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| Ippolito, J.A.; Barbarick, K.A.; McDaniel, J.P.; Hansen., N.C.; Peterson, G.A.. |
| Dryland agroecosystems are generally ideal environments for recycling biosolids. However, what is the efficacy of biosolids addition to a no-till dryland management agroecosystem? From 2000 to 2010, we studied application of biosolids from the Littleton/Englewood, CO Wastewater Treatment Plant versus commercial nitrogen fertilizer in dryland no-till wheat (Triticum aestivum, L.)-fallow (WF) and wheat-corn (Zea mays, L.)-fallow (WCF) rotations at a site approximately 50 miles east of Denver, CO. We tested if biosolids would produce the same yields and grain phosphorus, zinc, and barium concentrations as an equivalent rate of nitrogen fertilizer, that biosolids-borne phosphorus, zinc, and barium would not migrate below the 4 inch soil depth, and that... |
| Tipo: Article |
Palavras-chave: Small grain; Dryland crops; Nitrogen; Phosphorous. |
| Ano: 2012 |
URL: http://eprints.nwisrl.ars.usda.gov/1446/1/1411.pdf |
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| Ippolito, J.A.; Barbarick, K.A.; Brobst, R.B.. |
| Predicting trace metal solid phase speciation changes associated with long-term biosolids land application is important for understanding and improving environmental quality. Biosolids were surface-applied (no incorporation; 0, 1, 2, 5, 10, and 15 tons per acre) to a semi-arid grassland in 1991 (single) or again in 2002 (repeated). In July 2003, soils were obtained from the 0-3, 3-6, and 6-12-inch depths in all plots. Using soil pH, soluble anion and cation concentrations from 0.01 moles per liter calcium chloride extractions, and dissolved organic carbon content, copper and zinc associated with minerals, hydrous ferric oxide, or dissolved organic phases was modeled using Visual Minteq. Scanning electron microscopy and energy dispersive x-ray analysis... |
| Tipo: Article |
Palavras-chave: Chemistry; Soil. |
| Ano: 2014 |
URL: http://eprints.nwisrl.ars.usda.gov/1556/1/1512.pdf |
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| Ippolito, J.A.; Barbarick, K.A.; Elliot, H.A.. |
| Coagulants such as alum, [Al2(SO4)3X14H2O], ferric chloride [FeCl3], or ferric sulfate [Fe2(SO4)3] are commonly used to remove particulate and dissolved constituents from water supplies in the production of drinking water. The resulting waste product, called water-treatment residuals (WTR), contains precipitated Al and Fe oxyhydroxides resulting in a strong affinity for anionic species. Recent research has focused on using WTR as cost-effective materials to reduce soluble phosphorus (P) in soils, runoff, and land-applied organic wastes (manures and biosolids). Studies show P adsorption by WTR to be fast and nearly irreversible, suggesting long-term stable immobilization of WTR-bound P. Because excessive WTR application can induce P deficiency in crops,... |
| Tipo: Article |
Palavras-chave: Amendments; Soil; Water management. |
| Ano: 2011 |
URL: http://eprints.nwisrl.ars.usda.gov/1407/1/1377.pdf |
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| Barbarick, K.A.; Ippolito, J.A.; McDaniel, J.P.. |
| Understanding N dynamics in biosolids-amended agroecosystems can help avoid over-application and the potential for environmental degradation. We investigated 15-years of biosolids application to dryland-wheat, questioning what is the relationship between cumulative grain yield and N uptake (N removal) and biosolids or N fertilizer rates and how many times biosolids or N fertilizer are applied? How are wheat-grain production and N uptake intertwined with residual soil nitrate-N? We found that biosolids or N fertilizer rates plus the number of applications of each material produced planar-regression (3-dimensional) models with 15-years of grain yield and N uptake data (all R2 > 0.93). To evaluate how yield or N uptake impacted residual soil nitrate-N, we... |
| Tipo: Article |
Palavras-chave: Dryland crops; Small grain; Nitrogen; Soil quality. |
| Ano: 2010 |
URL: http://eprints.nwisrl.ars.usda.gov/1404/1/1374.pdf |
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| Ippolito, J.A.; Barbarick, K.A.. |
| Organic waste beneficial-use programs effectively recycle plant nutrients when applied at agronomic rates. Plant-nutrient availability, transport, and fate questions have arisen when organic wastes such as biosolids have been applied to dryland agroecosystems. What is the Nfertilizer equivalency of biosolids? What is the N mineralization rate of biosolids over periods of excess moisture or drought, and over long periods of time? Would biosolids, applied at an agronomic N rate for dryland winter wheat (Triticum aestivum L.), oversupply P? If overapplication occurred, what would the repercussions be in terms of excess soil P? Our objectives were to determine: biosolids N fertilizer equivalency; biosolids N mineralization during years of above and below... |
| Tipo: Conference or Workshop Item |
Palavras-chave: Soil; Animal; Phosphorous; Chemistry. |
| Ano: 2010 |
URL: http://eprints.nwisrl.ars.usda.gov/1378/1/1350.pdf |
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