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| Biswas, S; Kranz, W.L.; Shapiro, C.A.; Mamo, M.; Bartlelt-Hunt, S.L.; Snow, D.D.; Tarkalson, D.D.; Shelton, D.P.; Mader, T.L.; van Donk, Simon J.; Zhang, T.C.. |
| Beef feedlot manure distributed to row crop production areas is a potential surface water contaminant source of the steroid hormones commonly used in beef cattle production. This article reports on research conducted at the University of Nebraska Haskell Agricultural Laboratory near Concord, Nebraska, in July 2009. Manure, collected from beef feedlot pens, was stockpiled for ten months prior to application to a row crop field. Previous research identified that the detection frequency of steroid hormones in beef manure varies greatly. Thus, a surrogate (17 alpha-ethynylestradiol, EE2) was applied at a rate of 75 g per ha to ensure detectable concentrations in surface runoff samples. EE2 was applied directly to beef cattle manure and to bare soil. The EE2... |
| Tipo: Article |
Palavras-chave: Manure Management; Tillage; Soil. |
| Ano: 2013 |
URL: http://eprints.nwisrl.ars.usda.gov/1554/1/1510.pdf |
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| van Donk, Simon J.; Lindgren, Dale T.; Schaaf, Daniel M.; Petersen, J.L.; Tarkalson, D.D.. |
| Wood chip mulches are used in landscapes to reduce soil water evaporation and competition from weeds. A study was conducted over a three-year period to determine soil water content at various depths under four wood chip mulch treatments and to evaluate the effects of wood chip thickness on growth of 'Husker Red' Penstemon digitalis Nutt. plants. The effects of four wood chip thicknesses (depth of application: 0, 2.5, 5, and 10 cm) on soil water content, weed numbers, soil temperature, and height, width, stalk number, and first flower date of 'Husker Red' Penstemon were investigated. The addition of mulch, at all mulch thicknesses, conserved soil water compared to when no mulch was used. The differences in soil water content likely influenced some of the... |
| Tipo: Article |
Palavras-chave: Soil water (soil moisture); Soil. |
| Ano: 2012 |
URL: http://eprints.nwisrl.ars.usda.gov/1456/1/1421.pdf |
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