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| Registros recuperados: 158 | |
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| 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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| Lehrsch, G.A.; Sojka, R.E.. |
| Differences in irrigation water quality may affect the water repellency of soils treated or untreated with surfactants. Using simulated irrigations, we evaluated water quality and surfactant application rate effects upon the water repellency of a Quincy sand (Xeric Torripsamment). We used a split plot design with two irrigation water qualities, three surfactant application rates, two irrigations, and twelve sampling depths as fixed effects, with four replications. Each water quality x rate x irrigation combination was a main plot and depth was a repeated-measures subplot. A slightly water repellent Quincy soil (average water drop penetration time, WDPT, of 2.5 s) was packed in 25-mm lifts (or layers) to a bulk density of 1.6 Mg/cubic m into 0.15-m-high... |
| Tipo: Article |
Palavras-chave: Sprinkler irrigation; Water management. |
| Ano: 2011 |
URL: http://eprints.nwisrl.ars.usda.gov/1430/1/1400.pdf |
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| Lehrsch, G.A.; Lentz, R.D.; Bjorneberg, D.L.; Sojka, R.E.. |
| Soil can be eroded by sprinkler or surface irrigation. Once sprinkler droplet kinetic energy detaches soil, overland flow transports the sediment downslope and off-site. Protecting the soil surface, increasing sprinkler wetted diameters, and tilling to increase infiltration and thereby lessen overland flow are effective control measures. Runoff minimization and management are key to reducing erosion induced by either sprinkler or surface irrigation. Slowing furrow stream velocities with mulch or crop residues reduces the flow’s hydraulic shear and, in turn, detachment of soil from furrow wetted perimeters. Stabilizing surface soil with, for example, polyacrylamide, bio-polymers, or whey keeps soil in place and helps maintains acceptable water quality in... |
| Tipo: Article |
Palavras-chave: Sprinkler irrigation; Erosion; Water management. |
| Ano: 2014 |
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| Stark, J.C.; Love, S.; King, B.A.; Marshall, J.M; Bohl, W.H.; Salaiz, T.. |
| The ability to minimize potato yield and quality losses due to drought can be greatly improved by understanding the relative responses of different cultivars to seasonal variations in water supply. To address this need, we initiated a two year field experiment to determine the responses of the six potato cultivars to different seasonal drought patterns, including 1) full season irrigation at 100% ET, 2) irrigation at 100% ET terminated during late bulking , 3) full season irrigation at 70% ET , 4) irrigation at 70% ET terminated during late bulking , and 5) a gradual reduction in irrigation from 100% ET during tuber initiation through early bulking, to 70% ET during mid-bulking, and 50% ET through late bulking. GemStar Russet and Ranger Russet, two... |
| Tipo: Article |
Palavras-chave: Potato; Water management. |
| Ano: 2013 |
URL: http://eprints.nwisrl.ars.usda.gov/1503/1/1466.pdf |
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| Lehrsch, G.; Sojka, R.; Westermann, D.. |
| Banding and sidedressing nitrogen (N) fertilizer on a never-irrigated side of a row of corn (Zea mays L.) were hypothesized to maintain yield and decrease nitrate leaching. In a two—year ?eld study on a Portneuf silt loam (Durinodic Xeric Haplocalcid) in southern Idaho, we evaluated effects on yield and N uptake of 1) urea placement (broadcast pre-plant vs. band at planting), 2) row spacings (30-in vs. an offset 22—in spacing in which every pair of 22-—in rows was positioned close to a furrow rather than each row on a bed center), and 3) water management. Our water management, termed irrigated furrow positioning, consisted of every- second furrow irrigation in which we applied water to either a) the same or b) the Opposite side of the row with... |
| Tipo: Conference or Workshop Item |
Palavras-chave: Corn / maize; Water management; Mass Import - autoclassified (may be erroneous). |
| Ano: 2008 |
URL: http://eprints.nwisrl.ars.usda.gov/1267/7/1243.pdf |
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| Ippolito, J.A.. |
| Aluminum-based water treatment residuals (Al-WTR) have a strong affinity to sorb phosphorus. In a proof-of-concept greenhouse column study, Al-WTR was surface-applied at 0, 62, 124, and 248 Mg/ha to 15 cm of soil on top of 46 cm of sand; Al-WTR rates were estimated to capture 0, 10, 20, and 40 years of phosphorus from an urban watershed entering an engineered wetland in Boise, Idaho, USA. Creeping red fescue (Festuca rubra) was established in all columns; one set of columns received no Al-WTR or plants. After plant establishment, once per week over a 12-week period, ~1.0 pore volumes of ~0.20 mg phosphorus/L was added to each column. Infiltration rates were measured, leachate was collected and analyzed for soluble phosphorus, and fescue yield,... |
