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Registros recuperados: 14
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Acrylamide monomer leaching from polyacrylamide-treated irrigation furrows NWISRL
Lentz, R.D.; Andrawes, F.F.; Barvenik, F.W.; Koehn, A.C..
Tipo: Article Palavras-chave: Polyacrylamide.
Ano: 2008 URL: http://eprints.nwisrl.ars.usda.gov/1303/1/1280.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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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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Control of white mold of dry beans with foliar sprays in Jerome County, ID, 2004 NWISRL
Strausbaugh, C.A.; Koehn, A.C..
Tipo: Article Palavras-chave: White mold.
Ano: 2005 URL: http://eprints.nwisrl.ars.usda.gov/1216/1/1153.pdf
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Deep percolation and preferential flow under conventionally and PAM-treated irrigation furrows NWISRL
Lentz, R.D.; Westermann, D.T.; Kincaid, D.C.; Koehn, A.C..
Tipo: Conference or Workshop Item Palavras-chave: Percolation water; Polyacrylamide; Percolation water; Mass Import - autoclassified (may be erroneous).
Ano: 2001 URL: http://eprints.nwisrl.ars.usda.gov/890/1/1037.pdf
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Emissions of Ammonia, Methane, Carbon Dioxide and Nitrous Oxide From Dairy Cattle Housing and Manure Management Systems NWISRL
Leytem, A.B.; Dungan, R.S.; Bjorneberg, D.L.; Koehn, A.C..
Concentrated animal feeding operations emit trace gases such as ammonia (NH3), methane (CH4), carbon dioxide (CO2), and nitrous oxide (N2O) to the atmosphere. The implementation of air quality regulations in livestock-producing states increases the need for accurate on-farm determination of emission rates. The objective of this study was to determine the emission rates of NH3, CH4, CO2, and N2O from three source areas (open-lots, lagoon, compost) on a commercial dairy located in southern Idaho. Average emissions per cow per day from the open-lots were 0.12 kg NH3, 0.49 kg CH4, 26.9 kg CO2, and 0.01 kg N2O. Average emissions from the lagoon (g per m square per day) were 1.5 g NH3, 132 g CH4, 391 g CO2, and 0.36 g N2O. Average emissions from the compost...
Tipo: Article Palavras-chave: Manure; Animal; Chemistry.
Ano: 2011 URL: http://eprints.nwisrl.ars.usda.gov/1392/3/1365.pdf
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Greenhouse gas and ammonia emissions from an open-freestall dairy in Southern Idaho NWISRL
Leytem, A.B.; Dungan, R.S.; Bjorneberg, D.L.; Koehn, A.C..
Concentrated dairy operations emit trace gases such as ammonia (NH3), methane (CH4), and nitrous oxide (N2O) to the atmosphere. The implementation of air quality regulations in livestock-producing states increases the need for accurate on-farm determination of emission rates. The objective of this study was to determine the emission rates of NH3, CH4, and N2O from the open-freestall and wastewater pond source areas on a commercial dairy located in southern Idaho. Gas concentrations and wind statistics were measured each month and used with an inverse dispersion model to calculate emission rates. Average emissions per cow per day from the open-freestall source area were 0.10 kg NH3 and 0.47 kg CH4. Average emissions from the wastewater ponds (g m-2 d-1)...
Tipo: Article Palavras-chave: Air Emissions; Animal Production; Manure Management.
Ano: 2013 URL: http://eprints.nwisrl.ars.usda.gov/1501/1/1464.pdf
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Nutrient losses from an irrigated watershed in southern Idaho NWISRL
Bjorneberg, D.L.; Ippolito, J.A.; Koehn, A.C..
Water, sediment and nutrients flowing into and out of the 82,000 ha Twin Falls,ID irrigation tract were measured from 2005 to 2008. Approximately 80% of the water flowing into the watershed was irrigation water diverted from the Snake River. About 40% of the watershed inflow returned to the Snake River. Much of this return flow was water from subsurface drain tiles and tunnels that drain shallow groundwater. Converting from furrow to sprinkler irrigation, improved irrigation management, and constructed sediment ponds have reduced sediment loss from 460 kg/ha in 1971 to <100 kg/ha in 2005. In 2007 and 2008, more sediment and phosphorus entered the watershed than returned to the Snake River. Diverting irrigation water into the watershed removed 6300 Mg of...
