Title page for ETD etd-11092005-153820


Document Type Master's Dissertation
Author Van der Westhuizen, Anna Maria
URN etd-11092005-153820
Document Title Influence of various storage conditions on rind breakdown and quality parameters in tangelo (Citrus reticulata Blanco x Citrus paradisi Macf.)
Degree MSc (Agric) Horticultural Science
Department Plant Production and Soil Science
Supervisor
Advisor Name Title
Dr E W Pavel Committee Chair
Keywords
  • tangelo quality storage conditions
Date 2002-04-01
Availability unrestricted
Abstract
Minneola tangelos were obtained from different production areas in two seasons (1996: Western Cape and Swaziland, 1997: Western and Eastern Cape), and stored at two different temperature regimes simulating the shipping and storage treatments of fruits for overseas markets to determine if storage regimes have an influence on quality parameters. Samples were taken every two weeks and quality parameters such as fruit shape index, mean rind thickness, % juice, %TSS, and % acid were determined. An experiment to determine weight loss during storage time was done at the same time. Main significant differences across all the parameters were observed between fruits from the different production areas, while fruit shape, % juice, and occurrence of rind breakdown did not differ significantly. In 1996, the weight loss developed in storage only showed a significant difference after 8 weeks in storage. In 1997, there was no clear pattern, but the interaction between producers and storage temperatures differed significantly. Focusing on the producer from the Western Cape, there was a significant difference between storage temperatures, confirming that citrus fruits stored at a higher temperature (11C) will loose moisture faster than those stored at a lower temperature (4.5C). Even with the higher moisture loss, there were no differences between the fruit stored at the different temperatures, apart from the difference between the producers indicating that changes in quality of 'Minneola' fruit are mainly determined by the producers and apparently to a lesser extent by storage temperatures of 4.5C and 11C. With the high rate of over-maturity developing in storage, it is possible that the fruit might have been stored too long. Therefore, the marketing period for soft citrus types is apparently too long and problems with physiological ageing can be abundant at this storage length.

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.

Please cite as follows:

Van der Westhuizen, AM 2001, Influence of various storage conditions on rind breakdown and quality parameters in tangelo (Citrus reticulata blanco x Citrus paradise Macf.), MSc(Agric) dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-11092005-153820/ >

H958/ag

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