The sustainability of KwaZakhele's permaculture vegetable production project
- Authors: Jali, Sakhiwo
- Date: 2015
- Subjects: Permaculture Vegetable gardening
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/12138 , vital:27036
- Description: The current study aimed at investigating the sustainability of KwaZakhele's Permaculture Project and was conducted in the Eastern Cape Province within the Nelson Mandela Metro Municipality at Ward 22 according to Municipal Ward demarcations. The researcher was motivated to carry out this study due to the fact that many food production projects in the NMMM are not sustainable and thus contribute to food insecurity and a high rate of unemployment. The purpose of this study was to investigate the potential of permaculture projects in solving some of the food insecurity and unemployment issues in the NMMM. The KwaZakhele Permaculture Project (KPP) is a vegetable garden which produces different types of vegetables for marketing purposes and for household consumption. The KPP is supported financially by overseas-based organisations and have created ten direct work opportunities for KwaZakhele community. All the project members of the KPP are women. A qualitative research approach was employed in this study, with the emphasis of collecting primary data from the project participants as well as consulting secondary data from sources such as academic journals, books and government policy documents. The study reveals that permaculture design training and project monitoring are the most important developmental support permaculture projects need before and after implementation. The study also determined that the costs of establishing permaculture project can be higher or lower depending on the project size. Consultation and co-ordination fees account for a greater portion of the funding followed by permaculture infrastructure. The results of the study also indicate that permaculture design principles and ethics are seen as a strength for the sustainability of KPP.
- Full Text:
- Date Issued: 2015
- Authors: Jali, Sakhiwo
- Date: 2015
- Subjects: Permaculture Vegetable gardening
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/12138 , vital:27036
- Description: The current study aimed at investigating the sustainability of KwaZakhele's Permaculture Project and was conducted in the Eastern Cape Province within the Nelson Mandela Metro Municipality at Ward 22 according to Municipal Ward demarcations. The researcher was motivated to carry out this study due to the fact that many food production projects in the NMMM are not sustainable and thus contribute to food insecurity and a high rate of unemployment. The purpose of this study was to investigate the potential of permaculture projects in solving some of the food insecurity and unemployment issues in the NMMM. The KwaZakhele Permaculture Project (KPP) is a vegetable garden which produces different types of vegetables for marketing purposes and for household consumption. The KPP is supported financially by overseas-based organisations and have created ten direct work opportunities for KwaZakhele community. All the project members of the KPP are women. A qualitative research approach was employed in this study, with the emphasis of collecting primary data from the project participants as well as consulting secondary data from sources such as academic journals, books and government policy documents. The study reveals that permaculture design training and project monitoring are the most important developmental support permaculture projects need before and after implementation. The study also determined that the costs of establishing permaculture project can be higher or lower depending on the project size. Consultation and co-ordination fees account for a greater portion of the funding followed by permaculture infrastructure. The results of the study also indicate that permaculture design principles and ethics are seen as a strength for the sustainability of KPP.
