Pruning waste management and climate change in Sierra Mágina's olive groves (Andalusia, Spain)

Unidad de excelencia María de Maeztu MdM-2015-0552In the context of climate change, concern is raising about the negative effects of some pruning waste management practices. On the one hand, burning of pruning residue is seen as controversial regarding its contribution to greenhouse gas emissions. On the other hand, chipping the wood and using it as mulch is seen as highly risky regarding pest and disease control. Considering these issues, it is important to try to understand how and why these practices are adopted. In this study, we conducted in-depth interviews and survey questionnaires in the olive-growing region of Sierra Mágina (Andalusia) in order to explore (1) which were the pruning waste management practices in place, (2) which had been these practices in the past, and (3) which were the factors influencing the choice of different practices. Since 2010, there has been a shift in pruning waste management practices in this region, from stubble burning to chipping. This change seems to be led by older/retired farmers that have young and non-inherited groves. Moreover, this change is shown not to be necessarily a result of "greening" in agriculture but rather a result of intensification and mechanization. These results are discussed regarding the processes of innovation adoption in the region and the possible unforeseen externalities that derive from this change in pruning waste management practices

Pruning waste management and climate change in Sierra Mágina's olive groves (Andalusia, Spain)

Unidad de excelencia María de Maeztu MdM-2015-0552In the context of climate change, concern is raising about the negative effects of some pruning waste management practices. On the one hand, burning of pruning residue is seen as controversial regarding its contribution to greenhouse gas emissions. On the other hand, chipping the wood and using it as mulch is seen as highly risky regarding pest and disease control. Considering these issues, it is important to try to understand how and why these practices are adopted. In this study, we conducted in-depth interviews and survey questionnaires in the olive-growing region of Sierra Mágina (Andalusia) in order to explore (1) which were the pruning waste management practices in place, (2) which had been these practices in the past, and (3) which were the factors influencing the choice of different practices. Since 2010, there has been a shift in pruning waste management practices in this region, from stubble burning to chipping. This change seems to be led by older/retired farmers that have young and non-inherited groves. Moreover, this change is shown not to be necessarily a result of "greening" in agriculture but rather a result of intensification and mechanization. These results are discussed regarding the processes of innovation adoption in the region and the possible unforeseen externalities that derive from this change in pruning waste management practices

Biomolecules from olive pruning waste in Sierra Mágina - Engaging the energy transition by multi-actor and multidisciplinary analyses

Unidad de excelencia María de Maeztu MdM-2015-0552The price volatility of fossil resources, the uncertainty of their long-term availability and the environmental, climatic and societal problems posed by their operation lead to the need of an energy transition enabling the development and utilization of other alternative and sustainable resources. Acknowledging that indirect land-use change can increase greenhouse gas emission, the European Union (EU) has reshaped its biofuel policy. It has set criteria for sustainability to ensure that the use of biofuels guarantees real carbon savings and protects biodiversity. From a sustainability perspective, biofuels and bioliquids offer indeed both advantages (e.g., more secure energy supply, emission reductions, reduced air pollution and production of high added-value molecules) as well as risks (monocultures, reduced biodiversity and even higher emissions through land use change). Approaching economic, environmental and social sustainability at the local level and in an integrated way should help to maximize benefits and minimize risks. This approach has been adopted and is described in the present work that combines chemical, biological, social and territorial studies on the management of pruning waste residues from olive trees in the Sierra Mágina in Spain. The biological and social analyses helped to orientate the research towards an attractive chemical process based on extraction and pyrolysis, in which high added value molecules are recovered and in which the residual biochar may be used as pathogen-free fertilizer. In this region where farmers face declining economic margins, the new intended method may both solve greenhouse gas emission problems and provide farmers with additional revenues and convenient fertilizers. Further research with a larger partnership will consolidate the results and tackle issues such as the logistics

Pruning waste management and climate change in Sierra Mágina's olive groves (Andalusia, Spain)

Unidad de excelencia María de Maeztu MdM-2015-0552In the context of climate change, concern is raising about the negative effects of some pruning waste management practices. On the one hand, burning of pruning residue is seen as controversial regarding its contribution to greenhouse gas emissions. On the other hand, chipping the wood and using it as mulch is seen as highly risky regarding pest and disease control. Considering these issues, it is important to try to understand how and why these practices are adopted. In this study, we conducted in-depth interviews and survey questionnaires in the olive-growing region of Sierra Mágina (Andalusia) in order to explore (1) which were the pruning waste management practices in place, (2) which had been these practices in the past, and (3) which were the factors influencing the choice of different practices. Since 2010, there has been a shift in pruning waste management practices in this region, from stubble burning to chipping. This change seems to be led by older/retired farmers that have young and non-inherited groves. Moreover, this change is shown not to be necessarily a result of "greening" in agriculture but rather a result of intensification and mechanization. These results are discussed regarding the processes of innovation adoption in the region and the possible unforeseen externalities that derive from this change in pruning waste management practices