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Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 103
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A variable flow rate sprinkler for site-specific irrigation management NWISRL
King, B.A.; Kincaid, D.C..
Tipo: Article Palavras-chave: Site-specific irrigation; Sprinkler irrigation; Mass Import - autoclassified (may be erroneous).
Ano: 2004 URL: http://eprints.nwisrl.ars.usda.gov/6/1/1144.pdf
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Aggregate tensile strength and friability characteristics of furrow and sprinkler irrigated fields in Southern Idaho NWISRL
Koehn, A.C.; Lehrsch, G.A.; Busscher, W.J.; Evans, D.E.; King, B.A.; Stieneke, D.L.; Sojka, R.E..
Agricultural crops grown in southern Idaho are furrow or sprinkler irrigated. Therefore, the soil experiences several wetting and drying cycles each growing season that can contribute to changes in aggregate tensile strength and friability. The objective of the research was to evaluate the influence of irrigation on soil structural properties. Four furrow irrigated fields were sampled at the top and bottom of the field, in the furrow and on the bed location of the furrow. Five sprinkler irrigated fields were sampled at 0-5 and 5-15 cm depth and at the top and bottom of the field. Results from this study indicate that differences in tensile strength in furrow irrigated fields were only evident soon after irrigation; otherwise, there were few differences in...
Tipo: Article Palavras-chave: Furrow irrigation; Sprinkler irrigation.
Ano: 2014 URL: http://eprints.nwisrl.ars.usda.gov/1567/1/1523.pdf
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Air Temperature and Vapor Pressure Changes Caused by Sprinkler Irrigation NWISRL
Kohl, R.A.; Wright, J.L..
Tipo: Article Palavras-chave: Sprinkler irrigation; Mass Import - autoclassified (may be erroneous).
Ano: 1974 URL: http://eprints.nwisrl.ars.usda.gov/236/1/251.pdf
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Analise de desempenho da irrigacao. Infoteca-e
SILVA, E. M. da; AZEVEDO, J. A. de; LIMA, J. E. F. W..
bitstream/CPAC-2009/24826/1/doc_70.pdf
Tipo: Documentos (INFOTECA-E) Palavras-chave: Avaliacao; Evaluation; Losses.; Água; Análise Quantitativa; Desperdício; Irrigação por Pivô Central; Irrigação por Aspersão; Irrigação; Modelo Matemático; Performance.; Irrigation; Mathematical models; Quantitative analysis; Sprinkler irrigation; Water..
Ano: 2002 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/559635
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Application Rates and Uniformity of Application from Mechanical-Move Sprinkler Systems NWISRL
Pair, Claude H..
Tipo: Conference or Workshop Item Palavras-chave: Sprinkler irrigation; Mass Import - autoclassified (may be erroneous).
Ano: 1975 URL: http://eprints.nwisrl.ars.usda.gov/996/1/340.pdf
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Application rates from center pivot irrigation with current sprinkler types NWISRL
Kincaid, D.C..
Tipo: Article Palavras-chave: Center pivot; Sprinkler irrigation; Mass Import - autoclassified (may be erroneous).
Ano: 2005 URL: http://eprints.nwisrl.ars.usda.gov/18/1/1165.pdf
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Applying Nitrogen Through Continuously Moving Sprinkler Systems NWISRL
Smith, J. Hamilton; Pair, Claude H.; Douglas, Clyde L..
Tipo: Technical Bulletin Palavras-chave: Sprinkler irrigation; Mass Import - autoclassified (may be erroneous).
Ano: 1969 URL: http://eprints.nwisrl.ars.usda.gov/1150/1/152.pdf
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Aspectos sobre o manejo da irrigacao por aspersao para o cerrado. Infoteca-e
AZEVEDO, J. A. de; SILVA, E. M. da; RESENDE, M.; GUERRA, A. F..
bitstream/item/98824/1/cirtec-16.pdf
Tipo: Circular Técnica (INFOTECA-E) Palavras-chave: Brasil; Management; Região do Cerrado; Uso; Utilização; Utilization.; Água; Aspersão; Cerrado; Equipamento; Irrigação por Aspersão; Irrigação; Manejo; Manejo de Água; Solo.; Brazil; Irrigation; Soil; Soil water; Sprinkler irrigation; Water..
Ano: 1983 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/547730
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Better Sprinkler on Small Research Plots NWISRL
Kohl, R.A.; Pair, C.H.; Massee, T.W..
