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| King, Bradley A.; Bjorneberg, D.L.. |
| The marked reduction in infiltration rate caused by formation of a soil surface seal due to water droplet impact on bare soil is a well known phenomenon but is rarely considered in infiltration models, especially under center pivot irrigation. The objective of this study was to develop a soil infiltration model for center pivot sprinkler irrigation that incorporates the transient reduction in soil surface seal hydraulic conductivity as affected by soil and sprinkler characteristics. A sealing soil infiltration model was developed using an explicit finite difference solution scheme with a transient soil seal formation model, which is unique from other studies in that it explicitly uses droplet specific power as the driving factor for formation of a soil... |
| Tipo: Article |
Palavras-chave: Sprinkler irrigation; Infiltration; Center pivot. |
| Ano: 2011 |
URL: http://eprints.nwisrl.ars.usda.gov/1441/1/1407.pdf |
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| King, Bradley A.. |
| Fumigation for nematode management in irrigated potato production systems of Idaho is widely practiced. Spatially uniform fumigation with large scale soil injection equipment is the only labeled application method for 1,3-dichloropropene. Plant-parasitic nematode species exhibit spatially variable population densities that provide an opportunity to practice site-specific fumigation to reduce chemical usage and production costs. From 2002 through 2008, 62 commercial potato fields in eastern Idaho were field tested using geo-referenced grid soil sampling for plant-parasitic nematode population densities. In total, 4,030 grid samples were collected representing nearly 3200 ha of commercial potato production. Collectively, 73% of the grid samples had Columbia... |
| Tipo: Conference or Workshop Item |
Palavras-chave: Potato. |
| Ano: 2010 |
URL: http://eprints.nwisrl.ars.usda.gov/1401/1/1371.pdf |
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| King, Bradley A.; Kincaid, Dennis C.. |
| A good supply of groundwater and the commercial development of center pivot irrigation systems significantly increased sprinkler-irrigated acreage in southern Idaho during the late 1960s and early 1970s. Today, center pivot systems, with their automation, large areal coverage, reliability, high application uniformity, and ability to operate on relatively rough topography, are replacing surface; handline, and wheelline systems. The irrigated area under a center pivot system expands substantially with increasing system length. To accommodate the increased area, the application rate increases linearly along the center pivot lateral through one of two methods: increased flow rates through equally spaced Sprinklers or gradually decreased spacing of... |
| Tipo: Technical Bulletin |
Palavras-chave: Center pivot; Sprinkler irrigation; Mass Import - autoclassified (may be erroneous). |
| Ano: 1997 |
URL: http://eprints.nwisrl.ars.usda.gov/1144/1/977.pdf |
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