Suchergebnisse

Die Risikoabschätzung chemischer Pflanzenschutzmittel (PSM) wurde bislang in Agrarsektormodellen auf Basis monetärer Informationen über den Aufwand von Pflanzenschutzmitteln durchgeführt. Ziel der Arbeit ist eine Verbesserung der Abbildungsgüte des Umwelt-Risikopotenzials des Einsatzes chemischer Pflanzenschutzmittel durch eine ökotoxikologische Bewertung des Wirkstoffeinsatzes je Fruchtart auf räumlich differenzierter Ebene der Landkreise in Deutschland. Hierzu werden zwei nationale Modelle (RAUMIS, SYNOPS) und eine bundesweite Erhebung (NEPTUN) zu einem Verbundsystem konsistent zusammengeführt. Vor diesem Hintergrund gliedert sich die Vorgehensweise zur Erstellung des PSM-Indikators in die methodische Entwicklung, die Modellanwendung (ökonomische und ökotoxikologische Wirkungsanalyse eines bundesweiten Uferrandstreifenprogramms) und die Beurteilung der Indikatoreignung für die Umweltberichterstattung und die Politikberatung. ; The risk assessment of chemical pesticides in agricultural sector models has been applied by using the yearly average ofpesticide input costs. To improve the model's quality performance an environmental indicator has been implemented for the first-time into a sector model. Hence the risk indicator is established by estimating crop based active substances towards ecotoxic criteria and comprehending the fruit specific risk potentials up to the regionallevel of the German 'Landkreise'. Therefore two models (RAUMIS, SYNOPS) and a federal survey (NEPTUN) have been combined to a bonded system. In this regard the proceeding is divided into the methodological development. the model application (economic and ecotoxic impact assessment of anational buffer zone program) and the evaluation of the indicator appropriateness for environmental reporting and policy consultancy.

Urban forestry and green spaces have less priority in urban planning. This research intends to assess the policy and planning of urban green spaces with their potential implementation status and challenges in planning and implementation. The general objective is to assess urban green space planning, policy, and implementation strategies and challenges encountered in Addis Ababa. The primary data was collected through key informant interviews, focus group discussions, and field observation; secondary data from a literature review along with examining policy and masterplans of Addis Ababa has been used. The mapping of stakeholder and institutional arrangements is analyzed using stakeholders' consultation. Triangulation is used for data validation and analysis. Existing policy and proclamations must be supported by legislative regulations and implementation frameworks that provide the basis for concrete action plans. The incentives stipulated by the forest policy are not implemented to the required level. The 10th masterplan of the city (2017–2027) shows that the city will increase its green area development and public recreation coverage to 30% by 2020. Principles, such as multi-functionality, connectivity, green-grey interaction, and social inclusiveness, are considered in the planning of the green space development in the 10th masterplan. The research concludes that regulations and directives are not clearly drafted by responsible bodies, and low enforcement is hardly applied with respect to the green space development of Addis Ababa.

Reducing food imports and promoting domestically produced food commodities are long-standing goals for policymakers and other stakeholders in sub-Saharan African countries. For instance, Tanzania, after a long period of dependency on imported food commodities, such as sugar and edible oils, intends to meet its demand for these commodities through domestic production by transforming its agriculture sector to achieve this goal. Applying a general computable equilibrium (CGE) model, this study determines the multiplier effects of technological progress that is assumed to foster domestic edible oilseed crop production, other crops, and Tanzania's economy in general. Findings from the model establish an increase in domestic production not only for the edible oilseed crops but also for other commodities from other sectors of the economy. In addition, there is a decrease in prices on domestically produced commodities sold in the domestic market, and an increase in disposable income is predicted for all rural and urban households, as well as government revenues. Based on model results, we recommend that the Tanzanian government invests in technological progress and interventions that increase production in sectors such as agriculture, where it has a comparative advantage. Interventions that increase smallholder farmer's production, such as the use of improved seed and other modern technologies that reduce costs of production, are critical for reducing food imports and improving food security. ; Peer Reviewed

Poverty is prevalent and widespread in rural Tanzania, where agriculture is the main activity. The government is making significant public investments intended to speed the growth of agriculture as a means to accelerate inclusive economic growth. In line with public investments, the government is promoting public–private partnerships by encouraging the use of improved agricultural innovations and linking farmers to markets, seeking to increase their yields and income. However, there is a paucity of empirical evidence using multipliers analysis about the extent of how gains in agricultural productivity and market linkages for farmers in rural areas help improve the economy at the household level. This paper assesses the welfare effects of the sunflower value chain for a rural economy in Tanzania using a computable general equilibrium (CGE) model for the selected village, which has a high potential for sunflower. Findings highlight the use of the CGE model, first, for analyzing and understanding the economic sectors at a village level. Second, the effects of various upgrading strategies promoted for improving rural farming communities by the government and non-governmental development partners at the micro-scale are analyzed and potential agricultural commodity value chains identified. The multiplier analysis provided insights regarding the potential of sunflower crops for the village economy. ; Peer Reviewed

