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Registros recuperados: 41
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Adopting Meteorological Approaches in Irrigation Scheduling for High Rainfall Areas NWISRL
Heermann, Dale F.; Jensen, Marvin E..
Tipo: Conference or Workshop Item Palavras-chave: Irrigation scheduling; Mass Import - autoclassified (may be erroneous).
Ano: 1970 URL: http://eprints.nwisrl.ars.usda.gov/984/1/216.pdf
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An irrigation controller mechanically actuated by soil-water tension: I - Design, development and laboratory evaluations AGRIAMBI
Almeida,Alexsandro C. S.; Botrel,Tarlei A.; Raine,Steven R.; Camargo,Antonio P. de; Pinto,Marinaldo F.; Salvador,Conan A..
ABSTRACT The objective of this study was to develop and evaluate an irrigation controller that was mechanically actuated by soil-water tension within laboratory conditions. The controller was designed and constructed using readily available hydraulic fittings and other componentry. The main components of the controller were a tensiometer; a rubber diaphragm that moves according to the variation in tension inside of the tensiometer; an activation rod that transfers the movement from diaphragm to the switch valve; and a steel spring that regulates the activation of soil water tension. Six irrigation controller samples were tested in the laboratory to evaluate the mechanical performance and component forces required to activate the controllers. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Irrigation scheduling; Tensiometer; Automation.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000600369
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Análise de crescimento do crisântemo de vaso, cultivar Puritan, irrigado em diferentes tensões de água em ambiente protegido - doi: 10.4025/actasciagron.v33i1.1763 Agronomy
Farias, Maryzélia Furtado de; Centro de Ciências Agrárias da Universidade Federal do Maranhão; Saad, João Carlos Cury; Universidade Estadual Paulista.
A irrigação é prática fundamental para o cultivo de crisântemo, porém seu manejo adequado tem sido negligenciado pelos produtores, resultando em prejuízos no crescimento vegetal e conseqüentes decréscimos na produtividade e na qualidade do produto final. Para melhorar a representatividade dos dados obtidos, o experimento foi desenvolvido na propriedade de um produtor tradicional, no Distrito de Holambra II, município de Paranapanema-SP (23°4’S e 49°00’W). O objetivo principal do trabalho foi identificar a tensão de água no substrato (potencial matricial) que resultasse em melhor crescimento e desenvolvimento do crisântemo em vaso, cultivar Puritan. Os tratamentos foram definidos por seis níveis de tensão de água no substrato: -2, -3, -4,-...
Palavras-chave: 5.00.00.00-4 Dendranthema grandiflora; Manejo de água; Tensão de água no substrato 5.01.00.00-9 Dendranthema grandiflora; Irrigation scheduling; Substrate water tension.
Ano: 2011 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1763
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Assessing irrigation performance with comparative indicators: The case of the Alto Rio Lerma Irrigation District, Mexico AgEcon
Kloezen, Wim H.; Garces-Restrepo, Carlos.
Describes and evaluates the application of IWMI's minimum set of performance indicators to the Alto Rio Lerma Irrigation District, and compares this with the application of a small set of process performance indicators.
Tipo: Report Palavras-chave: Irrigation management; Irrigation scheduling; Water allocation; Water distribution; Case studies; Institutional constraints; Operation; Monitoring; Indicators; Performance indexes; Water rights; Economic aspects; Data collection; Environmental effects; Performance evaluation; Water use efficiency; Crop Production/Industries; Institutional and Behavioral Economics; Production Economics.
Ano: 1998 URL: http://purl.umn.edu/44580
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Balancing irrigation and hydropower: Case study from Southern Sri Lanka AgEcon
Molle, Francois; Jayakody, Priyantha; Ariyaratne, Badugodahewa Ranjith; Somatilake, H.S..
This report analyzes a case from southern Sri Lanka, where the Samanalawewa dam and the Kaltota Irrigation Scheme (KIS) compete for the water of the Walawe river. At the catchment level, it is shown that dam releases are well attuned to the needs of KIS and to the occurrences of natural runoff, and that little of the dam water is "lost" to the river.
