OALib Journal期刊

ISSN: 2333-9721



匹配条件: “Asaah” ,找到相关结果约4条。
Modelling Options for Policy Impact Analysis on African Dairy Farms
Oghaiki Asaah NDAMBI
Annals of Dun?rea de Jos University. Fascicle I : Economics and Applied Informatics , 2008,
Abstract: Studies on the priorities for agricultural research in Eastern and CentralAfrica concluded that milk is the most important commodity for research anddevelopment in the region, based on its potential contribution to the agriculturalGDP. It has been presumed that, the right policies, marketing systems and technicalsupport must be sought for dairy development in Africa. In order to determine theright development pattern, appropriate analytical tools must be applied. The TIPICAL(Technology Impact Policy Impact model) was used to analyse the impact ofdifferent policies on two typical dairy farming systems in Uganda, which accountfor more than 70% of milk produced in the country. Seven influential policy areaswere also identified: provision of veterinary services, consumption promotion,marketing promotion, input provision, credit access improvement, milk qualityimprovement and genetic improvement. In general, the policy impacts are very littleon farms with local cows but can be magnified up to threefold, if the farms havegraded cows. Policies which improve farmers’ accessibility to markets have thegreatest impacts. The results obtained from this model were compared to thoseusing the EXTRAPOLATE model. This comparison shows that both models couldcomplement each other in analysing policy impacts on African dairy farms.However, differences in results from the models indicate that more focus should bemade on farmers’ willingness to adopt new technology.
Beyond vegetative propagation of indigenous fruit trees: case of Dacryodes edulis (G. Don) H. J. Lam and Allanblackia floribunda Oliv.
Asaah, Ebenezar K.,Tchoundjeu, Zac,Van Damme, Patrick
Afrika Focus , 2012,
Abstract: Indigenous fruits/nuts of Africa’s humid tropics are increasingly being recognized for their contribution to food security, health (nutrition/medicine), income generation, employment and environmental benefits. However, cultivation of the trees yielding these fruits/nuts is constrained by lack of improved planting materials that are true-to-type and have a short enough juvenile phase to fruit production. In addition, information on both above and belowground growth attributes of these species is scarce. This paper presents an overview of the results of a doctoral research focused on two African indigenous fruit tree species, i.e. Dacryodes edulis (G. Don) H. J. Lam (Burseraceae) and Allanblackia floribunda Oliv. (Clusiaceae), which are currently under domestication. For D. edulis, the objective was to assess and compare the structural and fine rooting systems together with the above ground growth attributes of fruiting trees propagated either sexually or vegetatively. The research aim for A. floribunda was to shorten the long juvenile phase before first fruiting through grafting techniques. In summary, the results from the studies on D. edulis suggest that vegetative propagation of the species, reduces the long juvenile phase to fruiting and maintains trueness in the transfer of desirable traits over generations, it also results in trees that are apparently less competitive for below ground resources, have more stable root system, and are bigger in stature and higher in carbon sinks compared to trees of seed origin. In parallel, A. floribunda was shown to be amenable to grafting both under nursery and field (in situ) conditions. Furthermore, a grafted A. floribunda tree transplanted in the field in 2007, flowered and carried a single fruit to maturity after 4 years, thereby reducing the long juvenile period to first fruit production from about 10-12 years reported in literature to less than 5 years. The findings of this doctoral research are therefore pertinent to efforts towards indigenous fruit/nut tree domestication. However, research should be confirmed as it can be considered a pilot study, one that aims to obtain insights into the effect of vegetative propagation methods on above and below ground growth and development of improved planting materials of D. edulis and A. floribunda under domestication.
Effective propagation of Diospyros crassiflora (Hiern) using twig cuttings
Tsobeng Alain * , Tchoundjeu Zacharie, Kouodiekong Lazare, Asaah Ebenezer
International Journal of Biosciences , 2011,
Abstract: The African ebony (Diospyros crassiflora) is a well-sought commercial timber tree. As a result of intense harvesting pressure it ranks high on the IUCN' 1994 CITES list as endangered. Insufficient availability of seeds has limited the current efforts to propagate D. crassiflora from seedlings. Therefore, vegetative propagation through leafy stem cutting could be an alternative. The purpose of this study was to assess the effect of four rooting media, length of cuttings and auxin (seradix-2) application on the rooting ability of stem cuttings set up in a non-mist propagator. The rooting process was monitored over 14 weeks. Root development started after 9 weeks. At 14 weeks, the Seradix-2 and rooting medium significantly improved the rooting ability. Decomposed sawdust was the best substrate. The combination of the three factors didn’t significantly influence rooting of cuttings. Stem cuttings of 5 cm length survive better in non-mist propagator. The results of the study suggest that D. crassiflora is amenable to vegetative propagation by leafy stem cutting.
Antecedents and Effects of Group Sales on Supply Chain Performance: The Case of Kola Production and Marketing in Cameroon
Amos Gyau,Zac Tchoundjeu,Divine Foundjem-Tita,Ebenezer Asaah,Charlie Mbosso,Steven Franzel
Research Journal of Agronomy , 2012, DOI: 10.3923/rjagr.2011.4.9
Abstract: Kola plays an important role in the livelihoods of people in the Northwest region of Cameroon. However, the potential benefits of the product have not been fully exploited due to many problems including ineffective marketing techniques. In an attempt to address this problem, some organisations have facilitated the producers of kola to embark on group sales as a means to improve their marketing performance. During the 1st 5 years of implementation of this programme, there was no clear picture about the impact of the marketing intervention programme on the marketing performance of the farmers. This study discusses the main antecedents and producers perception of the effects of the group sales on the supply chain performance of kola producers in Cameroon. Using open ended interviews with 50 farmers, the study reveals that group sales has the potential to improve kola supply chain performance through increase in prices, quantity harvested and sold and increase in number of producers involved in the group.

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