Studies on soil acidity management strategies for sustainable agriculture
- Authors: Swart, Nicolas
- Date: 2024-12
- Subjects: Soil acidity , Soil fertility , Sustainable agriculture
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/69475 , vital:77260
- Description: Soil acidity is a widespread problem which reduces plant growth and yield. There are calls for alternative crop and soil management strategies that can be used by farmers to deal with soil acidification in a sustainable manner. Current literature suggests that the benefits of sustainable soil management systems on soil acidity are highly variable, and within the context of conservation agriculture (CA), farmers need recommendations for techniques to improve liming efficiency. Such techniques include acid resistant cultivars and soil amendments such as biochar. However, dedicated scientific research is still needed to increase our understanding of the benefits of integrating various sustainable agriculture approaches on reducing the acidity on cropped lands. A series of experiments were thus conducted to test whether the integration of reduced lime dosages with organic amendments such as biochar, along with acid resistant wheat cultivars could improve nutrient availability and reduce the harms of acidity on plant roots. It was hypothesised that if lower than recommended doses of lime are applied in combination with biochar and acid resistant cultivars, there will be significant improvement of nutrient availability, soil acidity amelioration benefits and crop growth. The first experiment was a 60–day incubation trial to examine the interaction effects of reduced lime application rates and black wattle (Acacia mearnsii) biochar on the acidity and plant nutrient availability of a sandy clay loam, acidic podzolic soil. The changes in pH water (pHw) across treatments were monitored at 10-day intervals over the incubation period. Additionally, the initial and final status of each treatment in terms of essential macro-and micronutrients, pH(KCl), extractable aluminium (ext Al), exchangeable acidity (EA) and acid saturation (AS) were also measured. The second experiment examined the genotype × biochar × lime interaction effects on wheat plant root growth in the acid soil. Soil incubation results showed that the interaction effect of lime rate and biochar was not significant (p>0.05) for any of the tested soil nutrient availability and soil acidity parameters, except for pHw. However, lime rate effects were significant (p<0.05) on AS, EA, pH(KCl) and ext Al. As lime rate increased, the acidity decreased. Increasing the lime application rate significantly (p<0.05) enhanced the cation exchange capacity (CEC), calcium (Ca), magnesium (Mg) and phosphorous (P), but decreased potassium (K) and sulphur (S). The availability of micro-nutrients namely copper (Cu), iron (Fe), manganese (Mn) and zinc (Zn) also decreased as the lime rate increased. Biochar effects on EA, AS, pH(KCl) and ext Al were not significant (p>0.05). However, the biochar significantly reduced the availability of Ca and Mn but did not have a significant effecton all the other nutrients at the tested application rates. Unenriched biochar at 10 t ha-1 had an acidifying effect on the soil as it increased EA, when compared to enriched biochar. The significant (p <0.05) biochar × lime × time interaction effect on pHw showed that biochar applied without lime increased pHw, and the benefits were greatest at 10 t ha-1 biochar application rate. Similarly, lime applied without biochar also had a significant positive effect on pHw and the benefit increased at higher lime application rates. After 60 days of incubation, the lime applied at the highest rate of 5 t ha-1 without biochar (0 t ha-1 biochar) had the highest final pHw value. The 3-way interaction of lime, biochar and genotype was not significant (p>0.05). Koonap, the acid tolerant wheat variety outperformed the sensitive variety, Gariep under all treatments in the acid soil, as expected. There was, however, a significant (p<0.05) lime rate × biochar interaction. The highest application rates of lime (5 t ha-1) and biochar (10 t ha-1) were the best combination for root length for both the varieties. Overall, these