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| Registros recuperados: 41 | |
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| BRITO, L. T. de L.. |
| O Brasil é um país privilegiado em água doce. Conta com 12% das reservas do planeta 3 e apresenta uma disponibilidade hídrica per capita variando de 1.835 m /hab./ano, na bacia hidrográfica do Atlântico Leste, a 628.938 m /hab./ano, na bacia Amazônica. A Organização das Nações Unidas (ONU) estabelece um mínimo de 1.700 m /hab./ano. Porém, por causa de suas dimensões geográficas e diversidade climática, algumas regiões, a exemplo do Nordeste, sofrem graves problemas de escassez de água, tanto para consumo humano e animal, como para o desenvolvimento socioeconômico. Apesar desta situação, pouco pode se aproveitar do potencial hídrico de quase 100 mil poços tubulares perfurados, pois, em geral, a água é salobra ou salgada, não sendo apropriada para o consumo,... |
| Tipo: Artigo de divulgação na mídia (INFOTECA-E) |
Palavras-chave: Convivência com o semiárido; Politica de Recursos Hídricos; Semiárido; Chuva; Recurso Hídrico; Disponibilidade de Água; Políticas Públicas; Water conservation; Water distribution; Water policy; Water resources. |
| Ano: 2017 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1099069 |
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| Dahri, Shahzad Hussain; Mangrio, Munir Ahmed; Shaikh, Irfan Ahmed; Dahri, Zakir Hussain; Syed, Ain-ul-Abad; Jakhrani, Jazib Hussain; Syed, Taimoor Ali. |
| This experiment aimed to determine the crop evapotranspiration (ETc), groundwater input in total water used by wheat crop, and to simulate the CROPWAT model to envisage the crop evapotranspiration rate. To estimate on-field ETc and groundwater contribution the combining lysimeter technique was used. The water levels below the soil surface were kept at 1.60, 2.20, and 2.80 m and each water table depth was replicated three times. The experiment was conducted under silt loam (SL) and silty-clay loam (SCL) soil conditions. The climatic parameters and water balance components were recorded accordingly. The on-field ETc was compared with the predicted ETc by CROPWAT model. Under SL soil, the observed ETc was 442, 427, and 401 mm at the water table depth of 1.60,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water conservation; Irrigation amount; Groundwater; And Crop evapotranspiration. |
| Ano: 2021 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6605 |
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| Hanemann, W. Michael; Nauges, Celine. |
| We propose a detailed analysis of heterogeneity in households’ responses to water conservation programs (price increase, voluntary and mandatory conservation) during periods of water shortage. Using a unique dataset covering water consumption of all residential users in Los Angeles (California) during the drought (1988-1992), we show that households generally were responsive to the conservation measures but that the magnitude of households’ responses varies depending on the instrument and on households’ characteristics, in particular the size of their lot. Price elasticity is estimated between –0.29 and –0.47 in the high season (June-October), and between 0 and –0.19 in the low season (November-May). Results suggest that the voluntary conservation program... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Water conservation; Residential use; Heterogeneity in behavior; Panel data; Resource /Energy Economics and Policy; C23; D12; Q25. |
| Ano: 2006 |
URL: http://purl.umn.edu/7158 |
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| Kabore, Daniel; Reij, Chris. |
| This paper describes the emergence of improved traditional planting pits (zaï) in Burkina Faso in the early 1980s as well as their advantages, disadvantages and impact. The zaï emerged in a context of recurrent droughts and frequent harvest failures, which triggered farmers to start improving this local practice. Despair triggered experimentation and innovation by farmers. These processes were supported and complemented by external intervention. Between 1985 and 2000 substantial public investment has taken place in soil and water conservation (SWC). The socio-economic and environmental situation on the northern part of the Central Plateau is still precarious for many farming families, but the predicted environmental collapse has not occurred and in many... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Soil fertility; Soil conservation; Water conservation; Resource /Energy Economics and Policy. |