Tipo: Report Palavras-chave: Reservoirs; Dams; Hydroelectric schemes; Economic analysis; Canals; Irrigation scheduling; Cropping systems; Case studies; Crop Production/Industries; Farm Management; Land Economics/Use.
Ano: 2005 URL: http://purl.umn.edu/44544
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CALIBRATION OF THE HARGREAVES-SAMANI EQUATION FOR SPECIFIC PERIODS OF THE YEAR IN THE MUNICIPALITY OF JAÍBA-MG, BRAZIL Engenharia na Agricultura
Duarte, Anunciene Barbosa; Ferreira, Lucas Borges; dos Santos, Edson Fagne.
Reference evapotranspiration (ET0) explains the climatic effects on crop water demand. The Food and Agriculture Organization (FAO) recommends the Penman Monteith equation as a standard method for estimating ET0. However, because this equation requires a large amount of meteorological data, it has limited application. An alternative is the Hargreaves-Samani (HS) equation, which only requires air temperature data, and can be calibrated to specifc locations and periods. The present study aimed to calibrate the empirical parameters (coeffcients and exponent) of the HS equation for specifc periods of the year, as well as evaluate the behavior and calibration of this equation throughout the year in the municipality of Jaíba-MG, Brazil. The daily meteorological...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Metereologia Agrícola evapotranspiration; Irrigation scheduling; Missing data; Temperature.
Ano: 2017 URL: http://www.seer.ufv.br/seer/index.php/reveng/article/view/838
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Characterization of banana cultivar 'PA 42-44' fruits under regulated irrigation deficit in the North of Minas, Brazil. Repositório Alice
CASTRICINI, A.; COELHO, E. F.; COUTINH0, R. C.; LONDEM L. N..
The use of a suitable irrigation schedule that allows optimal banana growth and fruit quality along with increased water use efficiency is important for waste water reduction.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Musa; Post harvest; Irrigation scheduling.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/907993
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Class A pan coefficients (Kp) to estimate daily reference evapotranspiration (ETo) AGRIAMBI
Sentelhas,Paulo C.; Folegatti,Marcos V..
The class A pan coefficient (Kp) has been used to convert pan evaporation (ECA) to grass-reference evapotranspiration (ETo), an important component in water management of irrigated crops. There are several methods to determine Kp values, using wind speed, relative humidity and fetch length and conditions. This paper analyses the following methods to estimate Kp values: Doorenbos & Pruitt (1977); Cuenca (1989); Snyder (1992); Pereira et al. (1995); Raghuwanshi & Wallender (1998); and FAO/56 (Allen et al., 1998). The estimated values of Kp and the observed Kp, obtained from the relationship between ETo measured in a weighing lysimeter and ECA measured in a class A pan, were compared by regression analysis. The same routine was adopted to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pan coefficient; Irrigation scheduling; Weighing lysimeter.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662003000100018
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Crop yield models adapted to irrigation scheduling programs NWISRL
Hill, R.W.; Hanks, R.J.; Wright, J.L..
Please contact the NWISRL if you have a copy of this publication.
Tipo: Technical Bulletin Palavras-chave: Irrigation scheduling; Research methodology; Mass Import - autoclassified (may be erroneous).
Ano: 1985
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Development and Evaluation of Evapotranspiration Models for Irrigation Scheduling NWISRL
Wright, James L.; Jensen, Marvin E..
Tipo: Article Palavras-chave: Irrigation scheduling; Evapotranspiration; Research methodology; Mass Import - autoclassified (may be erroneous).
Ano: 1978 URL: http://eprints.nwisrl.ars.usda.gov/331/1/393.pdf
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Farmer response to rationed and uncertain irrigation supplies AgEcon
Perry, Christopher J.; Narayanamurthy, S.G..
Explores the theoretical and actual responses of farmers faced with irrigation supplies that are limited in relation to available land and labor resources, and where the actual schedule and available volume for delivery are uncertain.
