|
|
|
|
|
| Massey, M.S.; Davis, J; Ippolito, J.A.; Sheffield, R.E.. |
| Magnesium phosphates such as struvite (MgNH4PO4x6H2O) can be recovered from municipal, industrial and agricultural wastewaters. However, minimal research has been conducted on the beneficial reuse of these recovered products; conducted research has focused on low pH soils. This study determined whether recovered struvite and dittmarite (MgNH4PO4xH2O) were effective P fertilizers in alkaline soils. In addition to commercially available triple superphosphate (TSP) and certified organic rock phosphate (RP), recovered struvite, dittmarite, and a heterogeneous recovered phosphate were evaluated in a laboratory dissolution study and as fertilizers for spring wheat (Triticum aestivum L.) in a greenhouse study. Struvite and dittmarite were much more soluble... |
| Tipo: Article |
Palavras-chave: Chemistry; Fertility; Soil quality; Water. |
| Ano: 2009 |
URL: http://eprints.nwisrl.ars.usda.gov/1576/1/1532.pdf |
| |
|
|
| Massey, M.S.; Ippolito, J.A.; Davis, J.G.; Sheffield, R.E.. |
| Phosphorus (P) recovery and re-use will become increasingly important for water quality protection and sustainable nutrient cycling as environmental regulations become stricter and global P reserves decline. The objective of this study was to examine and characterize several magnesium phosphates recovered from actual wastewater under field conditions. Three types of particles were examined including crystalline magnesium ammonium phosphate hexahydrate (struvite) recovered from dairy wastewater, crystalline magnesium ammonium phosphate hydrate (dittmarite) recovered from a food processing facility, and a heterogeneous product also recovered from dairy wastewater. The particles were analyzed using ‘‘wet” chemical techniques, powder X-ray diffraction... |
| Tipo: Article |
Palavras-chave: Manure; Animal; Chemistry. |
| Ano: 2009 |
URL: http://eprints.nwisrl.ars.usda.gov/1338/1/1315.pdf |
| |
|
| |
|
|
| Leytem, A.B.; Bjorneberg, D.L.; Sheffield, R.E.; de Haro Marti, M.E.. |
| The volatilization of NH3 from landapplied manure is not only a loss of valuable N, but also an air quality concern because NH3 plays a role in the formation of airborne particulate matter, which can be a health hazard. The relative differences in potential NH3 losses from land application of liquid dairy manure were determined via 3 methods: surface application, Aerway incorporation (shallow incorporation with a rolling tine aerator), and subsurface injection. Liquid manure was applied at a rate of 190 m3/ha on 4 farms with average N and P application rates ranging from 28 to 130 kg N/ha and 6 to 36 kg P/ha, respectively. Average NH3 concentrations were measured with passive samplers for 3 d after manure application and ranged from 0.03 to 0.21 mg... |
| Tipo: Article |
Palavras-chave: Soil; Manure; Animal; Soil quality. |
| Ano: 2009 |
URL: http://eprints.nwisrl.ars.usda.gov/1366/1/1343.pdf |
| |
|
|
|