Tipo: Conference or Workshop Item Palavras-chave: Irrigation control; Runoff losses; Nutrient losses; Nutrients; Soil.
Ano: 2013 URL: http://eprints.nwisrl.ars.usda.gov/1571/1/1527.pdf
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Pathogenicity and real-time PCR detection of Fusarium spp. in wheat and barley roots NWISRL
Strausbaugh, C.A.; Overturf, K.; Koehn, A.C..
Tipo: Article Palavras-chave: Root rot.
Ano: 2005 URL: http://eprints.nwisrl.ars.usda.gov/19/1/1167.pdf
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Phosphorus losses from an irrigated watershed in the Northwestern U.S.: Case study of the Upper Snake Rock Watershed NWISRL
Bjorneberg, D.L.; Leytem, A.B.; Ippolito, J.A.; Koehn, A.C..
Watersheds utilizing surface water for irrigation often return a portion of the water to a water body. This irrigation return flow often includes sediment and nutrients that reduce the quality of the receiving water body. Research in the 82,000 ha Upper Snake Rock (USR) watershed from 2005 to 2008 showed that, on average, water diverted from the Snake River annually supplied 547 kg/ha of total suspended sediment (TSS), 1.1 kg/ha of total phosphorus (TP) and 0.50 kg/ha of dissolved phosphorus (DP) to the irrigation tract. Irrigation return flow from the USR watershed contributed 414 kg/ha of TSS, 0.71 kg/ha of TP and 0.32 kg/ha of DP back to the Snake River. Significantly more TP flowed into the watershed than returned to the Snake River while there was no...
Tipo: Article Palavras-chave: Irrigation control; Nutrients.
Ano: 2015 URL: http://eprints.nwisrl.ars.usda.gov/1586/1/1543.pdf
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Seed treatments for control of root rots in spring wheat in Bonneville County, ID, 2004 NWISRL
Strausbaugh, C.A.; Koehn, A.C..
Tipo: Article Palavras-chave: Seed treatment; Root rot.
Ano: 2005 URL: http://eprints.nwisrl.ars.usda.gov/1218/1/1155.pdf
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Seed treatments for improved stand and yield in dry beans in Twin Falls County, ID, 2004 NWISRL
Strausbaugh, C.A.; Koehn, A.C..
Tipo: Article Palavras-chave: Seed treatment.
Ano: 2005 URL: http://eprints.nwisrl.ars.usda.gov/1217/1/1154.pdf
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Soil water measurements relevant to agronomic and environmental functions of chemically treated soil NWISRL
Sojka, R.E.; Lehrsch, G.A.; Kostka, S.J.; Reed, J.L.; Koehn, A.C.; Foerster, J.A..
Tipo: Article Palavras-chave: Nutrients; Soil; Water.
Ano: 2009 URL: http://eprints.nwisrl.ars.usda.gov/1349/1/1326.pdf
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Surfactant effects on soil aggregate tensile strength NWISRL
Lehrsch, G.A.; Sojka, R.E.; Koehn, A.C..
Little is known regarding a soil aggregate's tensile strength response to surfactants that may be applied to alleviate soil water repellency. Two laboratory investigations were performed to determine surfactant effects on the tensile strength of 1) Ap horizons of nine wettable, agricultural soils collected from across the continental U.S., and 2) two of the nine soils (Latahco and Rad silt loams from the Pacific Northwest) that were sampled at two depths (5 and 15 mm) after being sprinkler irrigated. Along with an untreated control, three surfactants (an alkyl polyglycoside, an ethylene oxide/propylene oxide block copolymer, and a blend of the two) were spray applied by hand at rates of 0, 1, 1.63, 3.35, 4.79, or 8.14 kg active ingredient ha1 to 1)...
Tipo: Article Palavras-chave: Sprinkler irrigation.
Ano: 2012 URL: http://eprints.nwisrl.ars.usda.gov/1467/1/1432.pdf
Registros recuperados: 14
Primeira ... 1 ... Última
 

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