Tipo: Report Palavras-chave: Water resource management; Water use efficiency; Evapotranspiration; Agricultural production; Irrigated farming; Irrigation scheduling; Water allocation; Water supply; Water scarcity; Water delivery; Reservoirs; Uncertainty; Yield; Crop Production/Industries; Labor and Human Capital; Land Economics/Use.
Ano: 1998 URL: http://purl.umn.edu/44582
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Freqüência de irrigação por gotejamento durante o estádio vegetativo do tomateiro para processamento industrial. Repositório Alice
MAROULELLI, W.A.; SILVA, W.L. de C. e.
Objetivo deste trabalho foi o de estabelecer critério para o manejo de água, durante o estádio vegetativo do tomateiro para processamento industrial, nas condições de cerrado do Brasil Central. Foram avaliados seis turnos de rega entre 0,5 e 16 dias. O estande final e a produtividade de frutos, maximizados em regas a cada 2 dias, apresentaram resposta quadrática com a freqüência de irrigação, enquanto a produção de biomassa foi maximizada em regas diárias. A massa média de fruto e o número de frutos por planta não foram influenciados pelos tratamentos; isto indica que as diferenças de produção foram causadas, principalmente, pela variação do estande final. A profundidade efetiva de raízes apresentou resposta linear positiva com o turno de rega. As plantas...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Lycopersicon sculentum; Estresse hídrico; Manejo da irrigação; Turno de rega; Water stress; Irrigation scheduling; Irrigation interval.
Ano: 2005 URL: http://www.alice.cnptia.embrapa.br/handle/doc/115573
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Fundamentals of smallholder irrigation: the structured system concept AgEcon
Albinson, B.; Perry, Christopher J..
Tipo: Report Palavras-chave: Farmer managed irrigation systems; Irrigation canals; Watercourses; Small scale systems; Irrigation design; Irrigation operation; Irrigation scheduling; Water delivery; Water distribution; Productivity; Equity; Water scarcity; Farm size; Rice; Water conveyance; Hydraulics; Agribusiness; Community/Rural/Urban Development; Crop Production/Industries; Farm Management; Land Economics/Use; Production Economics.
Ano: 2002 URL: http://purl.umn.edu/52964
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Gaseous irrigation control system: descriptions and phisical tests for performance assessment Bragantia
Calbo,Adonai Gimenez; Silva,Washington Luiz de Carvalho e.
Irrigas is a water tension measuring system made out of a porous cup (sensor), connected to a gas pressurizing/measuring device by a flexible tube. Water tension (T) is obtained from the equation T=Td-p or T=Ts-p, where Td is the sensor desorption critical water tension (bubbling beginning), Ts is the sensor sorption critical water tension (bubbling ceasing) and p is the applied gas pressure. Differently from conventional tensiometers, the irrigas porous cup cavity is filled with air. This characteristics makes the irrigas system nearly maintenance free and also eliminates the need of making hydrostatic pressure corrections for sensor depth. The system was tested both in the desorption and sorption modes. In the first case the Richards pressure chamber was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Irrigas; Irrigation scheduling; Porous cup; Tensiometer; Water tension.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052006000300017
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How Scheduling Fits in the Irrigation Program in the Grand Valley of Colorado NWISRL
Boesch, Brice E.; Humpherys, Allan S.; Young, David.
Tipo: Conference or Workshop Item Palavras-chave: Irrigation scheduling; Mass Import - autoclassified (may be erroneous).
Ano: 1981 URL: http://eprints.nwisrl.ars.usda.gov/1024/1/471.pdf
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Infrared thermometry to schedule irrigation of common bean. Repositório Alice
LOBO, F. de A.; OLIVA, M.A.; RESENDE, M.; LOPES, N.F.; MAESTRI, M..
The objective of this work was to determine the critical irrigation time for common bean (Phaseolus vulgaris L. cv. Carioca) using infrared thermometry. Five treatments were analyzed. Canopy temperature differences between plants and a well-watered control about 1, 2, 3, 4, and 5±0.5ºC were tested. Physiological variables and plant growth were analyzed to establish the best time to irrigate. There was a significant linear correlation between the index and stomatal resistance, transpiration rate, and leaf water potential. Although significant linear correlation between the index and mean values of total dry matter, absolute growth rate, and leaf area index was found, no correlation was found with other growth index like relative growth rate, net...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Irrigation scheduling; Water use efficiency; Growth rate; Planejamento da irrigação; Eficácia no uso da água; Taxa de crescimento.
