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| Registros recuperados: 333 | |
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| De Groote, Hugo; Kimenju, Simon Chege; Owuor, George; Wanyama, Japheter. |
| This study analyses the impact of the liberalization on the intensification of maize production in Kenya. It first analyses the impact of liberalization on input and output prices, followed by an analysis of farmer practices comparing two major farmer surveys, from 1992 and 2002. The results show that liberalization has had a general positive impact on the evolution of prices, with a decrease of input/output price ratios. However, fluctuations of maize prices has become very high and, combined with a decrease of marketing by the marketing board, has increased the uncertainty in maize production. The liberalization has also resulted in a decrease in extension services. Fortunately, farmers have an increased access to credit services. The combined effect of... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Liberalization; Intensification; Adoption; Maize; Africa; International Development; International Relations/Trade. |
| Ano: 2006 |
URL: http://purl.umn.edu/25419 |
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| Diao, Xinshen; Dorosh, Paul A.; Rahman, Shaikh Mahfuzur. |
| In today’s more integrated world economy, agricultural growth in Africa depends not only on raising productivity and increasing production, but on increasing the competitiveness of African agriculture in the global market and expanding its market opportunities within Africa. Unless demand increases, African agriculture cannot grow at a rate sufficient to reduce poverty and hunger to any substantial degree. The accelerated economic growth in Africa in recent years might offer increased opportunities for agriculture from domestic demand. This research report focuses on demand-side constraints on African agricultural growth and their implications for three broad agricultural development strategies: promoting traditional exports, developing nontraditional... |
| Tipo: Report |
Palavras-chave: Agriculture; Africa; International trade; International Development. |
| Ano: 2007 |
URL: http://purl.umn.edu/37877 |
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| Veldman, S.. |
| Medicinal plants are an important source of primary healthcare for many people in Tanzania. These medicinal plants are harvested from the wild, and increasing commercial trade poses a serious threat to local plant populations. Currently it is unknown which species are traded and in what amounts. Across the southwestern border in Zambia, the traditional dish chikanda has transformed from a niche product to being a mainstream delicacy. One of the main ingredients are wild-harvested orchids, and these have become depleted throughout the country as an effect of the increased trade. It is unclear which orchid species are targeted and might be at risk of overharvesting. The aims of my doctorate are to map harvest and trade of Tanzanian medicinal plants and... |
| Tipo: Book (monograph) |
Palavras-chave: DNA barcoding; Africa; Species delimitation; Orchids; Medicinal plants. |
| Ano: 2018 |
URL: http://www.repository.naturalis.nl/record/668031 |
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| Owusu, Victor; Owusu, Michael Anifori. |
| This paper examines the market potential for fresh organic lettuce and water melon with a recently collected data on consumers from Kumasi metropolis of Ghana. Using a doublebounded dichotomous choice contingent valuation technique, consumer’s willingness to pay is estimated with a Tobit model to address the zero willingness to pay responses in the sample data. As much as 71% of the consumers are willing to pay over 50% price premiums for organic vegetables and over 82% are willing to pay 1%–50% price premiums for organic fruits. The empirical results indicate that human capital, product attributes and consumer perception influence consumers’ willing to pay for organic food products. The estimated market potential for organic fruit is GH¢32,117,113 (US$... |
| Tipo: Journal Article |
Palavras-chave: Willingness to Pay; Price Premium; Organic Products; Consumer Perception; Market Potential; Africa; Crop Production/Industries. |
| Ano: 2010 |
URL: http://purl.umn.edu/95955 |
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| Mather, David; Donovan, Cynthia; Boughton, Duncan. |
| This brief summarizes detailed analysis of the determinants of household crop income in rural Mozambique from 2002 to 2005. Increased crop income is associated with increases in household land area, use of animal traction, crop diversification into tobacco or cotton, access to market price information, and access to extension agents (for tobacco/cotton growers). Decreases in crop income are associated with drought. Results demonstrate that there are both public and private investments that can enhance farmers’ ability to increase crop income and avoid losses. Priority investments include: development and dissemination of drought-resistant varieties for maize and cassava, conservation farming, animal traction, market information, access to high-value crops... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agriculture; Africa; Mozambique; Food security; Assets; Household; Rural; Agricultural and Food Policy; Community/Rural/Urban Development; Consumer/Household Economics; Food Security and Poverty; International Development; Q12. |
