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| Mgonja, Mary A.; Okello, Julius Juma; Mwangi, Stephen G.; Manyasa, Eric; Ouma, James Okuro; Godiah, Lawrence; Alumira, Jane; Kibuka, J.. |
| This paper uses a random sample of 881 farmers drawn from eastern and western Kenya to examine the prevalence and drivers of seed and pollen mediated geneflow in the two major sorghum growing regions. It employs both qualitative and quantitative techniques to assess farmers’ awareness of wild sorghum varieties, the practices they use in maintaining varietal purity and the conditioners of their success in maintaining the purity of cultivated varieties. The study finds that, among others, cultural differences, agro-climate and poverty affect the awareness, practices used in maintaining varietal purity and farmers’ success in doing so. These findings have implication for biosafety and policy in Kenya due to the clamour to introduce genetically modified... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Cultivated sorghum; Prevalence of wild sorghum varieties; Geneflow; Varietal purity; Biosafety; Kenya; Crop Production/Industries; Food Security and Poverty; Production Economics. |
| Ano: 2009 |
URL: http://purl.umn.edu/51901 |
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| Ouma, James Okuro; De Groote, Hugo; Owuor, George. |
| Maize is a key food crop in Kenya. While maize yields increased from 1.25 t ha-1 in early 1960s to over 2 tonnes in 1982, they fell below 1.5 t ha-1 in 2000. Given the limited land area, there is no doubt that Kenya will have to rely more on modern technologies for increased yields .Use of improved maize varieties and fertilizers will therefore continue to be critical inputs for improving productivity. To improve production, it is important to understand factors determining adoption and intensity of use of modern technologies. A stratified 2-stage sampling design was used to select 1800 households, subsequently interviewed by means of structured questionnaire. Econometric models were used to explore factors influencing adoption and intensity of use of the... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Maize; Adoption; Improved seed; Fertilizer; Credit; Extension; Kenya; Crop Production/Industries. |
| Ano: 2006 |
URL: http://purl.umn.edu/25433 |
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| De Groote, Hugo; Owuor, George; Doss, Cheryl R.; Ouma, James Okuro; Muhammad, Lutta; Danda, Milton Kengo. |
| The maize green revolution, which increased maize yields through the use of improved varieties and fertilizer, has stalled since the mid-eighties in Kenya. This paper examines whether the stagnation of yields continued in the 1990s in spite of the implementation of the maize liberalization policies by the Kenya Government. Analysis of farm level surveys from 1992 and 2002 indicates slight increases in the use of improved maize varieties and fertilizer, but a substantial decrease in the intensity of fertilizer use. The econometric analysis suggests that the intensity of fertilizer use has a major effect on yield. The use of improved maize varieties, however, did not affect yield, suggesting that there are local varieties for some areas that do as well as... |
| Tipo: Journal Article |
Palavras-chave: Green revolution; Maize; Adoption; Soil fertility; Kenya; Crop Production/Industries; International Development. |
| Ano: 2005 |
URL: http://purl.umn.edu/110143 |
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| De Groote, Hugo; Overholt, William; Ouma, James Okuro; Mugo, Stephen. |
| The Insect Resistant Maize for Africa (IRMA) project is currently developing Bt maize for Kenya. So far, Bt genes with resistance to Chilo partellus, Chilo orichalcociliellus, Eldana Sacharina, and Sesamia calamistis, four of the five major stemborers were successfully incorporated into elite CIMMYT maize inbred line (CML216) and tested in insect bioassays in Kenya. Participatory Rural Appraisals showed that stem borers are indeed a major pest problems for farmers. Four seasons of on-farm crop loss assessment showed an average crop loss of 13.5%, or 0.4 million tons, valued at US$ 80 million. If the project manages to find a Bt gene that is effective to the fifth stemborer, Busseola fusca, adoption rates are likely to be high, and therefore the returns.... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Maize; Africa; Genetically Modified Crops; Bt crops; Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies. |
| Ano: 2003 |
URL: http://purl.umn.edu/25854 |
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| Wanyama, Joseph M.; De Groote, Hugo; Mose, Lawrence Obae; Odendo, Martins; Ouma, James Okuro; Owuor, George; Lutta, M.; Ndung'U, J.; Mutoko, M.C.. |
| Maize is the staple food crop and source of income for majority of the Kenyan population and many sub-Saharan African countries. The increasing Kenyan population demands an increase in maize production if intermittent food deficits have to be averted. Since the introduction of improved maize varieties in mid-1960, the start of Green Revolution period, maize yields increased drastically up to 1970s and started declining from 1980s to-date. The key contributory factors are nutrient mining, sub-optimal input use and insect pest damage. Of the insect pests, stalk borer is of economic importance. Currently, KARI and CIMMYT are developing maize varieties that are tolerant to stalk borer damage. In order to evaluate the potential impact of these interventions... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Crop Production/Industries. |
| Ano: 2004 |
URL: http://purl.umn.edu/9526 |
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| Ouma, James Okuro; Bett, Charles; Githaigah, T.. |
| Lack of access to nutritious food is an underlying and major cause of child mortality in Africa. Improving the nutritional quality of food crops, through biofortification, would be a useful complementary strategy to other agricultural and public health interventions. Quality Protein Maize (QPM) varieties have been developed through biofortification. Consumption of these varieties leads to greater protein utilisation in adults and children. In Kenya three QPM varieties have been released. In Central Kenya, particularly Kirinyaga district, farmers have come together through Innovation Platform for Technology Adoption ( IPTA) with the aim of production, value addition and marketing of QPM based products. These groups require information on the potential... |
| Tipo: Journal Article |
Palavras-chave: Market; Products; Quality Protein Maize; Rapid market appraisal; Crop Production/Industries; Marketing. |
| Ano: 2010 |
URL: http://purl.umn.edu/96173 |
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| Ouma, James Okuro; Odendo, Martins; Bett, Charles; De Groote, Hugo; Mugo, Stephen; Mutinda, Charles; Gethi, James; Njoka, Stephen; Ajanga, S.; Shuma, J.. |
| Insect Resistant Maize for Africa Project (IRMA) aims at developing and deploying insect resistant maize varieties to reduce grain losses due to insect pests. As part of incorporating farmer’s perceptions and improving the adoption of the developed varieties, participatory approaches are adopted. The paper analysis farmer’s preferences of maize germplasm developed through conventional breeding. The paper uses data collected from evaluations conducted at the end of 2006 April and October rains. Nine stem borer resistant maize varieties were evaluated alongside six commercial checks in the moist transitional zones (East and West) at vegetative and harvest stage, while in the dry transitional zone and dry mid altitude zones, 6 new varieties were evaluated... |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries. |
| Ano: 2010 |
URL: http://purl.umn.edu/96189 |
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