Ano: 2004 URL: http://www.alice.cnptia.embrapa.br/handle/doc/110072
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Infrared thermometry to schedule irrigation of common bean PAB
Lobo,Francisco de Almeida; Oliva,Marco Antonio; Resende,Morethson; Lopes,Nei Fernandes; Maestri,Moacyr.
The objective of this work was to determine the critical irrigation time for common bean (Phaseolus vulgaris L. cv. Carioca) using infrared thermometry. Five treatments were analyzed. Canopy temperature differences between plants and a well-watered control about 1, 2, 3, 4, and 5±0.5ºC were tested. Physiological variables and plant growth were analyzed to establish the best time to irrigate. There was a significant linear correlation between the index and stomatal resistance, transpiration rate, and leaf water potential. Although significant linear correlation between the index and mean values of total dry matter, absolute growth rate, and leaf area index was found, no correlation was found with other growth index like relative growth rate, net...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Irrigation scheduling; Water use efficiency; Growth rate.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2004000200003
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Institutional constraints to conjunctive water management in the Rechna Doab. AgEcon
Jehangir, Waqar Ahmed; Horinkova, Vilma.
Tipo: Working or Discussion Paper Palavras-chave: Water management; Conjunctive use; Groundwater; Surface water; River basins; Institutional development; Organizations; Water law; Legislation; Irrigation scheduling; Conflict; Institutional constraints; Organizational change; Institutional and Behavioral Economics; Resource /Energy Economics and Policy.
Ano: 2002 URL: http://purl.umn.edu/92705
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Institutional perspectives of land reclamation operations in Punjab: A case study of the Lower Chenab Canal (East) Circle Area AgEcon
Bandaragoda, Don Jayatissa; Rehman, Saeed ur.
The Directorate of Land Reclamation (DLR), which was set up in 1945, is a special unit of Punjab's Irrigation and Power Department for undertaking research and field operations to combat the problem of salinity. Approaching the end of five decades of existence, the directorate is yet to demonstrate its effectiveness in its assigned task; its inability to fully cope with the conditions of a fast changing irrigation environment makes this rather an illusive goal. In the selection of lands for reclamation, the Directorate is heavily dependent on the visual salinity survey (Thur Girdawari) carried out every year by the Irrigation Department's field staff. This visual survey appears to be a quick and cost-effective method of assessing surface salinity, but...
Tipo: Working or Discussion Paper Palavras-chave: Land reclamation; Soil salinity; Irrigated sites; Irrigation canals; Irrigation water; Institutions; Legal aspects; Irrigation scheduling; Water availability; Irrigated farming; Case studies; Farm Management; Land Economics/Use.
Ano: 1994 URL: http://purl.umn.edu/113011
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Irrigation controller mechanically actuated by soil-water tension: II - Field evaluations AGRIAMBI
Almeida,Alexsandro C. S.; Botrel,Tarlei A.; Raine,Steven R.; Camargo,Antonio P. de; Pinto,Marinaldo F.; Salvador,Conan A..
ABSTRACT In this study, a field evaluation of the performance of an irrigation controller mechanically actuated by soil-water tension (SWT) was performed. The controller employs a tensiometer used as a sensor of SWT to directly control a mechanically actuated hydraulic valve. Six controllers were installed in an orchard to control the irrigation for six rows of plants over 64 days. Each controller controlled the irrigation of one lateral drip line. The drip irrigation system was gravity-fed from a water source placed 7 m above the soil surface. The SWT and the pressure in each lateral line were measured to evaluate the performance of the controllers. All the controllers tested in the field autonomously initiated and terminated the irrigation during the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Irrigation scheduling; Technological innovation; Tensiometer; Automation.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000500298
Registros recuperados: 41
Primeira ... 123 ... Última
 

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