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Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 101
Primeira ... 123456 ... Última
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Alternative N fertilizer management strategies effects on subsurface drain effluent and N uptake NWISRL
Bjorneberg, D.L.; Karlen, D.L.; Kanwar, R.S.; Cambardella, C.A..
Tipo: Article Palavras-chave: Fertilizer; Mass Import - autoclassified (may be erroneous).
Ano: 1998 URL: http://eprints.nwisrl.ars.usda.gov/692/1/960.pdf
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Assessment of Bioaerosols at a Concentrated Dairy Operation. NWISRL
Dungan, R.S.; Leytem, A.B.; Verwey, S.; Bjorneberg, D.L..
Increased bioaerosol loadings in downwind plumes from concentrated animal feeding operations (CAFOs) may increase the risk for allergy and infection in humans. In this study we monitored airborne concentrations of culturable bacteria and fungi at upwind (background) and downwind sites at a 10,000 milking cow dairy over the course of a year. The average bacterial concentrations at the upwind site were 8,400 colony forming units (CFU)/cubic meter and increased to 990,000 CFU/cubic meter at the downwind edge of the cattle pens, decreasing to 63,000 CFU/cubic meter 200 m farther downwind. At the same sites, the average fungal concentrations were 515, 945, and 1010 CFU/cubic meter, respectively. Significant correlations between the ambient weather data and...
Tipo: Article Palavras-chave: Manure Management; Air Emissions; Bioaerosols.
Ano: 2010 URL: http://eprints.nwisrl.ars.usda.gov/1403/1/1373.pdf
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Case Study: On-Farm Evaluation of Liquid Dairy Manure Application Methods to Reduce Ammonia Losses NWISRL
Leytem, A.B.; Bjorneberg, D.L.; Sheffield, R.E.; de Haro Marti, M.E..
The volatilization of NH3 from landapplied manure is not only a loss of valuable N, but also an air quality concern because NH3 plays a role in the formation of airborne particulate matter, which can be a health hazard. The relative differences in potential NH3 losses from land application of liquid dairy manure were determined via 3 methods: surface application, Aerway incorporation (shallow incorporation with a rolling tine aerator), and subsurface injection. Liquid manure was applied at a rate of 190 m3/ha on 4 farms with average N and P application rates ranging from 28 to 130 kg N/ha and 6 to 36 kg P/ha, respectively. Average NH3 concentrations were measured with passive samplers for 3 d after manure application and ranged from 0.03 to 0.21 mg...
Tipo: Article Palavras-chave: Soil; Manure; Animal; Soil quality.
Ano: 2009 URL: http://eprints.nwisrl.ars.usda.gov/1366/1/1343.pdf
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Case Study: Seasonal and Spatial Distribution of Ambient Ammonia Concentrations Measured at a Large Open-Lot Dairy NWISRL
Leytem, A.B.; Dungan, R.S.; Bjorneberg, D.L..
The volatilization of NH3 from dairy production facilities is not only a loss of valuable N, but also an air quality concern because NH3 plays a role in the formation of airborne particulate matter, which can be a health hazard. The ambient NH3 concentrations over several seasons at 3 locations (open lots, compost yard, lagoon) throughout a large openlot dairy were determined, as well as the spatial distribution of NH3 over the open-lot area. There was a significant main effect of location (P < 0.0001), which followed the trend of lot > lagoon = compost > background, with averages of 0.58, 0.33, 0.30, and 0.04 mg NH3/m3, respectively. The effect of weather and lot conditions on the spatial distribution of NH3 across the lots was evident, with...
Tipo: Article Palavras-chave: Manure; Soil; Animal.
Ano: 2009 URL: http://eprints.nwisrl.ars.usda.gov/1367/1/1344.pdf
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Center pivot simulator for evaluating system design and management effects on infiltration and erosion NWISRL
King, B.A.; Bjorneberg, D.L..
A 4-wheeled commercial irrigation boom was modified for use in investigating center pivot design and management effects on infiltration, runoff and erosion of specific soil types. The center pivot simulator used a hydraulic winch attached to the front of a tractor for mobilization and controlled travel speed. A 3 inch diameter 300 ft drag hose is used to supply water to the center pivot simulator. The center pivot simulator was used to conduct two studies to investigate infiltration, runoff and erosion differences of common commercially available center pivot sprinkler types on a Portneuf silt loam soil. Sprinklers used in the first study were: 1) Nelson R3000 with brown plate, 2) Nelson R3000 with red plate, 3) Nelson S3000 with purple plate, and...
