خيارات البحث
النتائج 121 - 130 من 5,572
Climate, Drought, Water, and Food Security النص الكامل
2017
Walsh, Margaret
Water constraints on future food production
2012
Biemans, H.
To meet the food demand of a growing global population, agricultural production will have to more than double in this century. Agricultural land expansion combined with yield increases will therefore be required. This thesis investigates whether enough water resources will be available to sustain the future food production. Using a global scale hydrology and crop growth model, the combined effect of climate change and socio economic changes on water scarcity and food production were quantified. The first thing to explore was where water for agriculture is currently extracted. Reservoirs behind large dams are found to be very important for agriculture and contribute around 18% of the total irrigation water today. It is shown however that with current reservoir capacities and irrigation efficiencies, not enough water can be supplied to sustain an increased food production. Irrigation water shortage can lead to a loss of 20% of the irrigated crop production globally, but with important regional differences. Regions particularly at risk include basins in Southern Africa and South Asia, where production losses on irrigated cropland can become over 50%. This means that unless major investments are made towards improving irrigation efficiency and increasing storage capacity, water shortage will put a serious constraint on future food production.
اظهر المزيد [+] اقل [-]Food security and soil water management النص الكامل
2012 | 2009
Rosegrant, Mark W.; Nkonya, Ephraim M.; Valmonte-Santos, Rowena | http://orcid.org/0000-0002-2069-4551 Valmonte-Santos, Rowena; http://orcid.org/0000-0001-6371-6127 Rosegrant, Mark; http://orcid.org/0000-0001-9348-6561 Nkonya, Ephraim
PR | IFPRI3; Land Resource Management for Poverty Reduction | EPTD
اظهر المزيد [+] اقل [-]Farming for food and water security النص الكامل
2012
Lichtfouse, Eric | Agronomy for Sustainable Development (ASD) ; Institut National de la Recherche Agronomique (INRA) | Agroécologie [Dijon] ; Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement
International audience | Chapters: 1) Public goods and farming. 2) Pesticides and sustainable agriculture. 3) Nitrogen use efficiency by annual and perennial crops. 4) Microalgae for bioremediation of distillery effluent. 5) No-till direct seeding for energy-saving rice production in China. 6) Agricultural water poverty index for a sustainable world. 7) Participatory rural appraisal to solve irrigation issues. 8) Bioavailability of soil P for plant nutrition. 9) Animal manure for smallholder agriculture in South Africa. 10) Vermicompost and soil quality.
اظهر المزيد [+] اقل [-]Growing enough food without enough water النص الكامل
2011
David, S.
Water scarcity is already a reality. More food will be required for a growing and wealthier and urbanized population that will put more pressure on water resources. With several water-related limits reached or breached - groundwater decline, shrinking rivers and threatened fisheries - we must ask, 'Will there be enough water to grow enough food? It is possible to produce the food needed, but if present practices continue it is not probable that we will solve the many poverty and environmental challenges confronting us. To share a scarce resource and to limit environmental damage in the face of climate change, it is imperative to limit future water use. Important pathways to growing enough food with limited water are to increase productivity of water in irrigated and rainfed areas, improve water management in low-yielding rainfed areas, and to consider our own food consumption patterns. In pockets of poverty in Sub-Saharan Africa and Asia, expanding access to water through a range of water management solutions holds the key to food security and poverty reduction. For sustainable water use, water managers must consider agriculture as an ecosystem and how other ecosystem services are impacted through water. These actions will require serious changes in how we think about water and food, and how we govern water and land resources.
اظهر المزيد [+] اقل [-]Growing enough food without enough water. النص الكامل
2011
Molden, D.
Water scarcity is already a reality. More food will be required for a growing and wealthier and urbanized population that will put more pressure on water resources. With several water-related limits reached or breached - groundwater decline, shrinking rivers and threatened fisheries - we must ask, Will there be enough water to grow enough food? It is possible to produce the food needed, but if present practices continue it is not probable that we will solve the many poverty and environmental challenges confronting us. To share a scarce resource and to limit environmental damage in the face of climate change, it is imperative to limit future water use. Important pathways to growing enough food with limited water are to increase productivity of water in irrigated and rainfed areas, improve water management in low-yielding rainfed areas, and to consider our own food consumption patterns. In pockets of poverty in sub-Saharan Africa and Asia, expanding access to water through a range of water management solutions holds the key to food security and poverty reduction. For sustainable water use, water managers must consider agriculture as an ecosystem and how other ecosystem services are impacted through water. These actions will require serious changes in how we think about water and food, and how we govern water and land resources.
اظهر المزيد [+] اقل [-]Climate change, water and food security النص الكامل
2011
Turral, Hugh | Burke, Jacob J. | Faurès, Jean-Marc
"The impacts of climate change on the global hydrological cycle are expected to vary the patterns of demand and supply of water for agriculture -- the dominant user of freshwater. The extent and productivity of both irrigated and rainfed agriculture can be expected to change. As a result, the livelihoods of rural communities and the food security of a predominantly urban population are at risk from water-related impacts linked primarily to climate variability. The rural poor, who are the most vulnerable, are likely to be disproportionately affected. Adaptation measures that build upon improved land and water management practices will be fundamental in boosting overall resilience to climate change. And this is not just to maintain food security: the continued integrity of land and water systems is essential for all economic uses of water. This report summarizes current knowledge of the anticipated impacts of climate change on water availability for agriculture and examines the implications for local and national food security. It analyses expected impact of climate change on a set of major agricultural systems at risk and makes the case for immediate implementation of 'no-regrets' strategies which have both positive development outcomes and make agricultural systems resilient. It is hoped that policy makers and planners can use this report to frame their adaptation responses when considering both the water variable in agriculture and the competing demands from other users"--Page 4 of cover.
اظهر المزيد [+] اقل [-]Irrigation water quality and food safety
2010
Hogg, Terry John
Water prices, environment, and food security
2003
Rosegrant, Mark W. | Xueliang Cai
Water, irrigation and the food crisis
1998
Christofidis, D. (Secretaria de Recursos Hidricos, IICA, SQS 309 Bloco B, Apt. 501, CEP 70362-020, Brasilia DF (Brazil))