Tipo: Article Palavras-chave: Sprinkler irrigation; Mass Import - autoclassified (may be erroneous).
Ano: 1969 URL: http://eprints.nwisrl.ars.usda.gov/84/1/150.pdf
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Caracterizacao hidraulica de aspersores. Infoteca-e
PINTO, J. M.; SOARES, J. M..
Este trabalho correspondeu a avaliacao do aspersor DANTAS modelo MD-20A com bocais, 3,1 mm x 2,5mm e 5,6 mm x 2,5mm, com as pressoes de 2, 3, 4 e 5 atm, conduzido no Campo Experimental de Bebedouro, Petrolina, PE. Foi determinada a uniformidade de distribuicao; o coeficiente de uniformidade de Christiansen e a eficiencia de irrigacao. A avaliacao da uniformidade do aspersor envolveu tambem a construcao de isoietas. Determinou-se a rotacao do aspersor, a velocidade e a direcao do vento predominante. Constatou-se que o aspersor modelo MD-20A com bocais 3,1mm x 2,5mm deve ser manejado satisfatoriamente com pressao de 3 atm no espacamento de 12m x 18m com pressao de servico de 5 atm. A rotacao minima (3 rpm) obtida com esse modelo de aspersores, com bocais de...
Tipo: Capítulo em livro técnico (INFOTECA-E) Palavras-chave: Irrigação; Aspersão; Aspersor; Condutividade Hidráulica; Irrigation; Hydraulic conductivity; Sprinkler irrigation.
Ano: 1989 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/132864
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Catch-can performance under a line-source sprinkler NWISRL
Winward, T.W.; Hill, R.W..
A line-source sprinkler configuration provides a linearly decreasing irrigation application rate perpendicular to the sprinkler line and has been utilized to study crop response to variable irrigation amounts. The effect on measured irrigation application depths from using various types of catch-cans in those studies is not known. Derived relationships between crop yield and applied water is dependent on the accuracy of measured catch-can water volumes. The purpose of this study was to evaluate catch-can characteristic effects on measurement of sprinkler irrigation depths in a line source. This was accomplished by evaluating six types of catch-cans: (1) 83 mm diameter polypropylene separatory funnel (with evaporation-suppressing oil), (2) 82 mm...
Tipo: Article Palavras-chave: Sprinkler irrigation; Mass Import - autoclassified (may be erroneous).
Ano: 2007 URL: http://eprints.nwisrl.ars.usda.gov/63/1/1228.pdf
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Center-Pivot Sprinkler Systems NWISRL
Pair, Claude H.; Larsen, Dorrell C.; Kohl, Robert A..
Tipo: Technical Bulletin Palavras-chave: Sprinkler irrigation; Mass Import - autoclassified (may be erroneous).
Ano: 1973 URL: http://eprints.nwisrl.ars.usda.gov/1154/1/258.pdf
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Characterizing droplet kinetic energy applied by moving spray-plate center pivot irrigation sprinklers NWISRL
King, B.A.; Bjorneberg, D.L..
The kinetic energy of discrete drops impacting a bare soil surface is generally observed to lead to a drastic reduction in water infiltration rate due to soil surface seal formation. Under center pivot sprinkler irrigation, kinetic energy transferred to the soil prior to crop canopy development can have a substantial effect on seasonal runoff and soil erosion. In the design of center pivot irrigation systems, selection of sprinklers with minimum applied kinetic energy could potentially minimize seasonal runoff and erosion hazard. Size and velocity of drops from five common center pivot sprinklers with flow rates of approximately 43 L/min were measured using a laser in the laboratory. The data were used to evaluate various approaches to characterize...
Tipo: Article Palavras-chave: Irrigation control; Sprinkler irrigation; Center pivot.
Ano: 2010 URL: http://eprints.nwisrl.ars.usda.gov/1566/1/1522.pdf
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Collector design for measuring high intensity time variant sprinkler application rates NWISRL
King, B.A.; Winward, T.W.; Bjorneberg, D.L.; Wall, R.W..
Peak water application rate in relation to soil water infiltration rate and soil surface storage capacity is important in the design of center pivot sprinkler irrigation systems for efficient irrigation and soil erosion control. Measurement of application rates of center pivot irrigation systems has traditionally used tipping bucket rain gauges. Calculation of application rate from tipping bucket rain gauge measurements restricts computed application rate to a discrete multiple of the rain gauge resolution and time interval. This limits the resolution of application rate measurement, especially for time intervals less than 15 minutes. A collector was designed to measure time variant high intensity sprinkler application rates under field conditions with...