Cereal crop production in sub-Saharan Africa has not achieved the much-needed increase in yields to foster economic development and food security. Maize yields in the region's semi-arid agroecosystems are constrained by highly variable rainfall, which may be worsened by climate change. Thus, the Tanzanian government has prioritized agriculture as an adaptation sector in its intended nationally determined contribution, and crop management adjustments as a key investment area in its Agricultural Sector Development Programme. In this study, we investigated how future changes in maize yields under different climate scenarios can be countered by regional adjusted crop management and cultivar adaptation strategies. A crop model was used to simulate maize yields in the Singida region of Tanzania for the baseline period 1980-2012 and under three future climate projections for 2020-2060 and 2061-2099. Adaptation strategies to improve yields were full irrigation, deficit irrigation, mulch and nitrogen addition and another cultivar. According to our model results, increase in temperature is the main driver of future maize yield decline. Increased respiration and phenological development were associated with lower maize yields of 16% in 2020-2060 and 20% in 2061-2099 compared to the 1980-2012 baseline. Surprisingly, none of the management strategies significantly improved yields; however, a different maize variety that was tested as an alternative coping strategy performed better. This study suggests that investment in accessibility of improved varieties and investigation of maize traits that have the potential to perform well in a warmer future are better suited for sustaining maize production in the semi-arid region than adjustments in crop management.

Urban forestry and green spaces have less priority in urban planning. This research intends to assess the policy and planning of urban green spaces with their potential implementation status and challenges in planning and implementation. The general objective is to assess urban green space planning, policy, and implementation strategies and challenges encountered in Addis Ababa. The primary data was collected through key informant interviews, focus group discussions, and field observation; secondary data from a literature review along with examining policy and masterplans of Addis Ababa has been used. The mapping of stakeholder and institutional arrangements is analyzed using stakeholders' consultation. Triangulation is used for data validation and analysis. Existing policy and proclamations must be supported by legislative regulations and implementation frameworks that provide the basis for concrete action plans. The incentives stipulated by the forest policy are not implemented to the required level. The 10th masterplan of the city (2017–2027) shows that the city will increase its green area development and public recreation coverage to 30% by 2020. Principles, such as multi-functionality, connectivity, green-grey interaction, and social inclusiveness, are considered in the planning of the green space development in the 10th masterplan. The research concludes that regulations and directives are not clearly drafted by responsible bodies, and low enforcement is hardly applied with respect to the green space development of Addis Ababa. ; Peer Reviewed

This paper discusses micro-level practices for adapting to climate change that are available to small-scale farmers in Africa. The analysis is based on a review of 17 studies about practices that boost small-scale farmers' resilience or reduce their vulnerability to observed or expected changes in climate; it includes data from more than 16 countries in Africa, the Americas, Europe, and Asia. The review shows that African smallholders are already using a wide variety of creative practices to deal with climate risks; these can be further adjusted to the challenge of climate change by planned adaptation programs. We found 104 different practices relevant to climate change adaptation and organized them in five categories: farm management and technology; farm financial management; diversification on and beyond the farm; government interventions in infrastructure, health, and risk reduction; and knowledge management, networks, and governance. We conclude that adaptation policies should complement farmers' autonomous response to climate change through the development of new drought-resistant varieties and improved weather forecasts, the provision of financial services, improvement of rural transportation infrastructure, investments in public healthcare and public welfare programs, and policies that improve local governance and coordinate donor activities. ; Non-PR ; IFPRI1; GRP38 ; EPTD

Cereal crop production in sub-Saharan Africa has not achieved the much-needed increase in yields to foster economic development and food security. Maize yields in the region's semi-arid agroecosystems are constrained by highly variable rainfall, which may be worsened by climate change. Thus, the Tanzanian government has prioritized agriculture as an adaptation sector in its intended nationally determined contribution, and crop management adjustments as a key investment area in its Agricultural Sector Development Programme. In this study, we investigated how future changes in maize yields under different climate scenarios can be countered by regional adjusted crop management and cultivar adaptation strategies. A crop model was used to simulate maize yields in the Singida region of Tanzania for the baseline period 1980–2012 and under three future climate projections for 2020–2060 and 2061–2099. Adaptation strategies to improve yields were full irrigation, deficit irrigation, mulch and nitrogen addition and another cultivar. According to our model results, increase in temperature is the main driver of future maize yield decline. Increased respiration and phenological development were associated with lower maize yields of 16% in 2020–2060 and 20% in 2061–2099 compared to the 1980–2012 baseline. Surprisingly, none of the management strategies significantly improved yields; however, a different maize variety that was tested as an alternative coping strategy performed better. This study suggests that investment in accessibility of improved varieties and investigation of maize traits that have the potential to perform well in a warmer future are better suited for sustaining maize production in the semi-arid region than adjustments in crop management.