Suchergebnisse

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.

Brazilian legislative proposal n. 6,299/2002, addressing pesticide regulation, represents an attempt to loosen and weaken the regulation of these substances, threatening the rights to food and a healthy environment as enshrined in the Constitution of the Federative Republic of Brazil. This article reviews the bill and its more troublesome provisions through the lenses of food security and nutrition as well as national environmental law principles and provisions. Within this background, the paper concludes that Bill n. 6,299/2002 works against previously achieved progress in providing alternative policy pathways for sustainable agriculture in Brazil. It clashes with environmental law principles, neglecting precaution and prevention, representing a regression in terms of protection levels, while undermining human rights to food and a healthy environment. The methodology includes a literature and documentary review, along with inductive reasoning.

Sustainable water usage is an important global concern and an urgent priority, especially in dryland regions such as Iran. The Iranian government is actively addressing the challenge of water scarcity by encouraging farmers to adopt new water application technology. Its main element to decrease water consumption is to encourage new irrigation systems, in particular drip irrigation. However, despite the benefits of drip irrigation technologies and the availability of generous government subsidies, adoption rates of the improved irrigation technology remain critically low among Iranian farmers. Therefore, this study seeks to determine what is limiting the uptake of improved irrigation technology in Iran. While it is well known that acceptance of new technology ultimately depends on multiple and interrelated factors, we examine those factors affecting farmers' adoption from three theoretical perspectives in the adoption literature: farmers' socio-economic characteristics, social capital, and technology characteristics. A cross-sectional survey was undertaken in Behbahan district in Khuzestan province in southwest Iran. The sample comprises 174 farmers who adopted drip irrigation in that region and 100 non-adopters who were located in the same region. Discriminant analysis reveals that a socio-economic approach is the strongest model to predict adoption of drip irrigation technology in the study area, followed by models of technical characteristics, and social capital. These results can help agricultural extension agents and policy-makers design appropriate and effective strategies that facilitate the adoption of drip irrigation at an increasing rate. ; Peer Reviewed

Weak governance is a major threat to sustainable development, especially in rural contexts and within ecosystems of great social and economic value. To understand and compare its arrangement in the grasslands and wetlands of the Colombian Llanos and the Paraguayan Pantanal, we build upon the Institutional and Development Framework (IAD) as we explore the role of political, economic, and social institutions and combine components of the theory of common-pool resources (CPR) and new institutional economics (NIE). This hybrid conceptualization provides a synthesis of how top-down hierarchical and market-based systems of community-based and natural resource management negatively affect sustainable development in both study areas. Our findings suggest three underlying mechanisms causing a situation of weak governance: centralized (economic and political) power, the role of central and local governments, and social exclusion. Understanding these multidimensional contextual mechanisms improves the understanding that institutional structures supporting arrangements that handle grasslands and wetlands in a sustainable way are needed to protect the ecosystem's social and economic values, especially in rural and marginalized contexts. ; Peer Reviewed

Weak governance is a major threat to sustainable development, especially in rural contexts and within ecosystems of great social and economic value. To understand and compare its arrangement in the grasslands and wetlands of the Colombian Llanos and the Paraguayan Pantanal, we build upon the Institutional and Development Framework (IAD) as we explore the role of political, economic, and social institutions and combine components of the theory of common-pool resources (CPR) and new institutional economics (NIE). This hybrid conceptualization provides a synthesis of how top-down hierarchical and market-based systems of community-based and natural resource management negatively affect sustainable development in both study areas. Our findings suggest three underlying mechanisms causing a situation of weak governance: centralized (economic and political) power, the role of central and local governments, and social exclusion. Understanding these multidimensional contextual mechanisms improves the understanding that institutional structures supporting arrangements that handle grasslands and wetlands in a sustainable way are needed to protect the ecosystem's social and economic values, especially in rural and marginalized contexts.

A major challenge in the field of environmental peacebuilding is showing the impact of its initiatives. Questions emerge, such as what kind of postwar peacebuilding dimensions are more likely to be affected by natural resource management projects? Although quantitative studies assess the relation between natural resource management programmes and conflict, the question remains: what are the mechanisms involved in implementing projects designed for environmental peacebuilding? To answer these questions, a mixed methods research approach is chosen, combining four qualitative and quantitative methods to triangulate results. First, we identify a set of peacebuilding dimensions and mechanisms based in the literature that facilitate assessing the impact of sustainable land-use systems (SLUS) design in the post-peace agreement region of Caquetá, Colombia. Second, not only do we interview experts and practitioners at global, national (Colombia) and local (Department of Caquetá) levels in the fields of peacebuilding, natural resource management and environmental peacebuilding, we also conduct three workshops and a survey in Caquetá to prioritize dimensions and discover explanatory mechanisms. The case of Caquetá, Colombia, shows that peacebuilding dimensions, such as socio-economic inclusion (e.g. sustainable livelihoods), creation of governance scenarios, and building capacities for dialogue and a peace culture, should be addressed to take account of the impacts of SLUS projects in post-conflict peacebuilding.