Tipo: Article Palavras-chave: Sprinkler irrigation; Soil; Water.
Ano: 2010 URL: http://eprints.nwisrl.ars.usda.gov/1565/1/1521.pdf
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Community-Type Sprinkler Irrigation Systems NWISRL
Swarner, L.R.; Pair, C.H..
Tipo: Article Palavras-chave: Sprinkler irrigation; Mass Import - autoclassified (may be erroneous).
Ano: 1964 URL: http://eprints.nwisrl.ars.usda.gov/74/1/12.pdf
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Comparison of drop size and velocity measurements by a laser precipitation meter and low-speed photography for an agricultural sprinkler NWISRL
King, B.A.; Winward, T.W.; Bjorneberg, D.L..
Kinetic energy of water droplets has a substantial effect on development of a soil surface seal and infiltration rate of bare soil. Methods for measuring sprinkler droplet size and velocity needed to calculate droplet kinetic energy have been developed and tested over the past 50 years, each with advantages, disadvantages, and limitations. Drop size and velocity of an impact sprinkler at three operating pressures and one nozzle size were measured using a laser precipitation meter and compared with published values obtained using a photographic method. Significant differences in cumulative volume drop size distributions derived from the two measurement methods were found, especially at the highest operating pressure. Significant differences in droplet...
Tipo: Article Palavras-chave: Sprinkler irrigation.
Ano: 2014 URL: http://eprints.nwisrl.ars.usda.gov/1543/1/1500.pdf
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Comparison of Russet Burbank yield and quality under furrow and sprinkler irrigation NWISRL
Trout, T.J.; Kincaid, D.C.; Westermann, D.T..
Tipo: Article Palavras-chave: Sprinkler irrigation; Mass Import - autoclassified (may be erroneous).
Ano: 1994 URL: http://eprints.nwisrl.ars.usda.gov/612/1/829.pdf
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Imprime registro no formato completo
Comparison of sprinkler droplet size and velocity measurements using a laser precipitation meter and photographic method NWISRL
King, B.A.; Winward, T.W.; Bjorneberg, D.L..
Kinetic energy of water droplets has a substantial effect on development of a soil surface seal and infiltration rate of bare soil. Methods for measuring sprinkler droplet size and velocity needed to calculate droplet kinetic energy have been developed and tested over the past 50 years, each with advantages, disadvantages, and limitations. A laser precipitation meter and photographic method were used to measure droplet size and velocity from an impact sprinkler at three pressures and one nozzle size. Significant differences in cumulative volume drop size distributions derived from the two measurement methods were found, especially at the highest operating pressure. Significant differences in droplet velocities were found between measurement methods as...
Tipo: Conference or Workshop Item Palavras-chave: Sprinkler irrigation; Soil water (soil moisture); Water management.
Ano: 2013 URL: http://eprints.nwisrl.ars.usda.gov/1577/1/1533.pdf
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Conservation practice effectiveness in the irrigated Upper Snake/Rock Creek watershed NWISRL
Bjorneberg, D.L.; Westermann, D.T.; Nelson, N.O.; Kendrick, J.H..
The Upper Snake River/Rock Creek Conservation Effects Assessment Project was initiated in 2005 to determine the effectiveness of conservation practices in an irrigated watershed. Our objectives were to determine water and salt balances and water quality effects of using sprinkler rather than furrow irrigation in the Twin Falls irrigation tract in southern Idaho. Data from the current study were compared with earlier studies conducted from 1968 to 1971. Irrigation water diverted from the Snake River supplied 73% and 83% of the hydrologic input to this 82,000 ha (202,000 ac) watershed in 2005 and 2006, respectively, with approximately 40% flowing back to the Snake River through furrow irrigation runoff, unused irrigation water, and subsurface drainage. Net...
Tipo: Article Palavras-chave: Sprinkler irrigation; Furrow irrigation.
Ano: 2008 URL: http://eprints.nwisrl.ars.usda.gov/1324/1/1301.pdf
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Continuously Moving Mechanical Sprinkler Systems NWISRL
Pair, Claude H.; Hinz, Walter W.; Frost, Kenneth R.; Reid, Crawford.
Tipo: Book Section Palavras-chave: Sprinkler irrigation; Mass Import - autoclassified (may be erroneous).
Ano: 1973 URL: http://eprints.nwisrl.ars.usda.gov/750/1/275.pdf
Registros recuperados: 103
Primeira ... 123456 ... Última
 

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