Всего публикаций в данном разделе: 19
STRATEGIES TO INCREASE AGRICULTURAL PRODUCTIVITY AND REDUCE LAND DEGRADATION: EVIDENCE FROM UGANDA / доклад на 25 конференции IAAE, Reshaping Agriculture’s Contribution to Society, International Convention Centre, Durban, South Africa, 16-23 August 2003 [книги]
Опубликовано на портале: 12-12-2003John Pender, Ephraim Nkonya, Pamela Jagger, Dick Sserunkuuma, Henry Ssali
This paper estimates a structural econometric model of household decisions regarding income strategies, participation in programs and organizations, crop choices, land management, and labor use, and their implications for agricultural production and land degradation; based upon a survey of over 450 households and their farm plots in Uganda. The results generally support the Boserupian model of population-induced agricultural intensification, but do not support the .more people-less erosion. hypothesis, with population pressure found to contribute to erosion in the densely populated highlands. Agricultural technical assistance programs have location-specific impacts on agricultural production and land degradation, contributing to higher value of crop production in the lowlands, but to soil erosion in the highlands. By contrast, NGO programs focusing on agriculture and environment are helping to reduce erosion, but have mixed impacts on production. We find little evidence of impact of access to markets, roads and credit, land tenure or title on agricultural intensification and crop production, though road access appears to contribute to land degradation in the highlands. Education increases household incomes, but also reduces crop production in the lowlands. We do not find evidence of a poverty-land degradation trap, while poverty has mixed impacts on agricultural production: smaller farms obtain higher crop production per hectare, while households with fewer livestock have crop production. These findings suggest that development of factor markets can improve agricultural efficiency. Several other factors that contribute to increased value of crop production, without significant impacts on land degradation, include specialized crop production, livestock and nonfarm income strategies, and irrigation. In general, the results imply that the strategies to increase agricultural production and reduce land degradation must be location-specific, and that there are few .win-win. opportunities to simultaneously increase production and reduce land degradation.
Food Safety Information and Food Demand – Effects of Temporary and Permanent News /доклад на 10 конгрессе ЕААЕ, Exploring Diversity in the European Agri-Food System, Zaragoza, Spain, 28-31 August 2002 [книги]
Опубликовано на портале: 29-11-2003Sinne Smed, Jorgen Dejgaard Jensen
This paper examines the cross-impacts of food safety news concerning one product on the demand for another product, using the Danish demand for pasteurized eggs versus shell eggs as an illustrative case. The study identifies news with a temporary impact and news with a permanent impact on consumers’ food demand behavior. The techniques used to identify the permanent versus temporary news are recursive estimation and parameter stability. Whereas “permanent” news is identified to be represented by a specific individual event, “temporary” news concerning salmonella in eggs is aggregated into a news-index variable. Both temporary and permanent news concerning salmonella in shell eggs appear to have significant positive impacts on the demand for pasteurized eggs. The model is estimated as an Error Correction Model. Consumers are found to adjust quite rapidly to both temporary and permanent news. Both the composition of egg consumption accounted as mean budget shares varies across socio-demographic household groups as well as the impact of the considered permanent news.
Systems Analysis by Graph-theoretic Techniques: Assessment of Institutional Linkages in the Agricultural Innovation System of Azerbaijan /доклад на 10 конгрессе ЕААЕ, Exploring Diversity in the European Agri-Food System, Zaragoza, Spain, 28-31 August 2002 [книги]
Опубликовано на портале: 04-01-2004Tugrul Temel, Willem Janssen, Fuad Karimov
This paper develops a quantitative, graph-theoretic method for analysing systems of institutions. With an application to the agricultural innovation system of Azerbaijan, the method is illustrated in detail. An assessment of existing institutional linkages in the system suggests that efforts should be placed on the development of intermediary institutions to facilitate quick and effective flow of knowledge between the public and the private components of the system. Furthermore, significant accomplishments are yet to come in policy-making, research and education, and credit institutions.
Measuring the impacts of working-age adult mortality on small-scale farm households in Kenya / доклад на 25 конференции IAAE, Reshaping Agriculture’s Contribution to Society, International Convention Centre, Durban, South Africa, 16-23 August 2003 [книги]
Опубликовано на портале: 31-12-2003Takashi Yamano, T. S. Jayne
Using a two-year panel of 1,422 Kenyan households surveyed in 1997 and 2000, we measure how working age adult mortality affects rural households’ size and composition, crop production, asset levels, and off-farm income. First, the paper uses adult mortality rates from available data on an HIV-negative sample to predict the proportion of deaths observed between 1997 and 2000 due to AIDS. Next, using a difference-indifferences estimation, we measure changes in outcomes between households afflicted by adult mortality vs. those not afflicted over the three-year survey period. The effects of adult mortality are highly sensitive to the gender and position of the deceased family member in the household. Households suffering the death of the head-of-household or spouse incurred a greater-than-one person loss in household size. The death of a male head-of-household between 16 and 59 years is associated with a 68% reduction in the net value of the household’s crop production. Female head-of-household or spouse mortality causes a greater decline in cereal area cultivated, while cash crops such as coffee, tea, and sugar are most adversely affected in households incurring the death of a male head-of-household. Off-farm income is also significantly affected by the death of the male head-of-household, but not in the case of other adult members. The death of other working-age family members is partially offset by an inflow of other individuals into the family and has less dramatic effects on the households’ agricultural production, assets, and off-farm income. The effects of adult mortality are also sensitive to the household’s initial asset levels. Lastly, there is little indication that households are able to recover quickly from the effects of working-age head-of-household adult mortality; the effects on crop and non-farm incomes do not decay at least over the three-year survey interval.