Tipo: Conference or Workshop Item Palavras-chave: Erosion; Infiltration; Center pivot; Erosion; Mass Import - autoclassified (may be erroneous).
Ano: 2007 URL: http://eprints.nwisrl.ars.usda.gov/965/1/1236.pdf
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Changes in soil test phosphorus and phosphorus in runoff from calcareous soils receiving manure, compost, and fertilizer application with and without alum NWISRL
Leytem, A.B.; Bjorneberg, D.L..
Tipo: Article Palavras-chave: Calcareous soil; Manure; Phosphorous; Furrow irrigation.
Ano: 2009 URL: http://eprints.nwisrl.ars.usda.gov/1355/3/1332.pdf
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Changes in soil test phosphorus and phosphorus in runoff from calcareous soils receiving manure, compost, and fertilizer application with and without alum NWISRL
Leytem, A.B.; Bjorneberg, D.L..
Intensification of the dairy industry in southern Idaho had led to the over-application of manures and a buildup of soil phosphorus (P) which is a potential threat to water quality in the region. As the use of alum has been shown to reduce both soluble manure P and runoff P from alum treated manures, the objective of this study was to determine if surface applications of alum to dairy manure and compost prior to soil incorporation would reduce P losses under furrow irrigation on a calcareous soil. The effects of manure, compost, and fertilizer application with and without alum treatment on soil P, runoff P and aluminum (Al) under furrow irrigation, crop yield, tissue P concentrations and P removal over a four year period were investigated in Kimberly, ID,...
Tipo: Article Palavras-chave: Manure; Calcareous soil; Phosphorous.
Ano: 2009 URL: http://eprints.nwisrl.ars.usda.gov/1432/1/1332.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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Comparison of atmospheric stability methods for calculating ammonia and methane emission rates with WindTrax NWISRL
Koehn, A.C.; Leytem, A.B.; Bjorneberg, D.L..
Inverse dispersion models are useful tools for estimating emissions from animal feeding operations, waste storage ponds, and manure application fields. Atmospheric stability is an important input parameter to such models. The objective of this study was to compare emission rates calculated with a backward Lagrangian stochastic (bLS) inversedispersion model (WindTrax) using three different methods for calculating atmospheric stability: sonic anemometer, gradient Richardson number, and Pasquill-Gifford (P-G) stability class. Ammonia and methane emission data from a compost yard at a 10,000-cow dairy were used for the comparisons. Overall, average emission rates were not significantly different among the stability methods. Emission rates correlated well...
Tipo: Article Palavras-chave: Air Emissions.
Ano: 2013 URL: http://eprints.nwisrl.ars.usda.gov/1490/1/1454.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 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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Concentrations of Airborne Endotoxin and Microorganisms at a 10,000 Cow Open-Freestall Dairy NWISRL
Dungan, R.S.; Leytem, A.B.; Bjorneberg, D.L..
Confined animal production systems produce elevated bioaerosol concentrations, which are a potential respiratory health risk to individuals on site and downwind. In this study, airborne endotoxin and microorganisms were collected during the spring, summer, and fall at a large open-freestall dairy in southern Idaho. Compared to the background ambient atmosphere, both endotoxin and culturable heterotrophic bacteria concentrations were up to several-hundred fold greater 50 m downwind from the facility, then decreased to near background concentrations at 200 m. However, downwind fungi concentrations were not elevated above background concentrations. At 50 m downwind, the average inhalable endotoxin concentration ranged from 4.6 to 4243 endotoxin units/cubic...
Tipo: Article Palavras-chave: Air Emissions; Manure.
Ano: 2011 URL: http://eprints.nwisrl.ars.usda.gov/1437/1/1404.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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Controlling sprinkler irrigation runoff, erosion, and phosphorus loss with straw and polyacrylamide NWISRL
Bjorneberg, D.L.; Aase, J.K.; Westermann, D.T..