- Full Text:
- Date Issued: 2015
Bioaccumulation and ecotoxicology of b-methylamino-l-alanine (BMAA) in model crop plants
- Niyonzima, Francois Niyongabo
- Authors: Niyonzima, Francois Niyongabo
- Date: 2010
- Subjects: Cyanobacteria , Environmental toxicology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10312 , http://hdl.handle.net/10948/1475 , Cyanobacteria , Environmental toxicology
- Description: Cyanobacteria are known to produce a variety of toxic compounds. β-N-methylamino-L-alanine (BMAA) is one of the neurotoxins produced by most cyanobacteria. BMAA has been implicated in amyotrophic lateral sclerosis / Parkinsonism dementia complex (ALS / PDC) and was suggested to contribute to this pathology after biomagnification and slow release of BMAA from a protein associated form. The uptake and accumulation of BMAA by the aquatic macrophyte Ceratophyllum demersum has recently been shown, but the consumption of aquatic macrophytes by humans is not typical. The uptake by, and accumulation in, crop plants (Nasturtium officinale and Daucus carota) was therefore investigated so as to establish the existence of any risk to humans from the consumption of plants irrigated with water from dams with high cyanobacterial biomass and therefore high BMAA levels. After the exposure to the BMAA through the growth medium, BMAA had no effect on growth and development of N. officinale and D. carota. The uptake and bioaccumulation of BMAA was observed in N. officinale and D. carota, and was found to be concentration-dependent. Both free and bound cellular BMAA was detected following BMAA exposure through the growth medium. The photosynthetic apparatus of N. officinale was not significantly damaged. The uptake and accumulation of BMAA in edible terrestrial plants may constitute another route of human exposure to BMAA; it may now be prudent to avoid spray irrigation of edible plants with waters from dams with high cyanobacterial biomass and therefore high BMAA levels. After uptake by plants, the cyanotoxins may induce oxidative stress. A recent study showed that BMAA has a significant inhibitory effect on the oxidative stress enzymes in C. demersum. Therefore, the toxicological effects on selected plants were investigated by a range of biochemical enzyme assays in order to establish the plant stress response to exogenous BMAA. The inhibition of antioxidant enzymes upon exposure of N. officinale to BMAA through the growth medium was observed. The inhibition of antioxidant defence enzymes by BMAA correlated with the BMAA bioaccumulation in N. officinale. Further investigations are needed to analyze the uptake, accumulation, and ecotoxicology of BMAA in other crop plants, and to examine the fate of BMAA in these plants particularly its distribution and metabolism.
- Full Text:
- Date Issued: 2010
- Authors: Niyonzima, Francois Niyongabo
- Date: 2010
- Subjects: Cyanobacteria , Environmental toxicology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10312 , http://hdl.handle.net/10948/1475 , Cyanobacteria , Environmental toxicology
- Description: Cyanobacteria are known to produce a variety of toxic compounds. β-N-methylamino-L-alanine (BMAA) is one of the neurotoxins produced by most cyanobacteria. BMAA has been implicated in amyotrophic lateral sclerosis / Parkinsonism dementia complex (ALS / PDC) and was suggested to contribute to this pathology after biomagnification and slow release of BMAA from a protein associated form. The uptake and accumulation of BMAA by the aquatic macrophyte Ceratophyllum demersum has recently been shown, but the consumption of aquatic macrophytes by humans is not typical. The uptake by, and accumulation in, crop plants (Nasturtium officinale and Daucus carota) was therefore investigated so as to establish the existence of any risk to humans from the consumption of plants irrigated with water from dams with high cyanobacterial biomass and therefore high BMAA levels. After the exposure to the BMAA through the growth medium, BMAA had no effect on growth and development of N. officinale and D. carota. The uptake and bioaccumulation of BMAA was observed in N. officinale and D. carota, and was found to be concentration-dependent. Both free and bound cellular BMAA was detected following BMAA exposure through the growth medium. The photosynthetic apparatus of N. officinale was not significantly damaged. The uptake and accumulation of BMAA in edible terrestrial plants may constitute another route of human exposure to BMAA; it may now be prudent to avoid spray irrigation of edible plants with waters from dams with high cyanobacterial biomass and therefore high BMAA levels. After uptake by plants, the cyanotoxins may induce oxidative stress. A recent study showed that BMAA has a significant inhibitory effect on the oxidative stress enzymes in C. demersum. Therefore, the toxicological effects on selected plants were investigated by a range of biochemical enzyme assays in order to establish the plant stress response to exogenous BMAA. The inhibition of antioxidant enzymes upon exposure of N. officinale to BMAA through the growth medium was observed. The inhibition of antioxidant defence enzymes by BMAA correlated with the BMAA bioaccumulation in N. officinale. Further investigations are needed to analyze the uptake, accumulation, and ecotoxicology of BMAA in other crop plants, and to examine the fate of BMAA in these plants particularly its distribution and metabolism.
- Full Text:
- Date Issued: 2010
- «
- ‹
- 1
- ›
- »