| Ano: 2009 |
URL: http://purl.umn.edu/56805 |
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| Mather, David; Donovan, Cynthia; Boughton, Duncan. |
| This brief summarizes detailed analysis of the determinants of household crop income in rural Mozambique from 2002 to 2005. Increased crop income is associated with increases in household land area, use of animal traction, crop diversification into tobacco or cotton, access to market price information, and access to extension agents (for tobacco/cotton growers). Decreases in crop income are associated with drought. Results demonstrate that there are both public and private investments that can enhance farmers’ ability to increase crop income and avoid losses. Priority investments include: development and dissemination of drought-resistant varieties for maize and cassava, conservation farming, animal traction, market information, access to high-value crops... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agriculture; Africa; Mozambique; Food security; Assets; Household; Rural; Agricultural and Food Policy; Community/Rural/Urban Development; Consumer/Household Economics; Food Security and Poverty; International Development; Q12. |
| Ano: 2009 |
URL: http://purl.umn.edu/56804 |
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| Kiboi, M. N.; Ngetich, K. F.; Mugendi, D. N.; Muriuki, A.; Adamtey, N.; Fliessbach, A.. |
| Soil biological properties are the most sensitive soil quality indicators that respond quickly to short-term soil fertility management changes. We studied the combined effects of tillage and soil external inputs on total soil organic carbon and nitrogen, microbial biomass carbon (MBC) and nitrogen (MBN) and acid phosphomonoesterase activity (ACP). This was done in Meru South and Kandara sub-counties in Kenya for three consecutive cropping seasons. Tillage was the main factor [minimum (D0) and conventional (D15)], and soil external inputs were the sub-factors: sole mineral fertiliser (F), crop residues + mineral fertiliser (RF), crop residues + animal manure + legume intercrop Dolichos lablab L. (RML), crop residues + mineral fertiliser + animal manure... |
| Tipo: Journal paper |
Palavras-chave: Farming Systems; Soil biology; Africa; Farm nutrient management. |
| Ano: 2018 |
URL: http://orgprints.org/34443/2/1-s2.0-S2352009418301366-main.pdf |
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| Castaneda, Isla S.; Caley, Thibaut; Dupont, Lydie; Kim, Jung-hyun; Malaize, Bruno; Schouten, Stefan. |
| In this study we investigate Pleistocene vegetation and climate change in southern East Africa by examining plant leaf waxes in a marine sediment core that receives terrestrial runoff from the Limpopo River. The plant leaf wax records are compared to a multi-proxy sea surface temperature (SST) record and pollen assemblage data from the same site. We find that Indian Ocean SST variability, driven by high-latitude obliquity, exerted a strong control on the vegetation of southern East Africa during the past 800,000 yr. Interglacial periods were characterized by relatively wetter and warmer conditions, increased contributions of C3 vegetation, and higher SST, whereas glacial periods were marked by cooler and arid conditions, increased contributions of C4... |
| Tipo: Text |
Palavras-chave: Vegetation; Africa; N-alkane; Pollen; Subtropical Front; Mid-Brunhes. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00345/45601/45215.pdf |
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| Tschirley, David L.; Ayieko, Miltone W.; Hichaambwa, Munguzwe; Goeb, Joey; Loescher, Wayne. |
| After a burst of enthusiasm through the middle part of this decade regarding the supermarket revolution, there now exists a broad consensus that this phenomenon is likely to proceed much more slowly than once thought in Sub-Saharan Africa. This is especially true in fresh produce supply chains, where both the promise and the perils of supermarket expansion have received greatest attention. In nearly the entire continent, the so-called traditional marketing sector – open air markets, dispersed informal vendors, and traditional shops – is expected to play a dominant role in fresh produce marketing for several decades. If true, this finding has profound policy implications. Specifically, it suggests that private investment in modern, integrated supply chains... |
| Tipo: Report |
Palavras-chave: Marketing; Africa; Agribusiness; Food Security and Poverty; International Relations/Trade; Marketing. |
| Ano: 2010 |
URL: http://purl.umn.edu/93030 |
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| Maas-van de Kamer, H.; Maas, P.J.M.; Wieringa, J.J.; Specht, C.D.. |
