasshouse experiment was conducted. Depending on water requirements, transplants were fertigated every two days (for the first four weeks) and every day (for the last two weeks) by floating trays in plastic tubs containing nutrient solution at 0, 30, 60, 90 and 120 mg•L-1 N until field capacity was reached. Increasing nitrogen from 0 to 120 mg•L-1 increased shoot and root mass of cabbage transplants with more dry mass being partitioned to the shoot than to the roots. Nitrogen at 120 mg•L-1 N produced greatest fresh and dry shoot mass, plant height, leaf area, leaf tissue nitrogen, net assimilation rate, relative growth rate and leaf mass ratio. Nitrogen at 90 mg•L-1 improved dry root mass, pulling success, specific leaf area and leaf area ratio. Greatest values of root: shoot ratio and root mass ratio were obtained at 0 mg•L-1 N. Nitrogen at 90 mg•L-1 was best as it produced transplants with more vigorous root growth which pulled out easily from the seedling trays. To determine the best combination of spacing and nitrogen top-dressing for improved cabbage production under local conditions, a field experiment was conducted. Cabbage ‘Copenhagen Market’ transplants were spaced at 30 x 50 cm, 40 x 50 cm or 50 x 50 cm and fertilized with nitrogen as top-dressing at 50, 100 or 150 kg•ha-1 N applied in two splits (fourth and eighth week after transplanting). There were no interactions between spacing and nitrogen top-dressing for all measured variables. Nitrogen and spacing did not influence dry matter production and leaf tissue nitrogen. Furthermore, spacing did not affect core height and yield (per unit area) of trimmed cabbage heads. Nitrogen at 100 kg•ha-1 produced the greatest head mass and yield for untrimmed cabbage heads. The 30 x 50 cm spacing produced the highest yield of untrimmed heads while 50 x 50 cm spacing produced heavier heads. For trimmed heads, 100 kg•ha-1 N again produced the greatest head mass, head diameter, head height, core diameter and yield. Spacing did not affect the yield for trimmed heads. However, 40 x 50 cm spacing improved head diameter, head height and head mass while core diameter was larger with 50 x 50 cm spacing. The split application of 100 kg•ha-1 N as top-dressing was best for head mass and yield (per unit area) for trimmed and untrimmed heads. Choice of spacing would depend on whether trimmed or untrimmed heads are targeted. Plant Production and Soil Science unrestricted 2013-09-07T12:36:43Z 2006-02-10 2013-09-07T12:36:43Z 2005-06-21 2005 2006-02-10 Dissertation Semuli, K 2005, Nitrogen requirements for cabbage (brassica olerecea capitata) transplants and crop response to spacing and nitrogen top-dressing, M dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/27918> http://hdl.handle.net/2263/27918 http://upetd.up.ac.za/thesis/available/etd-02102006-161946/ en © 2005, 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 | Brassica oleracea var. capitata Top-dressing Nitrogen Spacing Transplant UCTD Nitrogen requirements for cabbage (brassica olerecea capitata) transplants and crop response to spacing and nitrogen top-dressing |
| title | Nitrogen requirements for cabbage (brassica olerecea capitata) transplants and crop response to spacing and nitrogen top-dressing |
| title_full | Nitrogen requirements for cabbage (brassica olerecea capitata) transplants and crop response to spacing and nitrogen top-dressing |
| title_fullStr | Nitrogen requirements for cabbage (brassica olerecea capitata) transplants and crop response to spacing and nitrogen top-dressing |
| title_full_unstemmed | Nitrogen requirements for cabbage (brassica olerecea capitata) transplants and crop response to spacing and nitrogen top-dressing |
| title_short | Nitrogen requirements for cabbage (brassica olerecea capitata) transplants and crop response to spacing and nitrogen top-dressing |
| title_sort | nitrogen requirements for cabbage brassica olerecea capitata transplants and crop response to spacing and nitrogen top dressing |
| topic | Brassica oleracea var. capitata Top-dressing Nitrogen Spacing Transplant UCTD |
| url | http://hdl.handle.net/2263/27918 http://upetd.up.ac.za/thesis/available/etd-02102006-161946/ |