| Ano: 2004 |
URL: http://purl.umn.edu/16087 |
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| Kendy, Eloise; Molden, David J.; Steenhuis, Tammo S.; Liu, Changming; Wang, Jinxia. |
| The report examines the relationships between agricultural policies in the North China Plain, the approaches to water management that evolved from them, the quantity of water that was actually used, and the consequent groundwater depletion beneath Luancheng County, Hebei Province, from 1949 to 2000. To systematically address these relationships, we use a comprehensive water-balance approach. Our results indicate that a single, longstanding policy-that of using groundwater to meet the crop-water requirements not supplied by precipitation-is responsible for the steady rate of groundwater decline. |
| Tipo: Report |
Palavras-chave: Agricultural production; Groundwater; Aquifers; Water shortage; Irrigation efficiency; Agricultural policy; Crop production; Wastewaters; Water management; Hydrology; Economic development; Crop yield; Cotton; Wheat; Sprinkler irrigation; Water conservation; Water use efficiency; Pumping; Water balance; Vegetables; Rural economy; Irrigated framing; Community/Rural/Urban Development; Crop Production/Industries; Environmental Economics and Policy. |
| Ano: 2003 |
URL: http://purl.umn.edu/44560 |
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| Liao, Yongsong; Gao, Zhanyi; Bao, Ziyun; Huang, Qingwen; Feng, Guangzhi; Xu, Di; Cai, Jiabin; Han, Huijing; Wu, Weifeng. |
| Irrigation occupies a central position in China’s crop production. However, due to low per capita water resources, much worse, unevenly distributed over regions and time and the rapid increase of water diversions to non-irrigation sectors, irrigation water shortages have become a very serious problem. Without the adoption of effective measures this problem may even threaten China’s food security. Currently, irrigation efficiency is very low in general, irrigation water prices cannot fully recover water supply costs, and irrigation facilities are aging due to the lack of funding for O&M (operation & maintenance). Since water prices are regulated by the government, and not determined by the market, water prices did not work effectively in water... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Water rates; Pricing; Price policy; Cost recovery; Farmers attitudes; Water rights; Water market; Water supply; User charges; Irrigation water; Water allocation; Irrigation management; Participatory management; Water conservation; Institutions; Organizations; Water users associations; Cereals; Yields; Models; Labor; Cost benefit analysis; Irrigation requirements; Investment; Groundwater management; Wells; Irrigation canals; Food security; Legal aspects; Crop Production/Industries; Farm Management; Food Security and Poverty; Production Economics; Resource /Energy Economics and Policy. |
| Ano: 2008 |
URL: http://purl.umn.edu/91872 |
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| MELO, R. F. de; ANJOS, J. B. dos. |
| Nas condições da agricultura dependente de chuva, a disponibilidade de água no solo para as culturas varia de acordo com a quantidade e frequência das precipitações, da capacidade do solo em absorver água e da profundidade do sistema radicular. Essa disponibilidade pode ser melhorada com o uso de tecnologias de captação de água de chuva, como também aquelas associadas ao manejo adequado do solo e água, uso de práticas conservacionistas como, incorporação de restos vegetais, cobertura do solo, adubação orgânica, adubação verde, entre outras. Estudos realizados pela Embrapa Semiárido, em parceria com outras instituições, têm ressaltado a importância das tecnologias de captação e armazenamento de água de chuva para melhoria da agricultura familiar no... |
| Tipo: Artigo de divulgação na mídia (INFOTECA-E) |
Palavras-chave: Água de chuva; Agricultura dependente de chuva; Barreamento; Captação de água de chuva; Absorção de Água; Água do Solo; Águas Subterrâneas; Manejo de Água; Barragem Subterrânea; Soil water; Soil water deficit; Water conservation; Water reservoirs. |
| Ano: 2017 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1098685 |
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| Registros recuperados: 41 | |
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