| A taxonomic revision of the African genera of Costaceae (Costus and Paracostus) is given. Within the genus Costus 24 species are recognized, 8 of which are here described as new and one is given a new name. Included are chapters on the history of the taxonomy of the family, morphology, flower biology, pollination, dispersal, distribution, ecology, phylogeny and molecular studies and conservation. The species treatments include descriptions, full synonymy, geographical and ecological notes and taxonomic notes. For all species distribution maps are provided. A complete identification list with all exsiccatae studied and an index to scientific names is included at the end. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Africa; Costus; History; Morphology; Paracostus; Phylogeny; Taxonomy. |
| Ano: 2016 |
URL: http://www.repository.naturalis.nl/record/621671 |
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| Simasiku, Phyllis; Chapoto, Antony; Richardson, Robert B.; Sichilongo, Mwape; Tembo, Gelson; Weber, Michael T.; Zulu, Alimakio. |
| Natural resource use, including land, and rural population location is an important topic for Zambia's development strategy. Among other efforts, the Government of Zambia (GRZ) has designated 22% of total land area, as Game Management Areas (GMAs) for human settlements and wildlife conservation. Other GRZ programmes seek to improve food security and agricultural productivity, including the use and improvement of conservation farming techniques. GRZ is currently reviewing policies in the agricultural, forestry, fisheries, wildlife and land sectors. Research in these fields has much to contribute to effective management of MAs, increased agricultural productivity and improved welfare, especially for the rural population. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Zambia; Africa; Natural resources management; GMA; Wildlife management policies; Agricultural and Food Policy; Environmental Economics and Policy; Food Security and Poverty; International Development; Q34. |
| Ano: 2010 |
URL: http://purl.umn.edu/58518 |
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| Musyoka, Martha W.; Adamtey, Noah; Muriuki, Anne W.; Bautze, David; Karanja, Edward N.; Mucheru-Muna, Monica; Fiaboe, Komi K.M.; Cadisch, Georg. |
| Organic farming has been proposed as a solution to foster agricultural sustainability and mitigate the negative environmental impacts of conventional farming. This study assessed N losses and soil surface N balances in conventional and organic farming systems in a sub-humid and semi-humid (Chuka and Thika) sites in Kenya. Nitrate–N (NO3−–N) leached was trapped at 1 m depth using the Self Integrating Accumulator core method and the changes in mineral-N were assessed at different soil depths and different crop growth stages. Both conventional and organic farming systems lost substantial amounts of NO3−–N at the early growth stages of all the crops. Cumulative NO3−–N leached was similar in all the farming systems in each cropping season. More NO3−–N was... |
| Tipo: Journal paper |
Palavras-chave: Air and water emissions; Africa. |
| Ano: 2019 |
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| Musyoka, Martha W.; Adamtey, Noah; Bünemann, Else K.; Muriuki, Anne W.; Karanja, Edward N.; Mucheru-Muna, Monica; Fiaboe, Komi K.M.; Cadisch, Georg. |
| To match Nitrogen (N) supply to crop N demand, it is essential to understand N release and uptake patterns in different farming systems and crops. To assesses the dynamics of N released in organic and conventional systems and potential synchrony and asynchrony in crop N uptake, a study was conducted over three cropping seasons (potato, maize and leafy vegetables) at two sites in the Central Highlands of Kenya. Mineral-N release and synchrony were monitored in conventional and organic systems at high (recommended N, P, pesticides and irrigation) and low input (low N, P, pesticide use and rainfed) systems. Mineral-N release was assessed using in situ buried bags and N synchrony was measured by the daily differences in N fluxes. The percentage of N applied... |
| Tipo: Journal paper |
Palavras-chave: Soil quality; Composting and manuring; Africa. |
| Ano: 2019 |
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| Bruggen, A.C. van; Winter, A.J. de. |
| Micractaeon kakamegaensis Verdcourt, 1993 (type loc. Kenya, Kakamega Forest), is a synonym of Pseudopeas koptawelilense Germain, 1934 (type loc. Kenya, Mt. Elgon); the proper name is therefore Micractaeon koptawelilensis (Germain, 1934). New anatomical data are supplied, more or less confirming classification in the family Ferussaciidae. The shell is subject to some considerable variation in size, shape and sculpture. The species appears to be widely distributed in various types of forest in tropical Africa (Ghana, Cameroon, eastern and south-eastern Zaïre, Kenya, Malawi, and eastern Zambia); hypsometrical distribution is generally from c. 950 m to c. 2300 m, although in Ghana it has been collected at altitudes of between < 250 and c. 700 m. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Gastropoda; Pulmonata; Ferussaciidae; Micractaeon; Africa; Ghana; Cameroon; Zaïre; Kenya; Zambia; Mala?i; Taxonomy; Distribution; 42.73. |
| Ano: 1995 |
URL: http://www.repository.naturalis.nl/record/319133 |
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| Registros recuperados: 333 | |
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