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País United States (17) Brazil (3) Idioma Inglês (20)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 20 Primeira ... 1 ... Última Agricultural water management in a water stressed catchment: lessons from the RIPARWIN project AgEcon McCartney, Matthew P.; Lankford, Bruce A.; Mahoo, Henry F.. With contributions from Julien Cour, Reuben Kadigi, Japhet Kashaigili, Magayane Machibya, Abraham Mehari, Sylvie Morardet, Kossa Rajabu, Charles Sokile, Siza Tumbo, Barbara van Koppen, Thalia Vounaki and Daniel Yawson Tipo: Report Palavras-chave: River basin management; Water stress; Irrigation programs; Irrigation management; Irrigation efficiency; Water use; Water allocation; Wetlands; Water rights; Water law; Economic aspects; Water rates; User charges; Water users associations; Decision support tools; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Productivity Analysis; Resource /Energy Economics and Policy. Ano: 2007 URL: http://purl.umn.edu/37668 Comparison of Water Allocation Strategies for Wheat Production in the Texas Panhandle AgEcon Colette, W. Arden; Almas, Lal K.. The declining availability of irrigation water from the Ogallala aquifer combined with increasing energy costs make irrigation strategies much more critical. Irrigation strategies that maximize returns to irrigation require less water and achieve higher returns than strategies aimed at satisfying 100% of the crops evapotranspiration (ET) requirements. Tipo: Conference Paper or Presentation Palavras-chave: Irrigation efficiency; Water response function; Input use optimization; ET; Crop Production/Industries; Resource /Energy Economics and Policy. Ano: 2007 URL: http://purl.umn.edu/34995 Does Efficient Irrigation Technology Lead to Reduced Groundwater Extraction?: Empirical Evidence AgEcon Pfeiffer, Lisa; Lin, C.-Y. Cynthia. Please see the revised, peer reviewed paper: Lisa Pfeiffer, C.-Y. Cynthia Lin, Does efficient irrigation technology lead to reduced groundwater extraction? Empirical evidence, Journal of Environmental Economics and Management, Available online 23 December 2013, ISSN 0095-0696, http://dx.doi.org/10.1016/j.jeem.2013.12.002. (http://www.sciencedirect.com/science/article/pii/S0095069613001095) Tipo: Conference Paper or Presentation Palavras-chave: Irrigation efficiency; Groundwater management; Irrigation technology; Environmental Economics and Policy; Land Economics/Use. Ano: 2010 URL: http://purl.umn.edu/60927 DOES EFFICIENT WATER MANAGEMENT MATTER? PHYSICAL AND ECONOMIC EFFICIENCY OF WATER USE IN THE RIVER BASIN AgEcon Cai, Ximing; Ringler, Claudia; Rosegrant, Mark W.. With growing water scarcity and increasing competition across water-using sectors, the need for water savings and more efficient water use has increased in importance in water resources management. Improvement in the physical efficiency of water use is related to water conservation through increasing the fraction of water beneficially used over water applied, while enhancing economic efficiency is a broader concept seeking the highest economic value of water use through both physical and managerial measures. Physical and economic efficiency measures are both useful indicators for water management at the irrigation system and river basin level. However, the relationship between physical efficiency and economic efficiency is not always clear and the values... Tipo: Working or Discussion Paper Palavras-chave: Basin water management; Water use efficiency; Irrigation efficiency; Economic efficiency; Resource /Energy Economics and Policy. Ano: 2001 URL: http://purl.umn.edu/16043 Governance for Integrated Water Resources Management in a River-Basin Context: Proceedings of a Regional Seminar, Bangkok, May 2002 AgEcon Tipo: Presentation Palavras-chave: Water resource management; River basins; Governance; Institutional development; Groundwater irrigation; Water policy; Water allocation; Water demand; Irrigation efficiency; Models; Case studies; Institutional and Behavioral Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy. Ano: 2003 URL: http://purl.umn.edu/118402 Integrated water resource systems: Theory and policy implications AgEcon Keller, Andrew; Keller, Jack; Seckler, David. Presents the concept of integrated water resources systems (IWS) as clearly and simply as possible, with a focus on the irrigation sector-the largest and most complex user of water. Tipo: Report Palavras-chave: Water resource management; Water policy; Irrigation efficiency; Water demand; Leaching; Water use efficiency; Water supply; Evapotranspiration; Models; Water conservation; Crop Production/Industries; Farm Management; Land Economics/Use; Research and Development/Tech Change/Emerging Technologies. Ano: 1996 URL: http://purl.umn.edu/52730 Irrigation management transfer in the Columbia Basin: lessons and international implications AgEcon Svendsen, Mark; Vermillion, Douglas Lynn. Tipo: Book Palavras-chave: Irrigation management; Farmer managed irrigation systems; Privatization; Irrigation efficiency; Irrigation effects; Project appraisal; Financing; Developing countries; Farm Management; Financial Economics. Ano: 1994 URL: http://purl.umn.edu/114043 Measuring the Impact of the Environmental Quality Incentives Program (EQIP) on Irrigation Efficiency and Water Conservation AgEcon Wallander, Steven; Hand, Michael S.. Since the passage of the 1996 Farm Act, the Environmental Quality Incentives Program (EQIP) has provided over $10 