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You searched for +publisher:"University of KwaZulu-Natal" +contributor:("Van Niekerk, Renate"). Showing records 1 – 2 of 2 total matches.

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University of KwaZulu-Natal

1. [No author]. The development of a wall-less plug for planting stock of forest trees.

Degree: Forestry, 2013, University of KwaZulu-Natal

High output commercial nurseries that cater for the forestry industry are continuously challenged to efficiently and cost effectively produce good quality planting stock to establish large plantations. Currently, South African commercial nurseries produce planting stock in solid compartmentalized trays. One of the major drawbacks of these containers is the susceptibility of trees to root deformation following outplanting, combined with the need for the return of empty containers to the nursery. A potential solution to these challenges is the introduction of wall-less plugs for the production of planting stock. Wall-less plugs are volumes of growing medium, usually cylindrical in shape, devoid of an impenetrable wall in which a plant can grow and establish itself. Such plugs may enable the production of planting stock with improved root systems, without the need for the return of empty containers after outplanting. In this research four prototypes of wall-less plugs were developed, produced on a small scale and tested. These were: 1) Paper-maché plugs made using the original WRIBLOK protocol whereby composted pine bark was bound together with repulped newspaper, 2) Sponge blocks, 3) Hessian bags and 4) Covetan bags. The performance of these prototype wall-less plugs was compared with the performance of four tray types used commercially by the forestry industry: 1) Poly 128 shallow, 2) Poly 98 deep, 3) Unigro 128 and 4) Sappi 49. These are polystyrene and polypropylene-based containers. Of these containers the Unigro 128 and Sappi 49 containers were of similar performance. Performance in terms of height and root collar diameter increase over ten weeks from the time of sowing of the paper-maché plugs was similar to that of the Unigro and Sappi 49 containers. The sponge block, Hessian bags and Covetan bags produced inferior quality planting stock compared to the other treatments tested. Although little progress was made in the ability to describe how one root system differs from another in terms of their branching patterns, a technique was developed to determine root surface area by image analysis software that is freely available. This method may prove useful for further research and for determining seedling quality in commercial nurseries. Advisors/Committee Members: Van Niekerk, Renate (advisor), Da Costa, Dean (advisor).

Subjects/Keywords: Forests and forestry – South Africa.; Trees – Seedlings.; Plant plugs.; Forest nurseries.; Tree planting.; Trees – Propagation.; Roots (Botany) – Development.; Forestry.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

author], [. (2013). The development of a wall-less plug for planting stock of forest trees. (Thesis). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/9993

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

author], [No. “The development of a wall-less plug for planting stock of forest trees. ” 2013. Thesis, University of KwaZulu-Natal. Accessed December 07, 2019. http://hdl.handle.net/10413/9993.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

author], [No. “The development of a wall-less plug for planting stock of forest trees. ” 2013. Web. 07 Dec 2019.

Vancouver:

author] [. The development of a wall-less plug for planting stock of forest trees. [Internet] [Thesis]. University of KwaZulu-Natal; 2013. [cited 2019 Dec 07]. Available from: http://hdl.handle.net/10413/9993.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

author] [. The development of a wall-less plug for planting stock of forest trees. [Thesis]. University of KwaZulu-Natal; 2013. Available from: http://hdl.handle.net/10413/9993

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of KwaZulu-Natal

2. [No author]. Gladiolus scabridus - the road to conservation and commercialisation.

Degree: Horticultural science, 2005, University of KwaZulu-Natal

There is at present a growing concern and awareness of the endangered status of many indigenous South African plants in the wild, a number of which have potential for commercial production. One such example is Gladiolus scabridus, a vulnerable species endemic to the mountains of northern KwaZulu-Natal and southern Swaziland. It has considerable potential due to its floral characteristics. However, little is known about its horticultural requirements. Thus propagation and cultural practices were investigated with the aim of both conservation and commercialisation of the species. The ideal conditions for G. scabridus seed germination were determined. The presence or absence of light had no significant effect. Optimum germination was achieved at 20 QC of both winged and dewinged seeds. Higher temperatures appear to have a negative effect on germination and none of the winged seeds germinated at 30 QC. Under ideal conditions, fresh seed showed significantly higher vigour and viability than stored seed although the germination of stored seed was hampered by a higher internal fungal content. Successful tissue culture protocol was established for G. scabridus axillary bud and cormel halve explants. During the initial shoot initiation and proliferation stages (stage I and 11), the significantly higher shoot numbers occurred in the absence of growth regulators in both explant types. However, shoots with 1.0 mg 1 -1 6-benzyl-amino-purine (BAP) and 0.5 mg 1 -1 1-naphthalene-acetic-acid (NAA) were healthier in appearance. Higher levels of 5.0 mg 1 -1 NAA inhibited shoot production and encouraged root development in cormel halve explants. During stage 11, axillary bud explants showed root and cormlet development. More roots were initiated without growth regulators, whilst 5.0 mg 1 -1 NAA resulted in significantly better cormlet development. Shoot and cormlet growth of cormel halve explants during stage II was not significantly affected by the presence or absence of NAA and BAP. Significantly more roots were produced with 5.0 mg 1 -1 NAA. During stage III (rooting), the presence of activated charcoal (AC) was essential for the initiation and development of roots in vitro. Root and cormlet development in all explant types was significantly affected by the interaction between the previous treatments from stages I and 11 and the new treatments. During stage IV (hardening off) , most explants died down in the hardening off media leaving resting cormlets. There was a significant interaction between 1.0 mg 1 -1 NAA and 0.3 % AC from stage III, resulting in significantly more cormlets in both axillary bud and cormel halve explants. There was successful cormlet growth after cold storage which is advantageous in reducing the need for acclimatization. G. scabridus corms were successfully forced out of their normal flowering period. Temperatures of 10,5.5 and 2 QC showed successful corm initiation although the corms need to be stored for longer at warmer temperatures. It is suggested that a treatment of 2 QC… Advisors/Committee Members: Bower, John Patrick (advisor), Van Niekerk, Renate (advisor).

Subjects/Keywords: Gladiolus – KwaZulu-Natal.; Gladiolus – South Africa.; Gladiolus – KwaZulu-Natal – Growth.; Gladiolus – Physiology – KwaZulu-Natal.; Gladiolus – Conservation – KwaZulu-Natal.; Gladiolus – Propagation – KwaZulu-Natal.; Gladiolus – Postharvest physiology – KwaZulu-Natal.; Gladiolus – Postharvest technology – KwaZulu-Natal.; Cut flowers – KwaZulu-Natal – Marketing.; Endemic plants – KwaZulu-Natal.; Horticultural science.

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

author], [. (2005). Gladiolus scabridus - the road to conservation and commercialisation. (Thesis). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/4060

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

author], [No. “Gladiolus scabridus - the road to conservation and commercialisation. ” 2005. Thesis, University of KwaZulu-Natal. Accessed December 07, 2019. http://hdl.handle.net/10413/4060.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

author], [No. “Gladiolus scabridus - the road to conservation and commercialisation. ” 2005. Web. 07 Dec 2019.

Vancouver:

author] [. Gladiolus scabridus - the road to conservation and commercialisation. [Internet] [Thesis]. University of KwaZulu-Natal; 2005. [cited 2019 Dec 07]. Available from: http://hdl.handle.net/10413/4060.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

author] [. Gladiolus scabridus - the road to conservation and commercialisation. [Thesis]. University of KwaZulu-Natal; 2005. Available from: http://hdl.handle.net/10413/4060

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.