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Displaying 11 - 20 of 222 results.

Seed market liberalization, hybrid maize adoption, and impacts on smallholder farmers in Tanzania

Since the early 1990s, liberalization of the seed market in Tanzania has attracted several foreign companies that now market maize hybrids in the country. In this article, we analyze the impacts of proprietary hybrids on maize yields, production, and household living standards. We build on a recent survey of smallholder maize farmers in two zones of Tanzania. Hybrid adoption rates are 48% and 13% in the North and East, respectively. Average net yield gains of hybrids are 50-60%, and there are also significant profit effects.

Sujet(s): 
évaluation de l'impactsystèmes d'innovationdéveloppement ruralagriculture durable
Année de publication: 
2012
Auteur: 
Kathage J.Qaim M.Kassie M.Shiferaw B. A.
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Farmer participation in supermarket channels and technical efficiency: The case of vegetable production in Kenya

Supermarkets and high-value exports are currently gaining ground in the agri-food systems of many developing countries. While recent research has analyzed income effects in the small farm sector, impacts on farming efficiency have hardly been studied. Using a survey of Kenyan vegetable growers and a stochastic frontier approach, we show that participation in supermarket channels increases mean technical efficiency by 19%. This gain is bigger at lower levels of efficiency, suggesting the potential for positive income distribution effects.

Sujet(s): 
évaluation de l'impactsystèmes d'innovationapproches participativesdéveloppement ruralagriculture durable...
Année de publication: 
2009
Auteur: 
Rao E. J. O.Qaim M.
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Information Asymmetries and Technology Adoption: The Case of Tissue Culture Bananas in Kenya

Classical innovation adoption models implicitly assume homogenous information flow across farmers, which is often not realistic. As a result, selection bias in adoption parameters may occur. We focus on tissue culture (TC) banana technology that was introduced in Kenya more than 10 years ago. Up till now, adoption rates have remained relatively low.

Sujet(s): 
renforcement des capacités (RC)éducationvulgarisationsystèmes d'innovationsystèmes de connaissances et d'information...
Année de publication: 
2011
Auteur: 
Kabunga N. S.Dubois T.Qaim M.
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Impact of tissue culture banana technology in Kenya: A difference-in-difference estimation approach

Most micro-level studies on the impact of agricultural technologies build on cross-section data, which can lead to unreliable impact estimates. Here, we use panel data covering two time periods to estimate the impact of tissue culture (TC) banana technology in the Kenyan small farm sector. TC banana is an interesting case, because previous impact studies showed mixed results. We combine propensity score matching with a difference-in-difference estimator to control for selection bias and account for temporal impact variability.

Sujet(s): 
renforcement des capacités (RC)vulgarisationévaluation de l'impactagriculture durable
Année de publication: 
2012
Auteur: 
Kikulwe E. M.Kabunga N. S.Qaim M.
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Heterogeneous effects of marketing contracts and resource-providing contracts on household income

In the existing literature, the effects of contract farming on household welfare were examined with mixed results. Most studies looked at single contract types. This paper contributes to the literature by comparing two types of contracts – simple marketing contracts and resource- providing contracts – in the Ghanaian oil palm sector. We investigate the effects of both contracts on farm income, as well as spillovers on other household income sources. We use survey data collected with an innovative sampling design and a control function approach to address possible issues of endogeneity.

Sujet(s): 
renforcement des capacités (RC)systèmes d'exploitation agricoleévaluation de l'impactsystèmes d'innovationpolitiquesdéveloppement rural...
Année de publication: 
2020
Auteur: 
Ruml A.Ragasa C.Qaim M.
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Social networks and farmer exposure to improved crop varieties in Tanzania

In Sub-Sahara Africa, adoption rates of improved crop varieties remain relatively low, which is partly due to farmers’ limited access to information. In smallholder settings, information often spreads through informal networks. Better understanding of such networks could potentially help to spur innovation and farmers’ exposure to new technologies. This study uses survey data from Tanzania to analyze social networks and their role for the spread of information about improved varieties of maize and sorghum.

Sujet(s): 
renforcement des capacités (RC)Égalité entre les sexessystèmes d'innovationréseaurecherchedéveloppement rural...
Année de publication: 
2014
Auteur: 
Muange E. N.Schwarze S.Qaim M.
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Labor savings in agriculture and inequality at different spatial scales

Labor saving innovations are essential to increase agricultural productivity, but they might also increase inequality through displacing labor. Empirical evidence on such labor displacements is limited. This study uses representative data at local and national scales to analyze labor market effects of the expansion of oil palm among smallholder farmers in Indonesia. Oil palm is labor-saving in the sense that it requires much less labor per unit of land than alternative crops.

Sujet(s): 
renforcement des capacités (RC)communicationÉgalité entre les sexesévaluation de l'impactsystèmes d'innovationdéveloppement rural...
Année de publication: 
2019
Auteur: 
Kubitza C.Dib J. B.Kopp T.Krishna V. V.Nuryartono N.Qaim M.Romero M.Klasen S.
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Are the economic benefits of Bt cotton sustainable? Evidence from Indian panel data

While several studies have shown that genetically modified Bt cotton can benefit smallholder farmers economically, the sustainability of these effects is still unclear and debated controversially between biotechnology proponents and critics. We use unique panel data of 533 cotton farmers, collected in India between 2002 and 2008, to analyze Bt impacts on cotton yield, profit, and household living standards. Results from fixed effects models show that the adoption of Bt cotton is associated with a net yield gain of 24% and a profit increase of 50%.

Sujet(s): 
renforcement des capacités (RC)évaluation de l'impactsystèmes d'innovationdéveloppement rural
Année de publication: 
2011
Auteur: 
Kathage J.Qaim M.
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Nutrition effects of the supermarket revolution on urban consumers and smallholder farmers in Kenya

Food systems in developing countries are transforming, involving a rapid expansion of supermarkets. This supermarket revolution may affect dietary patterns and nutrition, but empirical evidence is scarce. The few existing studies have analyzed implications for food consumers and producers separately. We discuss a more integrated framework that helps to gain a broader understanding. Reviewing recent evidence from Kenya, we show that buying food in supermarkets instead of traditional outlets contributes to overnutrition among adults, while reducing undernutrition among children.

Sujet(s): 
sécurité alimentaire et nutritionnelleévaluation de l'impactprocessus multipartiteschaînes de valeur
Année de publication: 
2014
Auteur: 
Qaim M.Andersson C. I. M.Chege C. G. K.Kimenju S. C.Klasen S.Rischke R.
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The Role of Extension and Sustainable Soil Management in Smallholder Agriculture-Evidence from Ethiopia

Rising demand for agricultural commodities coupled with population growth, climate change, declining soil fertility, environmental degradation and rural poverty in the developing world call for strategies to sustainably intensify agricultural production. Sustainable intensification refers to increasing production from the same area of land while reducing its negative environmental consequences.

Sujet(s): 
vulgarisationévaluation de l'impactsystèmes d'innovationdéveloppement ruralagriculture durable...
Année de publication: 
2020
Auteur: 
Hoerner D.
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