results suggested a possible buffering effect of biochar at low lime application rates, thus limited benefits of combining reduced lime doses with biochar on reducing soil acidity or enhancing nutrient availability. The null hypothesis was thus rejected, and it was concluded that co-application of reduced lime rates and biochar will not significantly enhance benefits of liming. However, a positive interaction from co-application of biochar and lime on both pH and plant growth is possible at high application rates of both biochar and lime. , Thesis (MSc) -- Faculty of Science, School of Natural Resource Science and Management, 2024
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- Date Issued: 2024-12
The contribution of women to household food security in Makholokeong Village and Diyatalawa village, Free State Province
- Authors: Sihlangu, Nkhensani
- Date: 2023-12
- Subjects: Food security , Sustainable agriculture , Women -- family heads -- Developing countries
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/65957 , vital:74291
- Description: The study investigated the contribution of women to household food security in Makholokoeng village and Diyatalawa village, Free State Province. Women’s contribution to household food security is poorly documented and misunderstood. Most often women’s contribution is considered as part of the duties of women as a wife and mother than as an occupation to be vaunted for both the household and national economy. Women play crucial roles in household food security as food producers, processors, and food providers for their families. Despite these crucial roles women remain unrecognised as main contributors of household food security. The study was guided by pragmatic research philosophy that used Participatory Rural Appraisal tool amongst other data collection tools to answer the objectives of the study. The study findings show that there is a clear-cut of the agricultural roles men and women perform in agriculture but the involvement of women in decision-making varies with crops and the type of household. The contribution of women to household food security is evident. However, women continue to face challenges which are limiting the role of women in household food security. The study recommends that further studies should be conducted to investigate gender roles in agriculture; and the effectiveness of gender equality policy implementation in agricultural initiatives. , Thesis (MA) -- Faculty of Business and Economic Sciences, School of Economics, Development and Tourism, 2023
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- Date Issued: 2023-12
Effect of social capital and information acquisition on the adoption and benefits of conservation agriculture among cassava and maize smallholder farmers in South-West Nigeria
- Authors: Olawuyi, Seyi Olalekan
- Date: 2019
- Subjects: Agricultural conservation , Sustainable agriculture , Farms, Small
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/15200 , vital:40200
- Description: Sustainable economic growth and development in developing economy like Nigeria is achievable through the agricultural sector and sub-sectors which are concentrated in rural areas. Rural areas represent a home to majority (about 75%) of the households practicing farming for family sustenance and/or to earn income from the sales of agricultural products (Oyakhilomen and Zibah, 2014). In addition to the persistent use of traditional farming practices, these rural farming households cultivate crops varieties that are low-yielding on small and scattered farmland holdings (smallholder farmers) (Oyakhilomen and Zibah, 2014). This act depletes the soil organic matter with devastating consequences on production output, income generation as well as the ecosystem. Similarly, non-access to agricultural credit and limited technical knowhow are parts of the challenges that are facing the development of farming activities in subSaharan Africa, including Nigeria (Kassie, Pender, Yesuf, Köhlin, Bluffstone and Mulugeta, 2008). These challenges call for holistic interventions such as conservative agricultural practices; which are sustainable, promote safe environment and ultimately increase production output.