billion in technology adoption subsidies. One of the national conservation priorities in EQIP is water conservation, but it is not known how participation in EQIP by irrigators affects water application rates and decisions to expand or reduce a farm’s irrigated acreage. Using a farm-level panel data set drawn from three national samples of irrigators taken in 1998, 2003, and 2008, this study provides the first national scale econometric estimates of the changes in water application rates and irrigated acreage that result when a farm receives EQIP payments. Due to a five-fold increase in EQIP funding following the 2002 farm bill, the change in... Tipo: Conference Paper or Presentation Palavras-chave: EQIP; Irrigation efficiency; Water conservation; Difference-in-differences; Matching estimator; Environmental Economics and Policy. Ano: 2011 URL: http://purl.umn.edu/103269 Method to evaluate the efficiency of manual overhead irrigation in citrus rootstock liner production REA SALVADOR,CONAN A.; FERRAREZI,RHUANITO S.; BARRETO,CARLOS V. G.; TESTEZLAF,ROBERTO. ABSTRACT Brazil produces grafted citrus seedlings in closed screen houses to reduce pest and disease incidence. Irrigation is usually performed by hand using either breaker nozzles or drilled polyvinyl chloride (PVC) pipe wands on garden hoses. Rootstocks are produced in cone-shaped containers filled with soilless potting mix. Since the containers have a small upper diameter, nutrient solution capture is reduced with the potential to cause environmental contamination from inefficient fertigation. This study provides a method to assess the efficiency of manual overhead irrigation systems used in liner production. The method consists of determining both the volume of water applied and volume lost (i.e., directly and by percolation) in order to obtain an... Tipo: Info:eu-repo/semantics/article Palavras-chave: Citrus propagation; Drainage fraction; Irrigation efficiency; Nursery production. Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000400724 National Conferencs on Water, Food Security and Climate Change in Sri Lanka, Volume 3; Proceeding of the Policies, Institutions and Data Needs for Water Management, BMICH, Colomba June 9-11, 2009 AgEcon Tipo: Presentation Palavras-chave: Water resource management; Water governance; Organizations; Institutions; Water policy; Water rights; Irrigation management; Participatory management; Farmers organizations; Capacity building; Irrigation efficiency; Water demand; Water supply; Irrigation schemes; Operations; Maintenance; Groundwater management; Models; Economic analysis; Food security; Farm Management; Financial Economics; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Industrial Organization; Institutional and Behavioral Economics; Political Economy; Productivity Analysis; Resource /Energy Economics and Policy. Ano: 2010 URL: http://purl.umn.edu/118415 Performance of two transferred modules in the Lagunera Region: Water relations AgEcon Levine, G.; Galvan, A. Cruz; Garcia, D.; Garces-Restrepo, Carlos; Johnson, Sam H., III. Evaluates the degree of success of water users in managing water allocations and deliveries in two irrigation district modules in the Lagunera Region of Mexico. Policies and practices are evaluated from the standpoints of the nature of planning rules, consistency, equity, and efficiency in implementation of the plans. Tipo: Report Palavras-chave: Water policy; Performance; Privatization; Irrigation systems; Operations; Maintenance; Irrigation efficiency; Water users' associations; Water rights; Water allocation; Water supply; Water distribution; Agricultural and Food Policy; Community/Rural/Urban Development; Crop Production/Industries; Farm Management; Land Economics/Use; Productivity Analysis. Ano: 1998 URL: http://purl.umn.edu/44583 Policies drain the North China Plain: Agricultural policy and groundwater depletion in Luancheng County, 1949-2000 AgEcon 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 PREDICTIVE MODELS OF WATER APPLICATION AND DISTRIBUTION EFFICIENCY IN CONVENTIONAL SPRINKLING REA Araújo,Edcássio D.; Santos,Dionei L.; Alvino,Francisco C. G.; Ferreira,Lucas B.; Cunha,Fernando F. da. ABSTRACT Correct determinations of distribution (Ed) and application (EA) efficiencies allow adequate estimations of the gross irrigation depth. This study aimed: i) to determine the distribution efficiency using the Christiansen uniformity coefficient (CUC) in a sprinkler irrigation system under different weather conditions and working pressures; ii) to compare the mean, median, and cumulative CUC values; and iii) to evaluate the predictive capacity of four EA estimation models. CUC values were determined from 80 assessments, as well as the mean, median, and cumulative. The precipitated water depth accumulated in each collector was considered for the accumulated CUC. More uniform evaluations were used for EA (working pressure of 196 kPa), resulting in 20... Tipo: Info:eu-repo/semantics/article Palavras-chave: Uniformity coefficient; Irrigation efficiency; Evaporation and wind drift. Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000100024 Reducing Irrigation Water Demand with Cotton Production in West Texas AgEcon Almas, Lal K.; Colette, W. Arden; Warminski, Patrick L.. Due to declining water availability from the Ogallala Aquifer and increasing pumping costs, irrigation management options for cotton are analyzed. The study concludes that supplemental irrigation while meeting crop ET requirements is the most profitable option. Switching from corn to cotton production may reduce irrigation water demand in the region. Tipo: Conference Paper or Presentation Palavras-chave: Ogallala Aquifer; Irrigated cotton; Irrigation efficiency; Water response function; Input use optimization; ET; Texas Panhandle; Crop Production/Industries; Resource /Energy Economics and Policy. Ano: 2007 URL: http://purl.umn.edu/34848 Strategic Analyses of the National River Linking Project (NRLP) of India, Series 1. India’s water future: scenarios and issues AgEcon Tipo: Book Palavras-chave: River basins; Environmental flows; Development projects; Water requirements; Irrigated farming; Water demand; Food demand Groundwater irrigation; Irrigation efficiency; Water harvesting; Supplemental irrigation; Water productivity; Water conservation; Drip irrigation; Sprinkler irrigation; Rainfed farming; Agricultural policy; Agricultural and Food Policy; Farm Management. Ano: 2009 URL: http://purl.umn.edu/113261 Sustainability in irrigated agriculture AgEcon Svendsen, Mark. Tipo: Working or Discussion Paper Palavras-chave: Irrigated farming; Agriculture; Irrigation efficiency; Sustainability; Agribusiness; Community/Rural/Urban Development; Crop Production/Industries; Farm Management; Food Consumption/Nutrition/Food Safety; Food Security and Poverty. Ano: 1987 URL: http://purl.umn.edu/52782 The transformation of irrigation boards into water user associations in South Africa: Case studies of the Umlaas, Komati, Lomati and Hereford Irrigation Boards Volume 2 AgEcon Faysse, Nicolas; Gumbo, Jabulani. Tipo: Working or Discussion Paper Palavras-chave: Water users’ associations; Organizational development; Institutional development; Water law; Dams; Water users; Forestry; Farmers; Domestic water; History; Water quality; Water allocation; Water rates; Water resource management; Irrigation efficiency; Water use efficiency; Water rights; Canals; Case studies; Farm Management; Institutional and Behavioral Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy. Ano: 2004 URL: http://purl.umn.edu/92784 The Use of Weather Data and Evapotranspiration Requirements to Estimate the Marginal Value Product of Irrigation and the Profit Maximizing Irrigation Level for Corn in the Texas Panhandle AgEcon Colette, W. Arden; Almas, Lal K.; Robinson, Clay. The declining availability of irrigation water from the Ogallala aquifer combined with increasing energy costs make irrigation strategies much more critical. Maximizing yield reduces profit by between $22 and $158 per acre depending on the combination of corn and natural gas prices. Tipo: Conference Paper or Presentation Palavras-chave: Corn; Irrigation efficiency; Water response function; Evapotranspiration; Crop Production/Industries; Land Economics/Use; Research and Development/Tech Change/Emerging Technologies. Ano: 2008 URL: http://purl.umn.edu/6757 Two-dimensional spatial distribution modeling of sprinkler irrigation. Repositório Alice BORGES JÚNIOR, J. C. F.; ANDRADE, C. de L. T. de. Irrigation can provide significant agronomic and financial returns on agricultural activity. The maximization of the benefits obtained from irrigation depends, among other factors, on the water use efficiency, which is intrinsically related to application uniformity. For the sprinkler method, the irrigation uniformity assessment is based on results of labor-intensive field tests in which the two-dimensional water distribution pattern is measured in a grid of catch cans. The aim of this study was to evaluate a simplified methodology for determining the irrigation uniformity using water depth distribution data of a single sprinkler head in operation, positioned at the intersection of two diagonal alignments containing regularly spaced catch cans. Three... Tipo: Artigo de periódico Palavras-chave: Irrigation efficiency; Uniformity coefficient; Coefficient of efficiency; Eficiência de irrigação; Coeficiente de uniformidade; Coeficiente de eficiência; Irrigação; Irrigation. Ano: 2021 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1133925 Water use efficiency and maximizing profitability of grain sorghum production in the Texas Panhandle AgEcon Ahamadou, Aly; Dembele, Mamadou; Almas, Lal K.; Brooks, Kathleen R.. The reduction in the availability of irrigation water and the increase in pumping costs resulting from the decline in the Ogallala Aquifer make good management decisions more critical for the survival of the farm firm and the success of the agricultural sector in the Texas Panhandle. Response functions for irrigation and percentage potential evapotranspiration (PET) in the production of grain sorghum are estimated. The response functions are transferred into value product functions and combined with an irrigation energy cost function to determine the profit maximizing irrigation strategy. Three management decision variables; total water available, the level of irrigation and the water to meet crop ET requirements are evaluated. Grain sorghum yield,... Tipo: Presentation Palavras-chave: Grain sorghum; ET; Maximizing profit; Irrigation efficiency; Input use optimization; Water conservation; Ogallala Aquifer; Texas Panhandle.; Farm Management; Production Economics; Productivity Analysis; Resource /Energy Economics and Policy; Q12; Q15; Q25; Q32; And Q34. Ano: 2012 URL: http://purl.umn.edu/119801 Registros recuperados: 20 Primeira ... 1 ... Última

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