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Registros recuperados: 48 | |
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Lentz, R.D.; Kincaid, D.C.. |
Irrigation water supplies are becoming limited, and there is a need to extend the usefulness of current water resources. Previous laboratory studies demonstrated that certain water-soluble polyacrylamide solution (WSPAM) and cross-linked PAM granule (XPAM) treatments effectively reduced infiltration into soils. We evaluated the efficacy of these treatments for reducing water seepage losses in an unlined irrigation reservoir. Five treatments were applied to plots on the lower side slopes of a reservoir basin before it was filled in April 2001: controls; 0.016 kg m -2 WSPAM (1000 mg L -1 solution); 0.2 kg m -2 XPAM + 0.13 kg m -2 NaCl; 0.4 kg m -2 XPAM + 0.13 kg m -2 NaCl; and 0.8 kg m -2 XPAM only. Ring-cylinder seepage meters installed in each experimental... |
Tipo: Article |
Palavras-chave: Water management. |
Ano: 2008 |
URL: http://eprints.nwisrl.ars.usda.gov/1272/1/1249.pdf |
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Lehrsch, G.A.; Lentz, R.D.; Westermann, D.T.; Kincaid, D.C.. |
High water application rates beneath the outer spans of center pivot sprinkler systems can cause runoff, erosion, and nutrient losses, particularly from sloping fields. This study determined runoff, sediment losses, and loads of nutrients (dissolved organic C, Nitrate-N, ammonium-N, total phosphorus [TP], ferric-oxide strip phosphorus [FeO P], dissolved reactive phosphorus [DRP], K, Ca, Mg, and Na) in sprinkler runoff for two years after a single application of either stockpiled or composted dairy manure. The two-year field investigation studied five treatments, including a non-amended control, in each of six blocks, with each block situated under a different span of a moving-lateral sprinkler system. In October 1999, we incorporated 29.1 or 71.7 Mg/ha... |
Tipo: Article |
Palavras-chave: Sprinkler irrigation; Composted manure; Runoff. |
Ano: 2014 |
URL: http://eprints.nwisrl.ars.usda.gov/1559/1/1515.pdf |
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Registros recuperados: 48 | |
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