| Tipo: Article |
Palavras-chave: Chemistry; Water management; Water quality. |
| Ano: 2015 |
URL: http://eprints.nwisrl.ars.usda.gov/1605/1/1563.pdf |
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| Tarkalson, D.D.; Eujayl, Imad A.; Beyer, Werner; King, B.A.. |
| Increased water demands and drought have resulted in a need to indentify crop hybrids that are drought tolerant, requiring less irrigation to sustain yields. This study was conducted to assess differences in drought tolerance among a group of genetically diverse sugarbeet hybrids. The study was conducted over three consecutive growing seasons (2008-2010) at the USDA Northwest Irrigation and Soils Research Laboratory in Kimberly, Idaho on a Portneuf silt loam soil (coarse-silty, mixed, superactive, mesic Durinodic Xeric Haplocalcid). Drought tolerance was evaluated by measuring sucrose yield production of six breeding hybrids of Klein Wanzlebener Saatzucht (KWS SAAT AG) and one commercial hybrid (Betaseed Inc.) under six water input treatments. Hybrid... |
| Tipo: Article |
Palavras-chave: Dryland crops; Sugarbeet; Water management. |
| Ano: 2014 |
URL: http://eprints.nwisrl.ars.usda.gov/1578/1/1534.pdf |
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| Lentz, R.D.; Westermann, D.T.. |
| Nutrient losses in furrow irrigation runoff potentially increase when soils are amended with manure. We evaluated the effect of tillage, water soluble polyacrylamide (WSPAM) and irrigation management on runoff water quality during the first furrow irrigation on a calcareous silt loam soil, which had received 45 Mg/ha (dry wt.) dairy manure applied in the fall. In Exp. 1 the amended soil was rototilled and irrigated that fall; furrow inflows were either treated with 10 mg/L WSPAM injected into furrow inflows only during furrow advance (Fall-WSPAM), or were untreated (Fall-Control). In Exp. 2 the first irrigation on the amended soil was delayed until the following spring and treatments included rototilled WSPAM (Spring-WSPAM) and untreated rototilled... |
| Tipo: Article |
Palavras-chave: Water management; Water quality; Furrow irrigation. |
| Ano: 2010 |
URL: http://eprints.nwisrl.ars.usda.gov/1384/1/1359.pdf |
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| Lehrsch, G.A.; Gallian, J.J.. |
| Oilseed radish (Raphanus sativus spp. oleifera) reduces sugarbeet cyst nematode (Heterodera schachtii) populations. Fall-incorporated radish biomass may also increase the yield and quality of subsequently grown sugarbeet (Beta vulgaris L.) by improving soil physical and hydraulic properties. This field study determined radish effects on nearsurface soil aggregate stability, water-stable aggregate size distribution, bulk density, and field-saturated water content, as well as infiltration and hydraulic conductivity measured at water supply potentials of ‑40, ‑20, and +0 mm H2O. In 2003 and 2004 in Twin Falls, ID, radish were grown in a Portneuf silt loam (Durinodic Xeric Haplocalcid) for about 10 weeks in the fall, then incorporated later that fall by... |
| Tipo: Article |
Palavras-chave: Water management; Water. |
| Ano: 2010 |
URL: http://eprints.nwisrl.ars.usda.gov/1381/1/1357.pdf |
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| Lange, G.M.. |
| A Natural Resource Accounting project is currently underway to document the status of the nation’s resources and their current economic use. Accounts for water constitute a major component of the Natural Resource Accounts (NRA) since water is the limiting resource for economic development in Namibia, as it is for much of Southern Africa. The NRA include both stock and use accounts for water, as well as related environmental statistics. In order to design development strategies that are sustainable over the long run, it is essential to know the full value of this scarce resource. This is especially important for a resource like water which is used throughout the economy and must be managed to achieve sometimes conflicting economic, social, and political... |
| Tipo: Report |
Palavras-chave: Water management. |
| Ano: 1997 |
URL: http://hdl.handle.net/1834/694 |
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| 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 |
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| Registros recuperados: 158 | |
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