Consulta: subjectFacets:"Irrigation efficiency"
Registros recuperados: 19
Data/hora: 13/06/2024 02:54:09

Method to evaluate the efficiency of manual overhead irrigation in citrus rootstock liner production
Provedor de dados: 70
Autores: 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

PREDICTIVE MODELS OF WATER APPLICATION AND DISTRIBUTION EFFICIENCY IN CONVENTIONAL SPRINKLING
Provedor de dados: 70
Autores: 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

Policies drain the North China Plain: Agricultural policy and groundwater depletion in Luancheng County, 1949-2000
Provedor de dados: 31
Autores: 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

Sustainability in irrigated agriculture
Provedor de dados: 31
Autores: 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

Comparison of Water Allocation Strategies for Wheat Production in the Texas Panhandle
Provedor de dados: 31
Autores: 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

Strategic Analyses of the National River Linking Project (NRLP) of India, Series 1. India’s water future: scenarios and issues
Provedor de dados: 31
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

Governance for Integrated Water Resources Management in a River-Basin Context: Proceedings of a Regional Seminar, Bangkok, May 2002
Provedor de dados: 31
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

Performance of two transferred modules in the Lagunera Region:  Water relations
Provedor de dados: 31
Autores: 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

Integrated water resource systems:  Theory and policy implications
Provedor de dados: 31
Autores: 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
Provedor de dados: 31
Autores: 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

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
Provedor de dados: 31
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

Water use efficiency and maximizing profitability of grain sorghum  production in the Texas Panhandle
Provedor de dados: 31
Autores: 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

Does Efficient Irrigation Technology Lead to Reduced Groundwater Extraction?: Empirical Evidence
Provedor de dados: 31
Autores: 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

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
Provedor de dados: 31
Autores: 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

DOES EFFICIENT WATER MANAGEMENT MATTER? PHYSICAL AND ECONOMIC EFFICIENCY OF WATER USE IN THE RIVER BASIN
Provedor de dados: 31
Autores: 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

Reducing Irrigation Water Demand with Cotton Production in West Texas
Provedor de dados: 31
Autores: 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

Measuring the Impact of the Environmental Quality Incentives Program (EQIP) on Irrigation Efficiency and Water Conservation
Provedor de dados: 31
Autores: 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

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
Provedor de dados: 31
Autores: 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

Agricultural water management in a water stressed catchment: lessons from the RIPARWIN project
Provedor de dados: 31
Autores: 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