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- Date Issued: 2019
Indigenous knowledge for agricultural development: a framework for potato farming in Bui division, North West Region of Cameroon
- Authors: Ngek, Shillie Peter
- Date: 2018
- Subjects: Agriculture -- Economic aspects -- Cameroon -- Bui , Agricultural industries -- Cameroon , Sustainable agriculture , Sustainable development , Indigenous peoples
- Language: English
- Type: Thesis , Doctoral , DBA
- Identifier: http://hdl.handle.net/10948/33703 , vital:32974
- Description: Over the years, people have planned and carried out their activities depending on their indigenous knowledge base. In agriculture, documented importance of indigenous knowledge has been noted in different ways such as in crop health management, soil nutrient management, and food processing and food preservation. Indigenous smallholder farmers across the world have developed techniques that reflect their intimate knowledge of their local environments and ecosystems to improve their agricultural yields and minimise postharvest losses. However, such indigenous knowledge techniques are rarely documented or enhanced to boost agricultural practice and ensure food security. The present study has identified potato farming in Cameroon as a potential contributor to the socio-economic development of farmers, their communities and their country. The potato farming industry largely consists of smallholder farmers, predominantly women, producing primarily of immediate consumption. Historically, these farmers have been sustaining their farms through indigenous knowledge and practices that are not being exploited to the fullest beneficial opportunities for these farmers. It has often been suggested that Western highly mechanised approaches should be implemented to commercialise these farms in order to access these benefits. These approaches of mechanisation require large capital outlays, which these smallholder farmers cannot afford, hence the approach taken by the present study to capitalise on the indigenous knowledge and practices of these farmers. The present study argued that working with the existing indigenous knowledge and practices of these farmers, a level of commercialisation, with the resulting job creation and economic benefits, could be achieved. This study has succeeded in identifying the causes of postharvest potato losses on the smallholding farms, the obstacles in reducing these losses and the techniques to reduce these losses. The study provides important recommendations to improve smallholder potato farming in Cameroon. By implementing the findings of this study, the Cameroon government, prospective potato farmers, entrepreneurs, traditional authorities and NGOs could make a significant contribution to the improvement of socio-economic conditions and the reduction of poverty levels in these farming communities.
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- Date Issued: 2018
Media and communication influences on farmers' views of water conservation in the Garden Route, South Africa
- Authors: Buckle, Dorothea Maria
- Date: 2016
- Subjects: Water-supply, Agricultural -- South Africa , Sustainable agriculture , Mass media in agricultural extension work
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/9109 , vital:26465
- Description: The Garden Route is situated between a mountain range and the ocean, both within close proximity. These geographic considerations make the farmers in the area vulnerable to extreme weather events, especially droughts and floods, which have been experienced in recent years. Agriculture in the area is predominantly focused on dairy and vegetables, which require intensive irrigation practices. It is this water demand that inspired adaptations to counteract the risks of extreme weather and dwindling water sources. These adaptations and behaviours were investigated to determine the underlying perceptions and influences. The research aimed to understand the way environmental knowledge would disseminate through the use of the Diffusion of Innovation theory, whilst determining the ecological worldviews of the participants through the use of the New Ecological Paradigm (NEP) scale. Both of these theories proved effective in researching the ecological perceptions of and various influences on the participants, with a few minor drawbacks. The data analysis investigated the research questions with a three-pronged approach. Interpersonal interviews and media content analysis of the local and agricultural media in the area was followed by analysing the two sets of findings, in order to find overlaps and relationships between the factors explored. The interviews were designed as semi-structured to allow for themes to emerge and were conducted mainly within the diary and beef industries, consisting of 24 participants. The media content analysis incorporated a niche agricultural magazine (32 articles) as well as the local newspaper (74 articles). The articles were coded for themes to allow for comparison between the two, and to provide an overall understanding of the media coverage. The use of the interviews and media content analysis concurrently, made it possible to determine the farmers’ perceptions of water conservation and the possible influences on these. By exploring this, the research endeavours to understand the dynamics between the farmers’ use of media and interpersonal networks and their water conservation practices. The farmers’ perceptions appeared to be predominantly shaped by agricultural media and interpersonal communities. The NEP scale responses exposed the clash between economic and environmental considerations. The farmers were acutely aware of their ecological impact and were employing various measures to counteract it. However, these were heavily dependent on their financial situation. This is in contrast to the NEP scale’s measuring of NEP statements contrasted with Dominant Social Paradigm (DSP) statements to determine ecological attitudes. These findings confirm previous research and demonstrate that modern farmers are more likely to adopt conservation practices than their traditional counterparts, if it helps achieve their economic, social and environmental goals. The importance of the historical context of South Africa’s water issues emerged, with the past and future proposed changes to water regulation and legislation affecting farmers’ perceptions. The move from agriculturally privileged water legislation to equitable distribution is affecting the farmers negatively, causing distrust towards the government. The research was successful in achieving an understanding of the effect of the mass media and interpersonal communication influences on the farmers’ perceptions of water conservation.
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- Date Issued: 2016