|
|
|
Registros recuperados: 1,593 | |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
Carter, David L.; Bondurant, James A.. |
The technology available for the control of sediments, nutrients, and adsorbed biocides in surface irrigation return flows has been reviewed and evaluated. Some of this technology could be applied immediately to reduce sediment and associated nutrient and biocide concentrations in surface irrigation return flows. Much of the available information needs to be integrated to develop improved control practices. New ideas and new control technology are needed. Economic incentive programs are needed to improve acceptance of control technology. The factors controlling erosion and subsequent sediment concentrations in surface irrigation return flows, and how these factors can be managed to reduce erosion and sediment concentrations are reviewed and... |
Tipo: Technical Bulletin |
Palavras-chave: Sediment; Mass Import - autoclassified (may be erroneous). |
Ano: 1976 |
URL: http://eprints.nwisrl.ars.usda.gov/1115/1/378.pdf |
| |
|
| |
|
| |
|
| |
|
| |
|
|
Lehrsch, G.A.; Sojka, R.E.; Reed, J.L.; Henderson, R.A.; Kostka, S.J.. |
Surfactants are chemical compounds that change the contact angle of water on solid surfaces and are commonly used to increase infiltration into hydrophobic soil. Since production fields with water-repellent soil often contain areas of wettable soil, surfactants applied to such fields will likely be applied to wettable soil, with unknown consequences for irrigation-induced erosion, runoff, or soil water relations. We evaluated surfactant and simulated sprinkler irrigation effects on these responses for three wettable, Pacific Northwest soils, Latahco and Rad silt loams and Quincy sandy loam. We studied three surfactants: an alkyl polyglycoside in solution at a concentration of 18 g a.i./kg, a block copolymer at 26 g/kg, and... |
Tipo: Article |
Palavras-chave: Sprinkler irrigation. |
Ano: 2011 |
URL: http://eprints.nwisrl.ars.usda.gov/1429/1/1399.pdf |
| |
|
| |
|
| |
|
| |
|
| |
|
|
Robinson, A.R.; Lauritzen, C.W.; Muckel, D.C.; Phelan, Jack. |
An irrigation system should be designed to provide correct distribution, control, and measurement of the irrigation water. Usually a farmer takes his irrigation water from a canal through a headgate. Or he may receive it from a pipeline regulated by a valve, or perhaps from his own well and pump. Open ditches are most commonly used to carry the water to the fields. Water control structures are used to get it out of the ditches and onto the fields. Measurement devices are needed so the farmer can tell how much water he has applied to his field at any irrigation or over the season. Several types of structures are used to divert, convey, control, or measure irrigation water. Some of these are described, and their functions... |
Tipo: Technical Bulletin |
Palavras-chave: Irrigation control; Research methodology; Mass Import - autoclassified (may be erroneous). |
Ano: 1963 |
URL: http://eprints.nwisrl.ars.usda.gov/1140/1/7.pdf |
| |
|
| |
Registros recuperados: 1,593 | |
|
|
|