Tipo: Article Palavras-chave: Polyacrylamide; Sraw residue; Nutrients; Sprinkler irrigation; Erosion control; Runoff; Erosion; Mass Import - autoclassified (may be erroneous).
Ano: 2000 URL: http://eprints.nwisrl.ars.usda.gov/115/1/1027.pdf
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Determination of kinetic energy applied by center pivot sprinklers NWISRL
King, B.A.; Bjorneberg, D.L..
Tipo: Conference or Workshop Item Palavras-chave: Center pivot; Infiltration; Sprinkler irrigation.
Ano: 2009 URL: http://eprints.nwisrl.ars.usda.gov/1353/1/1330.pdf
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Droplet Kinetic Energy from Center-Pivot Sprinklers NWISRL
King, B.A.; Bjorneberg, D.L..
The kinetic energy of discrete water 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 the seasonal runoff and erosion hazard. The size and velocity of drops from common rotating spray-plate sprinklers center-pivot sprinklers with flow rates of approximately 40 and 20 L/ min were measured using a laser in the laboratory. The data were used to...
Tipo: Conference or Workshop Item Palavras-chave: Sprinkler irrigation; Center pivot.
Ano: 2010 URL: http://eprints.nwisrl.ars.usda.gov/1426/1/1396.pdf
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Droplet Kinetic Energy of Moving Spray-Plate Center-Pivot Irrigation Sprinklers NWISRL
King, B.A.; Bjorneberg, D.L..
The kinetic energy of discrete water drops impacting a bare soil surface generally leads to a drastic reduction in water infiltration rate due to formation of a seal on the soil surface. 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, especially when the soil is not protected by crop residue cover. Droplet kinetic energy of seven commercial off-center action rotating spray-plate sprinklers was characterized over a range of flow rates and pressures. Sprinkler droplet kinetic energy was characterized using two methods; droplet kinetic energy per unit sprinkler discharge and droplet kinetic energy applied per unit water depth...
Tipo: Article Palavras-chave: Sprinkler irrigation; Center pivot.
Ano: 2012 URL: http://eprints.nwisrl.ars.usda.gov/1457/1/1422.pdf
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Effect of Sprinkler Pressure and Spray Plate on Culturable Microorganism Concentrations During Simulated Irrigation of Dairy Wastewater NWISRL
Dungan, R.S.; Bjorneberg, D.L.; Leytem, A.B..
In this study we conducted simulated spray irrigation events of dairy wastewater to assess the impact of pressure and sprinkler type upon post-sprinkler culturable microorganism concentrations. Dairy wastewater was sampled before and after it was pumped through sprinklers typically used on center pivot irrigation systems. Three different sprinklers types were used at three different operating pressures to give a range of water drop sizes. The microorganisms quantified in this study were total coliforms, Escherichia coli, Clostridium perfringens, heterotrophic bacteria, and coliphage. In most cases the pre- and post-sprinkler concentrations were determined to be statistically similar, suggesting that culturable viability was not affected when wastewater...
Tipo: Article Palavras-chave: Sprinkler irrigation; Manure.
Ano: 2011 URL: http://eprints.nwisrl.ars.usda.gov/1444/1/1409.pdf
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Effects of a new polysaccharide-based amendment on furrow irrigation infiltration and erosion NWISRL
Bjorneberg, D.L.; Sojka, R.E..
Controlling soil erosion on furrow?irrigated fields is essential to maintain productivity and reduce off?site impacts. Identifying effective alternatives to polyacrylamide (PAM) is desired for continued, affordable irrigation erosion control. We compared the effectiveness of a new polysaccharide/PAM amendment with water?soluble, high molecular weight, anionic PAM in two furrow?irrigated field tests in southern Idaho. Test 1 evaluated three rates of the polysaccharide/PAM amendment (6, 12, and 18 mg L-1 of polysaccharide/PAM), two rates of PAM (2 and 10 mg L-1 of PAM), 10 mg L-1 polysaccharide, and a control during two irrigations in a fallow field. Treatments were applied as a solution with furrow inflow water during irrigation advance. Test 1...
Tipo: Article Palavras-chave: Erosion.
Ano: 2008 URL: http://eprints.nwisrl.ars.usda.gov/1284/1/1261.pdf
Registros recuperados: 101
Primeira ... 123456 ... Última
 

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